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I have a lot of files that are named as: MM-DD-YYYY.pdf. I want to rename them as YYYY-MM-DD.pdf I’m sure there is some bash magic to do this. What is it?
For files in the current directory:
for name in ./??-??-????.pdf; do
if [[ "$name" =~ (.*)/([0-9]{2})-([0-9]{2})-([0-9]{4})\.pdf ]]; then
echo mv "$name" "${BASH_REMATCH[1]}/${BASH_REMATCH[4]}-${BASH_REMATCH[3]}-${BASH_REMATCH[2]}.pdf"
fi
done
Recursively, in or under the current directory:
find . -type f -name '??-??-????.pdf' -exec bash -c '
for name do
if [[ "$name" =~ (.*)/([0-9]{2})-([0-9]{2})-([0-9]{4})\.pdf ]]; then
echo mv "$name" "${BASH_REMATCH[1]}/${BASH_REMATCH[4]}-${BASH_REMATCH[3]}-${BASH_REMATCH[2]}.pdf"
fi
done' bash {} +
Enabling the globstar shell option in bash lets us do the following (will also, like the above solution, handle all files in or below the current directory):
shopt -s globstar
for name in **/??-??-????.pdf; do
if [[ "$name" =~ (.*)/([0-9]{2})-([0-9]{2})-([0-9]{4})\.pdf ]]; then
echo mv "$name" "${BASH_REMATCH[1]}/${BASH_REMATCH[4]}-${BASH_REMATCH[3]}-${BASH_REMATCH[2]}.pdf"
fi
done
All three of these solutions uses a regular expression to pick out the relevant parts of the filenames, and then rearranges these parts into the new name. The only difference between them is how the list of pathnames is generated.
The code prefixes mv with echo for safety. To actually rename files, remove the echo (but run at least once with echo to see that it does what you want).
A direct approach example from the command line:
$ ls
10-01-2018.pdf 11-01-2018.pdf 12-01-2018.pdf
$ ls [0-9]*-[0-9]*-[0-9]*.pdf|sed -r 'p;s/([0-9]{2})-([0-9]{2})-([0-9]{4})/\3-\1-\2/'|xargs -n2 mv
$ ls
2018-10-01.pdf 2018-11-01.pdf 2018-12-01.pdf
The ls output is piped to sed , then we use the p flag to print the argument without modifications, in other words, the original name of the file, and s to perform and output the conversion.
The ls + sed result is a combined output that consist of a sequence of old_file_name and new_file_name.
Finally we pipe the resulting feed through xargs to get the effective rename of the files.
From xargs man:
-n number Execute command using as many standard input arguments as possible, up to number arguments maximum.
You can use the following command very close to the one of klashxx:
for f in *.pdf; do echo "$f"; mv "$f" "$(echo "$f" | sed 's#\(..\)-\(..\)-\(....\)#\3-\2-\1#')"; done
before:
ls *.pdf
12-01-1998.pdf 12-03-2018.pdf
after:
ls *.pdf
1998-01-12.pdf 2018-03-12.pdf
Also if you have other pdf files that does not respect this format in your folder, what you can do is to select only the files that respect the format: MM-DD-YYYY.pdf to do so use the following command:
for f in `find . -maxdepth 1 -type f -regextype sed -regex './[0-9]\{2\}-[0-9]\{2\}-[0-9]\{4\}.pdf' | xargs -n1 basename`; do echo "$f"; mv "$f" "$(echo "$f" | sed 's#\(..\)-\(..\)-\(....\)#\3-\2-\1#')"; done
Explanations:
find . -maxdepth 1 -type f -regextype sed -regex './[0-9]\{2\}-[0-9]\{2\}-[0-9]\{4\}.pdf this find command will look only for files in the current working directory that respect your syntax and extract their basename (remove the ./ at the beginning, folders and other type of files that would have the same name are not taken into account, other *.pdf files are also ignored.
for each file you do a move and the resulting file name is computed using sed and back reference to the 3 groups for MM,DD and YYYY
For these simple filenames, using a more verbose pattern, you can simplify the body of the loop a bit:
twodigit=[[:digit:]][[:digit:]]
fourdigit="$twodigit$twodigit"
for f in $twodigit-$twodigit-$fourdigit.pdf; do
IFS=- read month day year <<< "${f%.pdf}"
mv "$f" "$year-$month-$day.pdf"
done
This is basically #Kusalananda's answer, but without the verbosity of regular-expression matching.
I want to go through a bunch of directories and rename all files that end in _test.rb to end in _spec.rb instead. It's something I've never quite figured out how to do with bash so this time I thought I'd put some effort in to get it nailed. I've so far come up short though, my best effort is:
find spec -name "*_test.rb" -exec echo mv {} `echo {} | sed s/test/spec/` \;
NB: there's an extra echo after exec so that the command is printed instead of run while I'm testing it.
When I run it the output for each matched filename is:
mv original original
i.e. the substitution by sed has been lost. What's the trick?
To solve it in a way most close to the original problem would be probably using xargs "args per command line" option:
find . -name "*_test.rb" | sed -e "p;s/test/spec/" | xargs -n2 mv
It finds the files in the current working directory recursively, echoes the original file name (p) and then a modified name (s/test/spec/) and feeds it all to mv in pairs (xargs -n2). Beware that in this case the path itself shouldn't contain a string test.
This happens because sed receives the string {} as input, as can be verified with:
find . -exec echo `echo "{}" | sed 's/./foo/g'` \;
which prints foofoo for each file in the directory, recursively. The reason for this behavior is that the pipeline is executed once, by the shell, when it expands the entire command.
There is no way of quoting the sed pipeline in such a way that find will execute it for every file, since find doesn't execute commands via the shell and has no notion of pipelines or backquotes. The GNU findutils manual explains how to perform a similar task by putting the pipeline in a separate shell script:
#!/bin/sh
echo "$1" | sed 's/_test.rb$/_spec.rb/'
(There may be some perverse way of using sh -c and a ton of quotes to do all this in one command, but I'm not going to try.)
you might want to consider other way like
for file in $(find . -name "*_test.rb")
do
echo mv $file `echo $file | sed s/_test.rb$/_spec.rb/`
done
I find this one shorter
find . -name '*_test.rb' -exec bash -c 'echo mv $0 ${0/test.rb/spec.rb}' {} \;
You can do it without sed, if you want:
for i in `find -name '*_test.rb'` ; do mv $i ${i%%_test.rb}_spec.rb ; done
${var%%suffix} strips suffix from the value of var.
or, to do it using sed:
for i in `find -name '*_test.rb'` ; do mv $i `echo $i | sed 's/test/spec/'` ; done
You mention that you are using bash as your shell, in which case you don't actually need find and sed to achieve the batch renaming you're after...
Assuming you are using bash as your shell:
$ echo $SHELL
/bin/bash
$ _
... and assuming you have enabled the so-called globstar shell option:
$ shopt -p globstar
shopt -s globstar
$ _
... and finally assuming you have installed the rename utility (found in the util-linux-ng package)
$ which rename
/usr/bin/rename
$ _
... then you can achieve the batch renaming in a bash one-liner as follows:
$ rename _test _spec **/*_test.rb
(the globstar shell option will ensure that bash finds all matching *_test.rb files, no matter how deeply they are nested in the directory hierarchy... use help shopt to find out how to set the option)
The easiest way:
find . -name "*_test.rb" | xargs rename s/_test/_spec/
The fastest way (assuming you have 4 processors):
find . -name "*_test.rb" | xargs -P 4 rename s/_test/_spec/
If you have a large number of files to process, it is possible that the list of filenames piped to xargs would cause the resulting command line to exceed the maximum length allowed.
You can check your system's limit using getconf ARG_MAX
On most linux systems you can use free -b or cat /proc/meminfo to find how much RAM you have to work with; Otherwise, use top or your systems activity monitor app.
A safer way (assuming you have 1000000 bytes of ram to work with):
find . -name "*_test.rb" | xargs -s 1000000 rename s/_test/_spec/
Here is what worked for me when the file names had spaces in them. The example below recursively renames all .dar files to .zip files:
find . -name "*.dar" -exec bash -c 'mv "$0" "`echo \"$0\" | sed s/.dar/.zip/`"' {} \;
For this you don't need sed. You can perfectly get alone with a while loop fed with the result of find through a process substitution.
So if you have a find expression that selects the needed files, then use the syntax:
while IFS= read -r file; do
echo "mv $file ${file%_test.rb}_spec.rb" # remove "echo" when OK!
done < <(find -name "*_test.rb")
This will find files and rename all of them striping the string _test.rb from the end and appending _spec.rb.
For this step we use Shell Parameter Expansion where ${var%string} removes the shortest matching pattern "string" from $var.
$ file="HELLOa_test.rbBYE_test.rb"
$ echo "${file%_test.rb}" # remove _test.rb from the end
HELLOa_test.rbBYE
$ echo "${file%_test.rb}_spec.rb" # remove _test.rb and append _spec.rb
HELLOa_test.rbBYE_spec.rb
See an example:
$ tree
.
├── ab_testArb
├── a_test.rb
├── a_test.rb_test.rb
├── b_test.rb
├── c_test.hello
├── c_test.rb
└── mydir
└── d_test.rb
$ while IFS= read -r file; do echo "mv $file ${file/_test.rb/_spec.rb}"; done < <(find -name "*_test.rb")
mv ./b_test.rb ./b_spec.rb
mv ./mydir/d_test.rb ./mydir/d_spec.rb
mv ./a_test.rb ./a_spec.rb
mv ./c_test.rb ./c_spec.rb
if you have Ruby (1.9+)
ruby -e 'Dir["**/*._test.rb"].each{|x|test(?f,x) and File.rename(x,x.gsub(/_test/,"_spec") ) }'
In ramtam's answer which I like, the find portion works OK but the remainder does not if the path has spaces. I am not too familiar with sed, but I was able to modify that answer to:
find . -name "*_test.rb" | perl -pe 's/^((.*_)test.rb)$/"\1" "\2spec.rb"/' | xargs -n2 mv
I really needed a change like this because in my use case the final command looks more like
find . -name "olddir" | perl -pe 's/^((.*)olddir)$/"\1" "\2new directory"/' | xargs -n2 mv
I haven't the heart to do it all over again, but I wrote this in answer to Commandline Find Sed Exec. There the asker wanted to know how to move an entire tree, possibly excluding a directory or two, and rename all files and directories containing the string "OLD" to instead contain "NEW".
Besides describing the how with painstaking verbosity below, this method may also be unique in that it incorporates built-in debugging. It basically doesn't do anything at all as written except compile and save to a variable all commands it believes it should do in order to perform the work requested.
It also explicitly avoids loops as much as possible. Besides the sed recursive search for more than one match of the pattern there is no other recursion as far as I know.
And last, this is entirely null delimited - it doesn't trip on any character in any filename except the null. I don't think you should have that.
By the way, this is REALLY fast. Look:
% _mvnfind() { mv -n "${1}" "${2}" && cd "${2}"
> read -r SED <<SED
> :;s|${3}\(.*/[^/]*${5}\)|${4}\1|;t;:;s|\(${5}.*\)${3}|\1${4}|;t;s|^[0-9]*[\t]\(mv.*\)${5}|\1|p
> SED
> find . -name "*${3}*" -printf "%d\tmv %P ${5} %P\000" |
> sort -zg | sed -nz ${SED} | read -r ${6}
> echo <<EOF
> Prepared commands saved in variable: ${6}
> To view do: printf ${6} | tr "\000" "\n"
> To run do: sh <<EORUN
> $(printf ${6} | tr "\000" "\n")
> EORUN
> EOF
> }
% rm -rf "${UNNECESSARY:=/any/dirs/you/dont/want/moved}"
% time ( _mvnfind ${SRC=./test_tree} ${TGT=./mv_tree} \
> ${OLD=google} ${NEW=replacement_word} ${sed_sep=SsEeDd} \
> ${sh_io:=sh_io} ; printf %b\\000 "${sh_io}" | tr "\000" "\n" \
> | wc - ; echo ${sh_io} | tr "\000" "\n" | tail -n 2 )
<actual process time used:>
0.06s user 0.03s system 106% cpu 0.090 total
<output from wc:>
Lines Words Bytes
115 362 20691 -
<output from tail:>
mv .config/replacement_word-chrome-beta/Default/.../googlestars \
.config/replacement_word-chrome-beta/Default/.../replacement_wordstars
NOTE: The above function will likely require GNU versions of sed and find to properly handle the find printf and sed -z -e and :;recursive regex test;t calls. If these are not available to you the functionality can likely be duplicated with a few minor adjustments.
This should do everything you wanted from start to finish with very little fuss. I did fork with sed, but I was also practicing some sed recursive branching techniques so that's why I'm here. It's kind of like getting a discount haircut at a barber school, I guess. Here's the workflow:
rm -rf ${UNNECESSARY}
I intentionally left out any functional call that might delete or destroy data of any kind. You mention that ./app might be unwanted. Delete it or move it elsewhere beforehand, or, alternatively, you could build in a \( -path PATTERN -exec rm -rf \{\} \) routine to find to do it programmatically, but that one's all yours.
_mvnfind "${#}"
Declare its arguments and call the worker function. ${sh_io} is especially important in that it saves the return from the function. ${sed_sep} comes in a close second; this is an arbitrary string used to reference sed's recursion in the function. If ${sed_sep} is set to a value that could potentially be found in any of your path- or file-names acted upon... well, just don't let it be.
mv -n $1 $2
The whole tree is moved from the beginning. It will save a lot of headache; believe me. The rest of what you want to do - the renaming - is simply a matter of filesystem metadata. If you were, for instance, moving this from one drive to another, or across filesystem boundaries of any kind, you're better off doing so at once with one command. It's also safer. Note the -noclobber option set for mv; as written, this function will not put ${SRC_DIR} where a ${TGT_DIR} already exists.
read -R SED <<HEREDOC
I located all of sed's commands here to save on escaping hassles and read them into a variable to feed to sed below. Explanation below.
find . -name ${OLD} -printf
We begin the find process. With find we search only for anything that needs renaming because we already did all of the place-to-place mv operations with the function's first command. Rather than take any direct action with find, like an exec call, for instance, we instead use it to build out the command-line dynamically with -printf.
%dir-depth :tab: 'mv '%path-to-${SRC}' '${sed_sep}'%path-again :null delimiter:'
After find locates the files we need it directly builds and prints out (most) of the command we'll need to process your renaming. The %dir-depth tacked onto the beginning of each line will help to ensure we're not trying to rename a file or directory in the tree with a parent object that has yet to be renamed. find uses all sorts of optimization techniques to walk your filesystem tree and it is not a sure thing that it will return the data we need in a safe-for-operations order. This is why we next...
sort -general-numerical -zero-delimited
We sort all of find's output based on %directory-depth so that the paths nearest in relationship to ${SRC} are worked first. This avoids possible errors involving mving files into non-existent locations, and it minimizes need to for recursive looping. (in fact, you might be hard-pressed to find a loop at all)
sed -ex :rcrs;srch|(save${sep}*til)${OLD}|\saved${SUBSTNEW}|;til ${OLD=0}
I think this is the only loop in the whole script, and it only loops over the second %Path printed for each string in case it contains more than one ${OLD} value that might need replacing. All other solutions I imagined involved a second sed process, and while a short loop may not be desirable, certainly it beats spawning and forking an entire process.
So basically what sed does here is search for ${sed_sep}, then, having found it, saves it and all characters it encounters until it finds ${OLD}, which it then replaces with ${NEW}. It then heads back to ${sed_sep} and looks again for ${OLD}, in case it occurs more than once in the string. If it is not found, it prints the modified string to stdout (which it then catches again next) and ends the loop.
This avoids having to parse the entire string, and ensures that the first half of the mv command string, which needs to include ${OLD} of course, does include it, and the second half is altered as many times as is necessary to wipe the ${OLD} name from mv's destination path.
sed -ex...-ex search|%dir_depth(save*)${sed_sep}|(only_saved)|out
The two -exec calls here happen without a second fork. In the first, as we've seen, we modify the mv command as supplied by find's -printf function command as necessary to properly alter all references of ${OLD} to ${NEW}, but in order to do so we had to use some arbitrary reference points which should not be included in the final output. So once sed finishes all it needs to do, we instruct it to wipe out its reference points from the hold-buffer before passing it along.
AND NOW WE'RE BACK AROUND
read will receive a command that looks like this:
% mv /path2/$SRC/$OLD_DIR/$OLD_FILE /same/path_w/$NEW_DIR/$NEW_FILE \000
It will read it into ${msg} as ${sh_io} which can be examined at will outside of the function.
Cool.
-Mike
I was able handle filenames with spaces by following the examples suggested by onitake.
This doesn't break if the path contains spaces or the string test:
find . -name "*_test.rb" -print0 | while read -d $'\0' file
do
echo mv "$file" "$(echo $file | sed s/test/spec/)"
done
This is an example that should work in all cases.
Works recursiveley, Need just shell, and support files names with spaces.
find spec -name "*_test.rb" -print0 | while read -d $'\0' file; do mv "$file" "`echo $file | sed s/test/spec/`"; done
$ find spec -name "*_test.rb"
spec/dir2/a_test.rb
spec/dir1/a_test.rb
$ find spec -name "*_test.rb" | xargs -n 1 /usr/bin/perl -e '($new=$ARGV[0]) =~ s/test/spec/; system(qq(mv),qq(-v), $ARGV[0], $new);'
`spec/dir2/a_test.rb' -> `spec/dir2/a_spec.rb'
`spec/dir1/a_test.rb' -> `spec/dir1/a_spec.rb'
$ find spec -name "*_spec.rb"
spec/dir2/b_spec.rb
spec/dir2/a_spec.rb
spec/dir1/a_spec.rb
spec/dir1/c_spec.rb
Your question seems to be about sed, but to accomplish your goal of recursive rename, I'd suggest the following, shamelessly ripped from another answer I gave here:recursive rename in bash
#!/bin/bash
IFS=$'\n'
function RecurseDirs
{
for f in "$#"
do
newf=echo "${f}" | sed -e 's/^(.*_)test.rb$/\1spec.rb/g'
echo "${f}" "${newf}"
mv "${f}" "${newf}"
f="${newf}"
if [[ -d "${f}" ]]; then
cd "${f}"
RecurseDirs $(ls -1 ".")
fi
done
cd ..
}
RecurseDirs .
More secure way of doing rename with find utils and sed regular expression type:
mkdir ~/practice
cd ~/practice
touch classic.txt.txt
touch folk.txt.txt
Remove the ".txt.txt" extension as follows -
cd ~/practice
find . -name "*txt" -execdir sh -c 'mv "$0" `echo "$0" | sed -r 's/\.[[:alnum:]]+\.[[:alnum:]]+$//'`' {} \;
If you use the + in place of ; in order to work on batch mode, the above command will rename only the first matching file, but not the entire list of file matches by 'find'.
find . -name "*txt" -execdir sh -c 'mv "$0" `echo "$0" | sed -r 's/\.[[:alnum:]]+\.[[:alnum:]]+$//'`' {} +
Here's a nice oneliner that does the trick.
Sed can't handle this right, especially if multiple variables are passed by xargs with -n 2.
A bash substition would handle this easily like:
find ./spec -type f -name "*_test.rb" -print0 | xargs -0 -I {} sh -c 'export file={}; mv $file ${file/_test.rb/_spec.rb}'
Adding -type -f will limit the move operations to files only, -print 0 will handle empty spaces in paths.
I share this post as it is a bit related to question. Sorry for not providing more details. Hope it helps someone else.
http://www.peteryu.ca/tutorials/shellscripting/batch_rename
This is my working solution:
for FILE in {{FILE_PATTERN}}; do echo ${FILE} | mv ${FILE} $(sed 's/{{SOURCE_PATTERN}}/{{TARGET_PATTERN}}/g'); done
I want to find all files within the current directory that contain a given string, then print just the 4th line of each file.
grep --null -l "$yourstring" * | # List all the files containing your string
xargs -0 sed -n '4p;q' # Print the fourth line of said files.
Different editions of grep have slightly different incantations of --null, but it's usually there in some form. Read your manpage for details.
Update: I believe one of the null file list incantations of grep is a reasonable solution that will cover the vast majority of real-world use cases, but to be entirely portable, if your version of grep does not support any null output it is not perfectly safe to use it with xargs, so you must resort to find.
find . -maxdepth 1 -type f -exec grep -q "$yourstring" {} \; -exec sed -n '4p;q' {} +
Because find arguments can almost all be used as predicates, the -exec grep -q… part filters the files that are eventually fed to sed down to only those that contain the required string.
From other user:
grep -Frl string . | xargs -n 1 sed -n 4p
Give a try to the below GNU find command,
find . -maxdepth 1 -type f -exec grep -l 'yourstring' {} \; | xargs -I {} awk 'NR==4{print; exit}' {}
It finds all the files in the current directory which contains specific string, and prints the line number 4 present in each file.
This for loop should work:
while read -d '' -r file; do
echo -n "$file: "
sed '4q;d' "$file"
done < <(grep --null -l "some-text" *.txt)
I am using the following command on command line for getting the pattern matched lines.
find . -name "*.gz"|xargs gzcat|grep -e "pattern1" -e "pattern2"
i need now to find only the file names where the pattern is present.
how can i do it on command line?
grel -l has no use since i am using xargs gzcat before grep
Check if you have zgrep available. And then, if yes:
find . -name '*.gz' -exec zgrep -l -e ".." -e ".." {} +
If you don't have it - well, just copy it from some machine that has it (all linuxes I use have it by default) - it's a simple bash script.
ripgrep
Use ripgrep, for example, it's very efficient, especially for large files:
rg -z -e "pattern1" -e "pattern2" *.gz
or:
rg -z "pattern1|pattern2" .
or:
rg -zf pattern.file .
Where pattern.file is a file containing all your patterns separated by a new line character.
-z/--search-zip Search in compressed files (such as gz, bz2, xz, and lzma).
for i in $(find . -name "*.gz"); do gzcat $i|grep -qe "n1" -e "n2" && echo $i; done
Untested; does everything inside find so if you have loads of gz files you wont have performance problems as runs each gzcat/grep as soon as it finds files nothing is piped out:
find . -iname '*.gz' -exec bash -c 'gzcat $1 | grep -q -e "pattern1" -e "pattern2" && echo $1' {} {} \;
In bash, I'd do something like this (untested):
find . -name '*.gz' | while read f ; do gzcat $f | grep -q -e "pattern1" -e "pattern2" && echo $f ; done
grep/zgrep/zegrep
Use zgrep or zegrep to look for pattern in compressed files using their uncompressed contents (both GNU/Linux and BSD/Unix).
On Unix, you can also use grep (which is BSD version) with -Z, including -z on macOS.
Few examples:
zgrep -E -r "pattern1|pattern2|pattern3" .
zegrep "pattern1|pattern2|pattern3" **/*.gz
grep -z -e "pattern1" -e "pattern2" *.gz # BSD/Unix only.
Note: When you've globbing option enabled, ** checks the files recursively, otherwise use -r.
-R/-r/--recursive Recursively search subdirectories listed.
-E/--extended-regexp Interpret pattern as an extended regular expression (like egrep).
-Z (BSD), -z/--decompress (BSD/macOS) Force grep to behave as zgrep.
I want to go through a bunch of directories and rename all files that end in _test.rb to end in _spec.rb instead. It's something I've never quite figured out how to do with bash so this time I thought I'd put some effort in to get it nailed. I've so far come up short though, my best effort is:
find spec -name "*_test.rb" -exec echo mv {} `echo {} | sed s/test/spec/` \;
NB: there's an extra echo after exec so that the command is printed instead of run while I'm testing it.
When I run it the output for each matched filename is:
mv original original
i.e. the substitution by sed has been lost. What's the trick?
To solve it in a way most close to the original problem would be probably using xargs "args per command line" option:
find . -name "*_test.rb" | sed -e "p;s/test/spec/" | xargs -n2 mv
It finds the files in the current working directory recursively, echoes the original file name (p) and then a modified name (s/test/spec/) and feeds it all to mv in pairs (xargs -n2). Beware that in this case the path itself shouldn't contain a string test.
This happens because sed receives the string {} as input, as can be verified with:
find . -exec echo `echo "{}" | sed 's/./foo/g'` \;
which prints foofoo for each file in the directory, recursively. The reason for this behavior is that the pipeline is executed once, by the shell, when it expands the entire command.
There is no way of quoting the sed pipeline in such a way that find will execute it for every file, since find doesn't execute commands via the shell and has no notion of pipelines or backquotes. The GNU findutils manual explains how to perform a similar task by putting the pipeline in a separate shell script:
#!/bin/sh
echo "$1" | sed 's/_test.rb$/_spec.rb/'
(There may be some perverse way of using sh -c and a ton of quotes to do all this in one command, but I'm not going to try.)
you might want to consider other way like
for file in $(find . -name "*_test.rb")
do
echo mv $file `echo $file | sed s/_test.rb$/_spec.rb/`
done
I find this one shorter
find . -name '*_test.rb' -exec bash -c 'echo mv $0 ${0/test.rb/spec.rb}' {} \;
You can do it without sed, if you want:
for i in `find -name '*_test.rb'` ; do mv $i ${i%%_test.rb}_spec.rb ; done
${var%%suffix} strips suffix from the value of var.
or, to do it using sed:
for i in `find -name '*_test.rb'` ; do mv $i `echo $i | sed 's/test/spec/'` ; done
You mention that you are using bash as your shell, in which case you don't actually need find and sed to achieve the batch renaming you're after...
Assuming you are using bash as your shell:
$ echo $SHELL
/bin/bash
$ _
... and assuming you have enabled the so-called globstar shell option:
$ shopt -p globstar
shopt -s globstar
$ _
... and finally assuming you have installed the rename utility (found in the util-linux-ng package)
$ which rename
/usr/bin/rename
$ _
... then you can achieve the batch renaming in a bash one-liner as follows:
$ rename _test _spec **/*_test.rb
(the globstar shell option will ensure that bash finds all matching *_test.rb files, no matter how deeply they are nested in the directory hierarchy... use help shopt to find out how to set the option)
The easiest way:
find . -name "*_test.rb" | xargs rename s/_test/_spec/
The fastest way (assuming you have 4 processors):
find . -name "*_test.rb" | xargs -P 4 rename s/_test/_spec/
If you have a large number of files to process, it is possible that the list of filenames piped to xargs would cause the resulting command line to exceed the maximum length allowed.
You can check your system's limit using getconf ARG_MAX
On most linux systems you can use free -b or cat /proc/meminfo to find how much RAM you have to work with; Otherwise, use top or your systems activity monitor app.
A safer way (assuming you have 1000000 bytes of ram to work with):
find . -name "*_test.rb" | xargs -s 1000000 rename s/_test/_spec/
Here is what worked for me when the file names had spaces in them. The example below recursively renames all .dar files to .zip files:
find . -name "*.dar" -exec bash -c 'mv "$0" "`echo \"$0\" | sed s/.dar/.zip/`"' {} \;
For this you don't need sed. You can perfectly get alone with a while loop fed with the result of find through a process substitution.
So if you have a find expression that selects the needed files, then use the syntax:
while IFS= read -r file; do
echo "mv $file ${file%_test.rb}_spec.rb" # remove "echo" when OK!
done < <(find -name "*_test.rb")
This will find files and rename all of them striping the string _test.rb from the end and appending _spec.rb.
For this step we use Shell Parameter Expansion where ${var%string} removes the shortest matching pattern "string" from $var.
$ file="HELLOa_test.rbBYE_test.rb"
$ echo "${file%_test.rb}" # remove _test.rb from the end
HELLOa_test.rbBYE
$ echo "${file%_test.rb}_spec.rb" # remove _test.rb and append _spec.rb
HELLOa_test.rbBYE_spec.rb
See an example:
$ tree
.
├── ab_testArb
├── a_test.rb
├── a_test.rb_test.rb
├── b_test.rb
├── c_test.hello
├── c_test.rb
└── mydir
└── d_test.rb
$ while IFS= read -r file; do echo "mv $file ${file/_test.rb/_spec.rb}"; done < <(find -name "*_test.rb")
mv ./b_test.rb ./b_spec.rb
mv ./mydir/d_test.rb ./mydir/d_spec.rb
mv ./a_test.rb ./a_spec.rb
mv ./c_test.rb ./c_spec.rb
if you have Ruby (1.9+)
ruby -e 'Dir["**/*._test.rb"].each{|x|test(?f,x) and File.rename(x,x.gsub(/_test/,"_spec") ) }'
In ramtam's answer which I like, the find portion works OK but the remainder does not if the path has spaces. I am not too familiar with sed, but I was able to modify that answer to:
find . -name "*_test.rb" | perl -pe 's/^((.*_)test.rb)$/"\1" "\2spec.rb"/' | xargs -n2 mv
I really needed a change like this because in my use case the final command looks more like
find . -name "olddir" | perl -pe 's/^((.*)olddir)$/"\1" "\2new directory"/' | xargs -n2 mv
I haven't the heart to do it all over again, but I wrote this in answer to Commandline Find Sed Exec. There the asker wanted to know how to move an entire tree, possibly excluding a directory or two, and rename all files and directories containing the string "OLD" to instead contain "NEW".
Besides describing the how with painstaking verbosity below, this method may also be unique in that it incorporates built-in debugging. It basically doesn't do anything at all as written except compile and save to a variable all commands it believes it should do in order to perform the work requested.
It also explicitly avoids loops as much as possible. Besides the sed recursive search for more than one match of the pattern there is no other recursion as far as I know.
And last, this is entirely null delimited - it doesn't trip on any character in any filename except the null. I don't think you should have that.
By the way, this is REALLY fast. Look:
% _mvnfind() { mv -n "${1}" "${2}" && cd "${2}"
> read -r SED <<SED
> :;s|${3}\(.*/[^/]*${5}\)|${4}\1|;t;:;s|\(${5}.*\)${3}|\1${4}|;t;s|^[0-9]*[\t]\(mv.*\)${5}|\1|p
> SED
> find . -name "*${3}*" -printf "%d\tmv %P ${5} %P\000" |
> sort -zg | sed -nz ${SED} | read -r ${6}
> echo <<EOF
> Prepared commands saved in variable: ${6}
> To view do: printf ${6} | tr "\000" "\n"
> To run do: sh <<EORUN
> $(printf ${6} | tr "\000" "\n")
> EORUN
> EOF
> }
% rm -rf "${UNNECESSARY:=/any/dirs/you/dont/want/moved}"
% time ( _mvnfind ${SRC=./test_tree} ${TGT=./mv_tree} \
> ${OLD=google} ${NEW=replacement_word} ${sed_sep=SsEeDd} \
> ${sh_io:=sh_io} ; printf %b\\000 "${sh_io}" | tr "\000" "\n" \
> | wc - ; echo ${sh_io} | tr "\000" "\n" | tail -n 2 )
<actual process time used:>
0.06s user 0.03s system 106% cpu 0.090 total
<output from wc:>
Lines Words Bytes
115 362 20691 -
<output from tail:>
mv .config/replacement_word-chrome-beta/Default/.../googlestars \
.config/replacement_word-chrome-beta/Default/.../replacement_wordstars
NOTE: The above function will likely require GNU versions of sed and find to properly handle the find printf and sed -z -e and :;recursive regex test;t calls. If these are not available to you the functionality can likely be duplicated with a few minor adjustments.
This should do everything you wanted from start to finish with very little fuss. I did fork with sed, but I was also practicing some sed recursive branching techniques so that's why I'm here. It's kind of like getting a discount haircut at a barber school, I guess. Here's the workflow:
rm -rf ${UNNECESSARY}
I intentionally left out any functional call that might delete or destroy data of any kind. You mention that ./app might be unwanted. Delete it or move it elsewhere beforehand, or, alternatively, you could build in a \( -path PATTERN -exec rm -rf \{\} \) routine to find to do it programmatically, but that one's all yours.
_mvnfind "${#}"
Declare its arguments and call the worker function. ${sh_io} is especially important in that it saves the return from the function. ${sed_sep} comes in a close second; this is an arbitrary string used to reference sed's recursion in the function. If ${sed_sep} is set to a value that could potentially be found in any of your path- or file-names acted upon... well, just don't let it be.
mv -n $1 $2
The whole tree is moved from the beginning. It will save a lot of headache; believe me. The rest of what you want to do - the renaming - is simply a matter of filesystem metadata. If you were, for instance, moving this from one drive to another, or across filesystem boundaries of any kind, you're better off doing so at once with one command. It's also safer. Note the -noclobber option set for mv; as written, this function will not put ${SRC_DIR} where a ${TGT_DIR} already exists.
read -R SED <<HEREDOC
I located all of sed's commands here to save on escaping hassles and read them into a variable to feed to sed below. Explanation below.
find . -name ${OLD} -printf
We begin the find process. With find we search only for anything that needs renaming because we already did all of the place-to-place mv operations with the function's first command. Rather than take any direct action with find, like an exec call, for instance, we instead use it to build out the command-line dynamically with -printf.
%dir-depth :tab: 'mv '%path-to-${SRC}' '${sed_sep}'%path-again :null delimiter:'
After find locates the files we need it directly builds and prints out (most) of the command we'll need to process your renaming. The %dir-depth tacked onto the beginning of each line will help to ensure we're not trying to rename a file or directory in the tree with a parent object that has yet to be renamed. find uses all sorts of optimization techniques to walk your filesystem tree and it is not a sure thing that it will return the data we need in a safe-for-operations order. This is why we next...
sort -general-numerical -zero-delimited
We sort all of find's output based on %directory-depth so that the paths nearest in relationship to ${SRC} are worked first. This avoids possible errors involving mving files into non-existent locations, and it minimizes need to for recursive looping. (in fact, you might be hard-pressed to find a loop at all)
sed -ex :rcrs;srch|(save${sep}*til)${OLD}|\saved${SUBSTNEW}|;til ${OLD=0}
I think this is the only loop in the whole script, and it only loops over the second %Path printed for each string in case it contains more than one ${OLD} value that might need replacing. All other solutions I imagined involved a second sed process, and while a short loop may not be desirable, certainly it beats spawning and forking an entire process.
So basically what sed does here is search for ${sed_sep}, then, having found it, saves it and all characters it encounters until it finds ${OLD}, which it then replaces with ${NEW}. It then heads back to ${sed_sep} and looks again for ${OLD}, in case it occurs more than once in the string. If it is not found, it prints the modified string to stdout (which it then catches again next) and ends the loop.
This avoids having to parse the entire string, and ensures that the first half of the mv command string, which needs to include ${OLD} of course, does include it, and the second half is altered as many times as is necessary to wipe the ${OLD} name from mv's destination path.
sed -ex...-ex search|%dir_depth(save*)${sed_sep}|(only_saved)|out
The two -exec calls here happen without a second fork. In the first, as we've seen, we modify the mv command as supplied by find's -printf function command as necessary to properly alter all references of ${OLD} to ${NEW}, but in order to do so we had to use some arbitrary reference points which should not be included in the final output. So once sed finishes all it needs to do, we instruct it to wipe out its reference points from the hold-buffer before passing it along.
AND NOW WE'RE BACK AROUND
read will receive a command that looks like this:
% mv /path2/$SRC/$OLD_DIR/$OLD_FILE /same/path_w/$NEW_DIR/$NEW_FILE \000
It will read it into ${msg} as ${sh_io} which can be examined at will outside of the function.
Cool.
-Mike
I was able handle filenames with spaces by following the examples suggested by onitake.
This doesn't break if the path contains spaces or the string test:
find . -name "*_test.rb" -print0 | while read -d $'\0' file
do
echo mv "$file" "$(echo $file | sed s/test/spec/)"
done
This is an example that should work in all cases.
Works recursiveley, Need just shell, and support files names with spaces.
find spec -name "*_test.rb" -print0 | while read -d $'\0' file; do mv "$file" "`echo $file | sed s/test/spec/`"; done
$ find spec -name "*_test.rb"
spec/dir2/a_test.rb
spec/dir1/a_test.rb
$ find spec -name "*_test.rb" | xargs -n 1 /usr/bin/perl -e '($new=$ARGV[0]) =~ s/test/spec/; system(qq(mv),qq(-v), $ARGV[0], $new);'
`spec/dir2/a_test.rb' -> `spec/dir2/a_spec.rb'
`spec/dir1/a_test.rb' -> `spec/dir1/a_spec.rb'
$ find spec -name "*_spec.rb"
spec/dir2/b_spec.rb
spec/dir2/a_spec.rb
spec/dir1/a_spec.rb
spec/dir1/c_spec.rb
Your question seems to be about sed, but to accomplish your goal of recursive rename, I'd suggest the following, shamelessly ripped from another answer I gave here:recursive rename in bash
#!/bin/bash
IFS=$'\n'
function RecurseDirs
{
for f in "$#"
do
newf=echo "${f}" | sed -e 's/^(.*_)test.rb$/\1spec.rb/g'
echo "${f}" "${newf}"
mv "${f}" "${newf}"
f="${newf}"
if [[ -d "${f}" ]]; then
cd "${f}"
RecurseDirs $(ls -1 ".")
fi
done
cd ..
}
RecurseDirs .
More secure way of doing rename with find utils and sed regular expression type:
mkdir ~/practice
cd ~/practice
touch classic.txt.txt
touch folk.txt.txt
Remove the ".txt.txt" extension as follows -
cd ~/practice
find . -name "*txt" -execdir sh -c 'mv "$0" `echo "$0" | sed -r 's/\.[[:alnum:]]+\.[[:alnum:]]+$//'`' {} \;
If you use the + in place of ; in order to work on batch mode, the above command will rename only the first matching file, but not the entire list of file matches by 'find'.
find . -name "*txt" -execdir sh -c 'mv "$0" `echo "$0" | sed -r 's/\.[[:alnum:]]+\.[[:alnum:]]+$//'`' {} +
Here's a nice oneliner that does the trick.
Sed can't handle this right, especially if multiple variables are passed by xargs with -n 2.
A bash substition would handle this easily like:
find ./spec -type f -name "*_test.rb" -print0 | xargs -0 -I {} sh -c 'export file={}; mv $file ${file/_test.rb/_spec.rb}'
Adding -type -f will limit the move operations to files only, -print 0 will handle empty spaces in paths.
I share this post as it is a bit related to question. Sorry for not providing more details. Hope it helps someone else.
http://www.peteryu.ca/tutorials/shellscripting/batch_rename
This is my working solution:
for FILE in {{FILE_PATTERN}}; do echo ${FILE} | mv ${FILE} $(sed 's/{{SOURCE_PATTERN}}/{{TARGET_PATTERN}}/g'); done