I'm trying to use the cut function to parse filenames, but am encountering difficulty while doing so in a find loop With the intention of converting my music library from ARTIST - TITLE.EXT to TITLE.EXT
So If I had the file X - Y.EXT it should yield Y.EXT as an output.
The current function is something like this:
find . -iname "*.mp3" -exec cut -d "-" -f 2 <<< "`echo {}`" \;
It should be noted that the above syntax looks a bit strange, why not just use <<< {} \; instead of the echo {}. cut seems to parse the file instead of the filename if it's not given a string.
Another attempt I had looked something like:
find . -iname "*.mp3" -exec TRACKTITLE=`echo {} | cut -d '-' -f2` \; -exec echo "$TRACKTITLE" \;
But this fails with find: ‘TRACKTITLE=./DAN TERMINUS - Underwater Cities.mp3’: No such file or directory.
This (cut -d "-" -f 2 <<< FILENAME) command works wonderfully for a single instance (although keeps the space after the "-" character frustratingly).
How can I perform this operation in a find loop?
First thing is try to extract what you want in your file name with Parameter Expansion.
file="ARTIST - TITLE.EXT"
echo "${file#* - }"
Output
TITLE.EXT
Using find and invoking a shell with a for loop.
find . -type f -iname "*.mp3" -exec sh -c 'for music; do echo mv -v "$music" "${music#* - }"; done' sh {} +
If there are .mp3 files in sub directories, just change
-exec
with
-execdir
if available/supported by your find
For whatever reason -execdir is not available.
find . -type f -iname "*.mp3" -exec sh -c '
for music; do
pathname="${music%/*}"
filename="${music##*/}"
new_music="${filename#* - }"
echo mv -v "$music" "$pathname/$new_music"
done' sh {} +
Remove the echo if you're satisfied with the output.
See Understanding -exec option to Find
Below command would say what it would do, remove echo to actually
run mv:
find . -iname "*.mp3" -exec sh -c 'echo mv "$1" "$(echo "$1" | cut -d - -f2)"' sh {} \;
Example output:
$ find . -iname "*.mp3" -exec sh -c 'echo mv "$1" "$(echo "$1" | cut -d - -f2)"' sh {} \;
mv ./X - Y.mp3 Y.mp3
mv ./ARTIST - TITLE.mp3 TITLE.mp3
Also notice that your cut command will leave a whitespace at the
beginning of the new filename:
$ echo ARTIST\ -\ TITLE.mp3 | cut -d - -f2-
TITLE.mp3
You don't need the find nor the cut for this task.
for f in *' - '*.mp3; do mv -i "$f" "${f##* - }"; done
will do the job for the current directory.
If you want to descend through directories, then:
shopt -s globstar
for f in ./**/*' - '*.mp3; do
mv -i "$f" "${f%/*}/${f##* - }"
done
The question is how to combine the following commands in one line and use exec.
find . -name '*.txt' -exec sh -c 'echo "$(sed -n "\$p" "$1"),$1"' _ {} \;
The result: path and name of all .txt files.
find . -name '*.txt' -exec sed -n '/stringA/,/stringB/p' {} \;
The result: lines between start and end parameters over all .txt files.
The requested result: give me lines between start and end parameters. The first line must be contain path and name of the .txt file.
find . -name '*.txt' -exec ???? {} \;
./alpha/file01.txt
stringA
line1
line2
stringB
./beta/file02.txt
stringA
line1
line2
stringB
Thanks.
T.
If the files are non-empty then all you need is:
find . -name '*.txt' -exec awk 'FNR==1{print FILENAME} /StringA/,/StringB/' {} +
If they can be empty then the simplest way to handle it is to use GNU awk for BEGINFILE:
find . -name '*.txt' -exec awk 'BEGINFILE{print FILENAME} /StringA/,/StringB/' {} +
It may be easier to pipe the output of find to other commands than using -exec. Please try the following:
find . -type f -name '*.txt' -print0 | while read -r -d "" f; do echo "$f"; sed -n "/stringA/,/stringB/p" "$f"; done
which yields:
./alpha/file01.txt
stringA
line1
line2
stringB
./beta/file02.txt
stringA
line1
line2
stringB
-print0 option in find merges the filenames delimited by a null character.
-d "" option in read splits the input by a null character to properly reproduce the list of filenames.
Then we can refer to $f as a filename in the while loop.
Hope this helps.
Using GNU sed and realpath:
sed -sn '1F;/stringA/,/stringB/p' $(realpath *.txt)
Or, if relative paths are acceptable:
sed -sn '1F;/stringA/,/stringB/p' ./*.txt
If the code needs to recurse into subdirs:
sed -sn '1F;/stringA/,/stringB/p' $(find . -name '*.txt')
<hello>
<world>dark</world>
</hello>
So far I have tried...
find . -name "*.xml" -print0 | while read -d $'\0' file; do awk '{print "<!--"$0"-->"}' "$file"; done
... which fails.
But some how awk for a single file...
awk '{print "<!--"$0"-->"}' "$file"
... works just fine.
To cover the condition "to find xml files and comment lines containing string 'dark'" exactly:
find + grep + sed solution:
find . -type f -name "*.xml" -exec sh -c \
'if grep -wq "dark" "$1"; then sed -i "s/.*dark.*/<!--&-->/" "$1"; fi' _ {} \;
You'd better not use awk for parsing XML files. Instead use an XML parser.
Here an example with xmllint:
find -name "*.xml" -exec bash -c 'xmllint --xpath "//*/world/text()" $1 >/dev/null 2>&1 && echo $1' _ {} \;
The xpath expression looks for the tag <world> nested in any other tag.
I wrote this command:
find -exec test -e "{}/meta" ";" -exec du -h -t 500M {} ";"
It checks if file meta is in location and if it's whole location bigger than 500MB. Now I want to read first line of this meta file. I tried with this
find -exec test -e "{}/meta" ";" -exec test du -h -t 500M {} ";" -exec sed '1q;d' {}/meta ";"
or this
find -exec test -e "{}/meta" ";" -exec du -h -t 500M {} ";" -exec head -n 1 {}/meta ";"
But it ignores du and read line from every meta file.
How it should looks like?
After a try with find . -type d -size +500M, it appears that the -size option applied to directory does not check its total file size.
Searching for the desired file and checking its directory size should be the better approach:
find . -type f -name 'meta' -execdir bash -c 's=$(du -sh .); [[ "${s%M*}" -gt "500" ]] && sed "1q" meta' \;
I would actually use a while loop in bash for this, like that:
find -type d | \
while IFS= read -r dir; do
if (($(du -ms -- "$dir" | cut -f1) >= 500)); then
[[ -e "$dir/meta" ]] && head -n1 "$dir/meta"
fi
done
I am also not relying on the -t flag of du because it only affects the output, not the status code of `du, so I just use a simple arithmetic comparison in bash instead.
Another approach would be to use -execdir:
find -name meta -type f -execdir bash -c 's=($(du -s .)) ; (( s > 2000 ))' \; -exec head -n1 {} \;
I am trying to use find -exec with multiple commands without any success. Does anybody know if commands such as the following are possible?
find *.txt -exec echo "$(tail -1 '{}'),$(ls '{}')" \;
Basically, I am trying to print the last line of each txt file in the current directory and print at the end of the line, a comma followed by the filename.
find accepts multiple -exec portions to the command. For example:
find . -name "*.txt" -exec echo {} \; -exec grep banana {} \;
Note that in this case the second command will only run if the first one returns successfully, as mentioned by #Caleb. If you want both commands to run regardless of their success or failure, you could use this construct:
find . -name "*.txt" \( -exec echo {} \; -o -exec true \; \) -exec grep banana {} \;
find . -type d -exec sh -c "echo -n {}; echo -n ' x '; echo {}" \;
One of the following:
find *.txt -exec awk 'END {print $0 "," FILENAME}' {} \;
find *.txt -exec sh -c 'echo "$(tail -n 1 "$1"),$1"' _ {} \;
find *.txt -exec sh -c 'echo "$(sed -n "\$p" "$1"),$1"' _ {} \;
Another way is like this:
multiple_cmd() {
tail -n1 $1;
ls $1
};
export -f multiple_cmd;
find *.txt -exec bash -c 'multiple_cmd "$0"' {} \;
in one line
multiple_cmd() { tail -1 $1; ls $1 }; export -f multiple_cmd; find *.txt -exec bash -c 'multiple_cmd "$0"' {} \;
"multiple_cmd()" - is a function
"export -f multiple_cmd" - will export it so any other subshell can see it
"find *.txt -exec bash -c 'multiple_cmd "$0"' {} \;" - find that will execute the function on your example
In this way multiple_cmd can be as long and as complex, as you need.
Hope this helps.
There's an easier way:
find ... | while read -r file; do
echo "look at my $file, my $file is amazing";
done
Alternatively:
while read -r file; do
echo "look at my $file, my $file is amazing";
done <<< "$(find ...)"
Extending #Tinker's answer,
In my case, I needed to make a command | command | command inside the -exec to print both the filename and the found text in files containing a certain text.
I was able to do it with:
find . -name config -type f \( -exec grep "bitbucket" {} \; -a -exec echo {} \; \)
the result is:
url = git#bitbucket.org:a/a.git
./a/.git/config
url = git#bitbucket.org:b/b.git
./b/.git/config
url = git#bitbucket.org:c/c.git
./c/.git/config
I don't know if you can do this with find, but an alternate solution would be to create a shell script and to run this with find.
lastline.sh:
echo $(tail -1 $1),$1
Make the script executable
chmod +x lastline.sh
Use find:
find . -name "*.txt" -exec ./lastline.sh {} \;
Thanks to Camilo Martin, I was able to answer a related question:
What I wanted to do was
find ... -exec zcat {} | wc -l \;
which didn't work. However,
find ... | while read -r file; do echo "$file: `zcat $file | wc -l`"; done
does work, so thank you!
1st answer of Denis is the answer to resolve the trouble. But in fact it is no more a find with several commands in only one exec like the title suggest. To answer the one exec with several commands thing we will have to look for something else to resolv. Here is a example:
Keep last 10000 lines of .log files which has been modified in the last 7 days using 1 exec command using severals {} references
1) see what the command will do on which files:
find / -name "*.log" -a -type f -a -mtime -7 -exec sh -c "echo tail -10000 {} \> fictmp; echo cat fictmp \> {} " \;
2) Do it: (note no more "\>" but only ">" this is wanted)
find / -name "*.log" -a -type f -a -mtime -7 -exec sh -c "tail -10000 {} > fictmp; cat fictmp > {} ; rm fictmp" \;
I usually embed the find in a small for loop one liner, where the find is executed in a subcommand with $().
Your command would look like this then:
for f in $(find *.txt); do echo "$(tail -1 $f), $(ls $f)"; done
The good thing is that instead of {} you just use $f and instead of the -exec … you write all your commands between do and ; done.
Not sure what you actually want to do, but maybe something like this?
for f in $(find *.txt); do echo $f; tail -1 $f; ls -l $f; echo; done
should use xargs :)
find *.txt -type f -exec tail -1 {} \; | xargs -ICONSTANT echo $(pwd),CONSTANT
another one (working on osx)
find *.txt -type f -exec echo ,$(PWD) {} + -exec tail -1 {} + | tr ' ' '/'
A find+xargs answer.
The example below finds all .html files and creates a copy with the .BAK extension appended (e.g. 1.html > 1.html.BAK).
Single command with multiple placeholders
find . -iname "*.html" -print0 | xargs -0 -I {} cp -- "{}" "{}.BAK"
Multiple commands with multiple placeholders
find . -iname "*.html" -print0 | xargs -0 -I {} echo "cp -- {} {}.BAK ; echo {} >> /tmp/log.txt" | sh
# if you need to do anything bash-specific then pipe to bash instead of sh
This command will also work with files that start with a hyphen or contain spaces such as -my file.html thanks to parameter quoting and the -- after cp which signals to cp the end of parameters and the beginning of the actual file names.
-print0 pipes the results with null-byte terminators.
for xargs the -I {} parameter defines {} as the placeholder; you can use whichever placeholder you like; -0 indicates that input items are null-separated.
I found this solution (maybe it is already said in a comment, but I could not find any answer with this)
you can execute MULTIPLE COMMANDS in a row using "bash -c"
find . <SOMETHING> -exec bash -c "EXECUTE 1 && EXECUTE 2 ; EXECUTE 3" \;
in your case
find . -name "*.txt" -exec bash -c "tail -1 '{}' && ls '{}'" \;
i tested it with a test file:
[gek#tuffoserver tmp]$ ls *.txt
casualfile.txt
[gek#tuffoserver tmp]$ find . -name "*.txt" -exec bash -c "tail -1 '{}' && ls '{}'" \;
testonline1=some TEXT
./casualfile.txt
Here is my bash script that you can use to find multiple files and then process them all using a command.
Example of usage. This command applies a file linux command to each found file:
./finder.sh file fb2 txt
Finder script:
# Find files and process them using an external command.
# Usage:
# ./finder.sh ./processing_script.sh txt fb2 fb2.zip doc docx
counter=0
find_results=()
for ext in "${#:2}"
do
# #see https://stackoverflow.com/a/54561526/10452175
readarray -d '' ext_results < <(find . -type f -name "*.${ext}" -print0)
for file in "${ext_results[#]}"
do
counter=$((counter+1))
find_results+=("${file}")
echo ${counter}") ${file}"
done
done
countOfResults=$((counter))
echo -e "Found ${countOfResults} files.\n"
echo "Processing..."
counter=0
for file in "${find_results[#]}"
do
counter=$((counter+1))
echo -n ${counter}"/${countOfResults}) "
eval "$1 '${file}'"
done
echo "All files have been processed."