I'm writing a script
One goal of the script is to append a new codeline after a match, with foo, in multiple .yml files recursively.
# Append new line after match in multiple files with sed
## sed -i -se "s/\foo/bar/g" *.yml
grep -rl foo * .| xargs sed -i -e "s/\foo/a bar/g" *.yml
I expected after every match with foo, because of /a, bar would be added on a new line in all .yml files.
I get unexpected Sed outpout:
sed: can't read *.yml: No such file or directory
Details:
OS: Debian GNU/Linux 10
sed --version: sed (GNU sed) 4.7
You're supplying the filename arguments with xargs. You shouldn't also use *.yml as an argument. The shell will expand that to the .yml files in the current directory, and you'll get an error if there aren't any.
If you want grep -r to only examine .yml files, use the --include option.
grep -rl --include='*.yml' foo . | xargs sed -i -e "s/foo/a bar/g"
Note that the s command isn't used for appending a new line after a line. It's used for substituting within the same line. s/foo/ a bar/g replaces all the foo on the line with a bar. If you want to append, get rid of the s command. Also, you don't put /g at the end of the a command.
grep -rl --include='*.yml' foo . | xargs sed -i -e "/foo/a bar"
See How to insert text after a certain string in a file?
Related
I need to use sed instead of echo and append to the end of a file: list.txt
list.txt has a list of directories:
/desktop/test1/file1
/desktop/test2/file1
I need to append another directory with slashes to this list.txt at the end of the file if that directory already doesn't exist in the list. Such as: /desktop/file1
The result should be:
/desktop/test1/file1
/desktop/test2/file1
/desktop/file1
I've tried using this script but am running into syntax errors with the a command which I've been seeing could be a mac issue?:
#!/bin/bash
if ! grep -q "/desktop/file1" user/admin/Desktop/list.txt; then
sed -i -e '$a/desktop/file1' user/admin/Desktop/list.txt
fi
The a command is used as a\ in standard sed and should be followed by a newline and the text to be written. The form you use is a GNU extension. So a standard sed command to do the job could be:
sed -i '' '$a\
/desktop/file1' user/admin/Desktop/list.txt
or
sed -i '' '$a\'$'\n''/desktop/file1' user/admin/Desktop/list.txt
using ANSI-C quoting in bash.
I can remove the first line of csv file's starting with myfile and merge them using:
sed 1d myfile*.csv > myfile_merged.csv
I'd like to also remove the last line of the csv files.
I've tried:
sed 1d -i '$d' myfile*.csv > myfile_merged.csv
But get the error:
sed: can't read $d: No such file or directory
Problem is this command:
sed 1d -i '$d' myfile*.csv > myfile_merged.csv
You need not have an argument after -i (inline replacement) in sed otherwise it is treated as a SUFFIX to create a backup for inline replacement.
What you need is this gnu sed command:
sed -i '1d;$d' myfile*.csv
This will remove 1st and last line in each of the matched file and save it in place.
What you're probably trying to do is:
sed -e '1d' -e '$d' myfile*.csv > merged.csv
But this won't work, because it tells sed to remove the first and last line of ALL files, rather than EACH file. In other words, you'll strip the first line of the first file, and the last line of the last file ... and that's it.
To process each file individually, you probably need to process each file .. individually. :)
for f in myfile*.csv
sed -e '1d;$d' "$f"
done > merged.csv
Note that while this will run in bash, it's also POSIX compatible (both the shell and sed parts). And it does not care whether your input is CSV or any other format, as long as it can be parsed line by line using sed.
I've a list of csv-files and would like to use a for loop to edit the content for each file. I'd like to do that with sed. I have this sed commands which works fine when testing it on one file:
sed 's/[ "-]//g'
So now I want to execute this command for each file in a folder. I've tried this but so far no luck:
for i in *.csv; do sed 's/[ "-]//g' > $i.csv; done
I would like that he would overwrite each file with the edit performed by sed. The sed commands removes all spaces, the " and the '-' character.
Small changes,
for i in *.csv
do
sed -i 's/[ "-]//g' "$i"
done
Changes
when you iterate through the for you get the filenames in $i as example one.csv, two.csv etc. You can directly use these as input to the sed command.
-i Is for inline changes, the sed will do the substitution and updates the file for you. No output redirection is required.
In the code you wrote, I guess you missed any inputs to the sed command
In my case i want to replace every first occurrence of a particular string in each line for several text files, i've use the following:
//want to replace 16 with 1 in each files only for the first occurance
sed -i 's/16/1/' *.txt
In your case, In terminal you can try this
sed 's/[ "-]//g' *.csv
In certain scenarios it might be worth considering finding the files and executing a command on them like explained in this answer (as stated there, make sure echo $PATH doesn't contain .)
find /path/to/csv/ -type f '*.csv' -execdir sed -i 's/[ "-]//g' {} \;
here we:
find all files (type f) which end with .csv in the folder /path/to/csv/
sed the found files in place, ie we replace the original files with the changed version instead of creating numbered csv files ($i.csv)
I am a beginer in Shell script. Below is my requirement in UNIX Korn Shell.
Example:
When we list files using ls command redirect to a file the file names will be stored as below.
$ ls FILE*>FLIST.TXT
$ cat FLIST.TXT
FILE1
FILE2
FILE3
But I need output as below with a prefixed constant string STR,:
$ cat FLIST.TXT
STR,FILE1
STR,FILE2
STR,FILE3
Please let me what should be the ls command to acheive this output.
You can't use ls alone to append data before each file. ls exists to list files.
You will need to use other tools along side ls.
You can append to the front of each line using the sed command:
cat FLIST.TXT | sed 's/^/STR,/'
This will send the changes to stdout.
If you'd like to change the actual file, run sed in place:
sed -i -e 's/^/STR,/' FLIST.TXT
To do the append before writing to the file, pipe ls into sed:
ls FILE* | sed 's/^/STR,/' > FLIST.TXT
The following should work:
ls FILE* | xargs -i echo "STR,{}" > FLIST.TXT
It takes every one of the file names filtered by ls and adds the "STR," prefix to it prior to the appending
I have a large number of words in a text file to replace.
This script is working up until the sed command where I get:
sed: 1: "*.js": invalid command code *
PS... Bash isn't one of my strong points - this doesn't need to be pretty or efficient
cd '/Users/xxxxxx/Sites/xxxxxx'
echo `pwd`;
for line in `cat myFile.txt`
do
export IFS=":"
i=0
list=()
for word in $line; do
list[$i]=$word
i=$[i+1]
done
echo ${list[0]}
echo ${list[1]}
sed -i "s/{$list[0]}/{$list[1]}/g" *.js
done
You're running BSD sed (under OS X), therefore the -i flag requires an argument specifying what you want the suffix to be.
Also, no files match the glob *.js.
This looks like a simple typo:
sed -i "s/{$list[0]}/{$list[1]}/g" *.js
Should be:
sed -i "s/${list[0]}/${list[1]}/g" *.js
(just like the echo lines above)
So myFile.txt contains a list of from:to substitutions, and you are looping over each of those. Why don't you create a sed script from this file instead?
cd '/Users/xxxxxx/Sites/xxxxxx'
sed -e 's/^/s:/' -e 's/$/:/' myFile.txt |
# Output from first sed script is a sed script!
# It contains substitutions like this:
# s:from:to:
# s:other:substitute:
sed -f - -i~ *.js
Your sed might not like the -f - which means sed should read its script from standard input. If that is the case, perhaps you can create a temporary script like this instead;
sed -e 's/^/s:/' -e 's/$/:/' myFile.txt >script.sed
sed -f script.sed -i~ *.js
Another approach, if you don't feel very confident with sed and think you are going to forget in a week what the meaning of that voodoo symbols is, could be using IFS in a more efficient way:
IFS=":"
cat myFile.txt | while read PATTERN REPLACEMENT # You feed the while loop with stdout lines and read fields separated by ":"
do
sed -i "s/${PATTERN}/${REPLACEMENT}/g"
done
The only pitfall I can see (it may be more) is that if whether PATTERN or REPLACEMENT contain a slash (/) they are going to destroy your sed expression.
You can change the sed separator with a non-printable character and you should be safe.
Anyway, if you know whats on your myFile.txt you can just use any.