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I have a large number of files which contain text. All files contain the word "replace" (no quotes). I would like to replace that word with the name of the file.

Example, filename is: On Time.txt

Replace the word "replace" (no quotes) with "On Time" (no quotes).

  • Are all these files in the same directory ? Also, do you want to substitute "replace" only if it's a "word" or anywhere this string may occur (e.g. if it's part of the word "irreplaceable") ? – don_crissti Mar 15 '16 at 22:26
  • Good points I should have included. Yes, all files are in the same directory. And the file contents are minimal: "replace" is meant to be replaced with something; "irreplaceable" does not occur in any of the files. – Phydeaux Mar 15 '16 at 22:42
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for filename in "On time.txt" ; do
  replacement=$(echo $filename | sed -e 's,^.*/,,' -e 's,\.[^\.]*$,,')
  [ -f "$filename" ] && sed -i "s,replace,$replacement," "$filename"
done

To do all files in your directory, replace "On time.txt" with * like this:

for filename in * ; do

Note that here filenames must not contain commas (you can choose the character so that it does not appear in your filenames).

  • basename --suffix is not recognized in my distro. – marc Mar 15 '16 at 21:56
  • Sorry, I'm on Ubuntu 15.10 and I didn't check. I replaced it with another sed, so that it should work even if you're not using bash (but @mmmint 's % is good too). – Law29 Mar 15 '16 at 22:00
  • The sed will remove anything following a period in the file name. One could limit it to only three-character extensions if necessary (this will fail on "hidden" files like .bashrc for example) – Law29 Mar 15 '16 at 22:03
  • This one was the winner for me. Thanks so much! – Phydeaux Mar 15 '16 at 22:45
  • @Phydeaux if this was the best answer for you, you should accept it by clicking on the large tick to the left of the answer. – cas Mar 15 '16 at 23:38
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I would use sed for that:

for f in *.txt
do
    fullfile="$f"

    # filename without path (on_time.txt)
    filename=$(basename "$fullfile")

    # remove extension of filename (on_time)
    filename_woext="${filename%.*}"

    # replace all occurrences of "replace" with "on_time" in file
    sed -i -e "s/replace/$filename_woext/g" $filename

done
  • sed -i -e 's/replace/"$filename_woext"/g' $filename will not expand $filename_woext, you need sed -i -e "s/replace/$filename_woext/g" $filename. – Law29 Mar 15 '16 at 22:08
  • Wow, never thought I would have multiple answers within minutes! Both of these answers worked a treat, however I chose to adopt the one proposed by Law29 since the one by mmmint didn't seem to like filenames with spaces, though I'm sure someone sharper than I could tweek that. Thank you Both very much! – Phydeaux Mar 15 '16 at 22:35
  • if you're using basename, you can just do filename=$(basename "$fullfile" .txt) to remove the path AND the extension at the same time. Also, "$fullfile" is redundant, you already have the full filename in $f, so why assign it to another variable? Simpler version:. for f in *.txt ; do filename=$(basename "$f" .txt) ; sed -i -e "s/replace/$filename/g" $f ; done or even for f in *.txt ; do sed -i -e 's/replace/'$(basename "$f" .txt)'/g' $f ; done – cas Mar 15 '16 at 23:35
  • The example is not written for efficiency. Explanation has priority over efficiency. – marc Mar 15 '16 at 23:39
  • Excessive complication undermines understanding. My simplification was not for the purpose of efficiency, it was to remove all the distracting and unnecessary complication in your example. – cas Mar 15 '16 at 23:42
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find . -name "*" -type f | xargs sed -i -e "s/replace/On\ Time/g"

This will replace "all" text files under current dir(and subdirs) as you want.

If you want only in current directory and not in it's subdirs.

find . -name "*" -type f -maxdepth 1 | xargs sed -i -e "s/replace/On\ Time/g"

If you want to replace in a different directory from your current dir.

find /path/do/dir -name "*" -type f | xargs sed -i -e "s/replace/On\ Time/g"

Works for me on zsh shell. Should work on all else too.

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    OP says "I have a large number of files"... Do you think all those files are named On Time.txt ? – don_crissti Mar 15 '16 at 22:41
  • Good point. Sorry, I guess I didn't read the question fully. – Sriram S Mar 15 '16 at 22:53

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