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I need to recursively look for all files containing a specific string so that I can copy a new file over the old one. E.g.:

If a file has the string "replace me":

  1. find the full path of the files:

  2. replace the file with my new filename.php file.

It sounds simple, but I have wasted several hours on it getting nowhere.

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2 Answers 2

up vote 1 down vote accepted
find some/dir \
    -exec grep -q "replace me" {} \; \
    -exec cp some/new/filename.php {} \;
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I am not sure how to use this. how do I test this output before i run cp? –  Scott Elkin Aug 20 '11 at 6:52
Put an echo before the cp. –  Ignacio Vazquez-Abrams Aug 20 '11 at 6:59
@ScottElkin: find can look like black magic, but basically it's just a series of sequential tests or actions that only get run if previous ones return true. You could change the second -exec up to it's closing \; statement to be simply -print to show what was matched by the previous statements. You could also add an "echo" before the cp to print out a preview of the commands that would be run. –  Caleb Aug 20 '11 at 7:01
this works! I am having the same problem as I said below, where it is finding files I don't want. can I filter the results down to certain php files and ignore the rest? –  Scott Elkin Aug 20 '11 at 7:21
You can add as many predicates as you like. The find(1) man page details them all. –  Ignacio Vazquez-Abrams Aug 20 '11 at 7:28

Ignacio's solution with find is probably the best way. Here it is with all the details from comments incorporated. I am specifically only searching for files (not directories) then grouping three statements together in a group with or statements to match any of the names:

find /dir/ \
    -type f \
    \( -name timthumb.php -or -name thumb.php -or -name rt-timthumb.php \) \
    -exec grep -q "timthumb" {} \; \
    -exec cp filename.php {} \;

However you could also do the finding with just shell glob patterns as well, something like this:

shopt -s extglob
for file in /dir/**{timthumb,thumb,rt-timthumb}.php; do
    grep -q 'timthumb' "$file" && cp filename.php "$file"

You could also use the grep to do the recursive search instead of globbing. This would be useful if you had a lot of files:

grep -l -R -Z 'timthumb' /dir/**thumb.php | while read -d $'\0' file; do
    cp filename.php "$file"

In all cases replace "/dir/" with the base path you want to operate on and "filename.php" with the source file you are going to overwrite with. Quote as necessary. Note that in the last example I used a shortcut to match all files whos names match "*thumb.php". You could do this in the other examples too. In the case of find, you could drop the whole set of OR statements in parens and just use -name '*thumb.php'. All of the above examples will only operate on filesthat match those name patterns AND contain the string 'timthumb'.

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the first one didn't work. "/dir/**/*.php" is not a directory error. –  Scott Elkin Aug 20 '11 at 6:49
the second one, when i echo "$file", does not just spit out a path, but a huge list of occurances where it found the string. It is finding non php pages, and find many pages 10+ times since the string occurs multiple times in a page –  Scott Elkin Aug 20 '11 at 6:50
@ScottElkin: Sorry about that. The first one probably chocked because you don't actually have subdirectories and that was ONLY matching subdirectiries. I edited it to match in the current folder or subdirectories. For the second one you need to use the -l option to grep to output just the file name match. Sorry I missed that typing it up. –  Caleb Aug 20 '11 at 6:58
wow, caleb, that is great. now it is giving me all the file paths (like I asked), but it is finding other files I wasn't expecting - files that i don't want to overwrite with filename.php. Is there a way to find only files that are named filename.php? –  Scott Elkin Aug 20 '11 at 7:15
to make sure I don't waste your time - I want to replace all timthumb.php files, along with thumb.php (if 'timthumb' is found within) and rt-timthumb.php. All the rest of the files it finds like log files, function files, I want to ignore. –  Scott Elkin Aug 20 '11 at 7:17

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