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Why does this command

find /etc -exec grep student {} \; 2>/dev/null

show me more results than this command

grep -r student /etc 2>/dev/null

terminal window

  • Add -H to the grep command in the find run string: this will show you the file names, and thereby give you a better idea of what is happening, whether more files are found, or more matches in each file. It looks as though the find command is finding a dictionary, not found by grep -r. – AFH May 24 '18 at 19:14
  • Thank you AFH for the -H explanation will definitely use it in the future. Thank you Kamil, -R instead of -r has solved the problem. Nope my grep wasn't an alias. – Tomas.R May 24 '18 at 19:33
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Probably there are some symbolic links under your /etc. It looks like your grep -r doesn't follow them but find does.

Try grep -R.

Note: neither -r nor -R is required by POSIX. Some implementations of grep may not support them; some may support one of them, not necessarily following (or not) symbolic links like in this example; some may treat -R and -r alike. Refer to man 1 grep in your OS to be sure.

  • I was puzzled why find with its default -P was returning links, but I now realise that that is precisely what it does: it returns a link, but this is passed to grep, which follows the link when reading the file, whereas grep -r ignores links, whether to files or directories. Both commands will return the same search results if -type f is added to the find run string. This may be obvious, but it took me some time to understand, so I thought it worth noting. Also, note that, if there are directory links, grep -R will check more files than the find command unless -L is added. – AFH May 24 '18 at 22:36

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