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   To search for files based on their contents, you can use the `grep'
program.  For example, to find out which C source files in the current
directory contain the string `thing', you can do:

     grep -l thing *.[ch]

   If you also want to search for the string in files in subdirectories,
you can combine `grep' with `find' and `xargs', like this:

     find . -name '*.[ch]' | xargs grep -l thing

   The `-l' option causes `grep' to print only the names of files that
contain the string, rather than the lines that contain it.  The string
argument (`thing') is actually a regular expression, so it can contain
metacharacters.  This method can be refined a little by using the `-r'
option to make `xargs' not run `grep' if `find' produces no output, and
using the `find' action `-print0' and the `xargs' option `-0' to avoid
misinterpreting files whose names contain spaces:

     find . -name '*.[ch]' -print0 | xargs -r -0 grep -l thing

   For a fuller treatment of finding files whose contents match a
pattern, see the manual page for `grep'.