find command

Separate filenames using the null character:
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find . -name "*.foo" | xargs grep bar

in practice does the same as

grep bar `find . -name "*.foo"`

but will work even if there are so many files to search that they will not all fit on a single command line. It searches in all files in the current directory and its subdirectories which end in .foo f

or occurrences of the string bar.

find . -name "*.foo" -print0 | xargs -0 grep bar

does the same thing, but uses GNU specific extensions to find and xargs to separate filenames using the null character; this will work even if there are whitespace characters, including newlines,