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For school I have to do an assignment in which I need to use the grep command within minix to search the source tree for files containing "int main(". With the source tree being stored in /usr/src, I have the following command:

 grep -rn --include=\*.c /usr/src/  "int main("

The problem is that I can't get the command to only search in .c files. So the question is: how do I search, using grep, for any files containing "int main(" while only searching in .c files?

Any help is very much appreciated.

Dimitar
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Wouter Pol
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1 Answers1

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I think this following will work:

grep "int main(" $(find /usr/src|grep .c)

This will take all the files in /usr/src, and see which ones have the string ".c" in their filenames, and then look for some string withing each of those files. The grep withing the $( will not look inside of those files, because it looks in searches for whatever string in stdin, which it receives through the pipe.

EDIT:

This might not work, depending on the level of power your computers have. On my laptop it returns "zsh: argument list too long: grep". But the principle should work.

EDIT EDIT:

If you want to search (for example) also in, say, .h files, you could use the following:

grep "int main(" $(find /usr/src|grep .c|grep .h)
Accidental brine
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