>| of course, you can always do this:
>| 
>|    # cd /usr/src
>|    # find . -name Makefile | xargs grep ^.PATH | grep cksum
>
>You should never use xargs like that, because it might call
>grep with only one argument in which case a filename would not be
>printened. Instead, use
>
>  find . -name Makefile | xargs grep ^.PATH /dev/null | grep cksum

actually...there's the -H option to grep to work around that (the
complement of -h) but in this particular case, -l is probably more
useful.  the output of grep is (possibly) not altogether complete, so
simply knowing the filename is better.

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