grep -hc pattern files | perl -lpe '${_{_}}+=+${_}}{${_}+=+${_{_}}'


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    cat files | grep -c pattern





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	cat files | grep -hc pattern
	grep -hc pattern files

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	cat file1 file2 ... | grep -hc pattern

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	cat *.h | grep -hc define
	grep -hc define *.h