pipe - How to grep copied content -

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i have content (say paragraph or hundred odd lines book - have newlines) have copied. how grep them? mean there utility can echo content output can fed grep command through pipe?

thanks.

where content? if in file 'foo' try

grep -e whateveryouarelookingfor foo

if in bash variable 'bar' try

echo "${bar}" | grep -e whateveryouarelookingfor

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