bash - How do I use sed on a string? -

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i want use sed strings in bash script without having read or write files. googled around , couldn't find anything

specifically trying number of files in given directory doing somethign like:

raw=$(ls $dirname | wc) # raw --> ? sed ? --> answer

it's not sed, better problem.

ls | wc -l

in general, sed takes string input. example,

ls | sed 's/\./period replaced sed/g'


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