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cataltogether and just using thesed -e 'expression_here' file_namesyntax? You're guilty of a useless use of cat there. Also, it may not be necessary with the particular example you specified but semantically, I think you need agmodifier on yoursedregex.sedeither. It was covered earlier in this question today: unix.stackexchange.com/questions/85082/…echo foo | sed "s/foo/$(uptime)/"