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\nin the replacement regex is not portable. Using a backslash followed by a newline should work in most implementations of sed, since it is defined by POSIX.s/,/\n/gcan also be replaced by the (portable)y/,/\n/.sedcould be replaced bytr , '\n'. However, I have a hunch that why they want to change commas into newlines might be to process CSV fields (which means they should be using other tools entierly), but that's just my mind reading neurons flashing randomly.