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grepdoesn't care if the lines are sorted; if you can show evidence of different behavior, that'd be good for a separate question (new questions don't go in Answers)grepdoes not create a file. When you use redirection, the shell creates the file. So the file name cannot possibly have anything to do with the options you pass togrep. If editing the file fixed it, maybe there was a non-ASCII character or a control character somewhere and you removed it without noticing. But without seeing your exact source, that's just speculation.