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tail -n/-c +NUM, is different from tail -n/-c NUM, and head -n/-c NUM, and head -n/c -NUM, in that it specifies a 1 based index rather than a count to skip/include. So clarify this in tail --help and tail info manual. Note we also mention this gotcha at: https://www.pixelbeat.org/docs/coreutils-gotchas.html#tail * doc/coreutils.texi (tail invocation): Give examples for -c/-n +NUM, to make it clear one has to specify a number 1 larger than might be expected. * src/tail.c (usage): State the skip at start edge case more clearly in the -n description. -c is not often used with tail so we leave full explanation of that to the info manual. Also split the string to simplify translation.