tail: Fix operation with +n argument
POSIX says Copying shall begin at the point in the file indicated by the -c number or -n number options. The origin for counting shall be 1; that is, -c +1 represents the first byte of the file, -c -1 the last. The origin for counting shall be 1; that is, -n +1 represents the first line of the file, -n -1 the last.
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