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1992-09-13
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Usage: tac
[-br] [-s separator] [+before] [+regex] [+separator separator] [FILE...]
Copy each FILE, or the standard input if none are given or when a
FILE name of '-' is encountered, to the standard output with the
order of the records reversed. The records are separated by
instances of a string, or a newline if none is given. By default, the
separator string is attached to the end of the record that it
follows in the FILE.
Options:
-b, +before The separator is attached to the beginning
of the record that it precedes in the FILE.
-r, +regex The separator is a regular expression.
-s, +separator separator Use SEPARATOR as the record separator.
To reverse a FILE byte by byte, use:
tac -r -s . FILE