tac: Concatenate and write files in reverse
tac copies each file (`-' means standard input), or
standard input if none are given, to standard output, reversing the
records (lines by default) in each separately. Synopsis:
tac [option]... [file]...
Records are separated by instances of a string (newline by default). By default, this separator string is attached to the end of the record that it follows in the file.
The program accepts the following options. Also see section Common options.
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