Table of Contentstac - concatenate and print files in reverse tac [-br] [-s separator] [--before] [--regex] [--separator=separator] [--help] [--version] [file...] This manual page documents the GNU version of tac. tac copies each given 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. - -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 string, --separator=string
- Use string as the record separator.
- --help
- Print a usage message and exit with a status code indicating success.
- --version
- Print version information on standard output then exit.
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