tac linux command

tac

tac [options] [file]

Named for the common command cat, tac prints files in reverse. Without a filename or with -, it reads from standard input. By default, it reverses the order of the lines, printing the last line first.

Options

-b, --before

Print separator (by default a newline) before string that it delimits.

-r, --regex

Expect separator to be a regular expression.

-s string, --separator=string

Specify alternate separator (default is newline).

--help

Print a help message and then exit.

--version

Print version information and then exit.