tac − tac
tac [OPTION]... [FILE]...
Write each file to standard output, last line first.
−b, −−before
attach the separator before instead of after
−r, −−regex
interpret the sequence as a regular expression
−s, −−separator <STRING>
use STRING as the separator instead of newline
−h, −−help
Print help
−V, −−version
Print version