tac − concatenate and print files in reverse
tac [OPTION]... [FILE]...
Write each FILE to standard output, last line first.
With no FILE, or when FILE is −, read standard input.
arguments to long options are mandatory for short options
attach the separator before instead of after
interpret the separator as a regular expression
use STRING as the separator instead of newline
display this help and exit
output version information and exit
Written by Jay Lepreau and David MacKenzie.
online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>
© 2019 Free Software Foundation, Inc. License GPLv3+:
GNU GPL version 3 or later
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
or available locally via: info '(coreutils) tac invocation'