tac
concatenate and print files in reverse
TLDR
Print the contents of *file1* reversed to the standard output
Print the contents of the standard input reversed to the standard output
Concatenate several files reversed into the target file
SYNOPSIS
tac [ OPTION ]...[ FILE ]...
DESCRIPTION
Write each FILE to standard output, last line first.
With no FILE, or when FILE is -, read standard input.
Mandatory arguments to long options are mandatory for short options too.
-b , --before attach the separator before instead of after
-r , --regex interpret the separator as a regular expression
-s , --separator = STRING use STRING as the separator instead of newline
--help display this help and exit
--version output version information and exit
REPORTING BUGS
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>
COPYRIGHT
Copyright 2019 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
rev (1) Full documentation <https://www.gnu.org/software/coreutils/tac> or available locally via: info tac invocation
AUTHOR
Written by Jay Lepreau and David MacKenzie.