Display and concatenate files with lines in reversed order. See also:
cat. More information: https://www.gnu.org/software/coreutils/manual/html_node/tac-invocation.html.
tac {{path/to/file1 path/to/file2 ...}}
stdin in reversed order:{{cat path/to/file}} | tac
tac {{[-s|--separator]}} {{separator}} {{path/to/file1 path/to/file2 ...}}
tac {{[-r|--regex]}} {{[-s|--separator]}} {{separator}} {{path/to/file1 path/to/file2 ...}}
tac {{[-b|--before]}} {{path/to/file1 path/to/file2 ...}}