tac

Display and concatenate files with lines in reversed order. See also: cat. More information: https://www.gnu.org/software/coreutils/tac.

tac path/to/file1 path/to/file2 ...

cat path/to/file | tac

tac --separator , path/to/file1 path/to/file2 ...

tac --regex --separator [,;] path/to/file1 path/to/file2 ...

tac --before path/to/file1 path/to/file2 ...