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 -s separator path/to/file1 path/to/file2 ...

tac -r -s separator path/to/file1 path/to/file2 ...

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