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 ...
stdin
in reversed order: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 ...