# tac
# Display and concatenate files with lines in reversed order.
# See also: `cat`.
# More information: <https://www.gnu.org/software/coreutils/tac>.
# Concatenate specific files in reversed order:
tac path/to/file1 path/to/file2 ...
# Display `stdin` in reversed order:
cat path/to/file | tac
# Use a specific [s]eparator:
tac -s separator path/to/file1 path/to/file2 ...
# Use a specific [r]egex as a [s]eparator:
tac -r -s separator path/to/file1 path/to/file2 ...
# Use a separator [b]efore each file:
tac -b path/to/file1 path/to/file2 ...
$
cheat.sh
tldr