tac

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.

• 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 …