TAC(1) General Commands Manual TAC(1) NAME tac - Write each file to standard output, last line first. SYNOPSIS tac [OPTION]... [FILE]... DESCRIPTION Write each file to standard output, last line first. OPTIONS -b, --before attach the separator before instead of after -r, --regex interpret the sequence as a regular expression -s, --separator use STRING as the separator instead of newline -h, --help Print help -V, --version Print version VERSION v(uutils coreutils) 0.11.0 2026-09-01 TAC(1)