SUM(1) General Commands Manual SUM(1) NAME sum - Checksum and count the blocks in a file. With no FILE, or when FILE is -, read standard input. SYNOPSIS sum [OPTION]... [FILE]... DESCRIPTION Checksum and count the blocks in a file. With no FILE, or when FILE is -, read standard input. OPTIONS -r use the BSD sum algorithm, use 1K blocks (default) -s, --sysv use System V sum algorithm, use 512 bytes blocks -h, --help Print help -V, --version Print version VERSION v(uutils coreutils) 0.11.0 2026-09-01 SUM(1)