SHA1SUM(1) General Commands Manual SHA1SUM(1) (NAME) sha1sum - SHA1 (SYNOPSIS) sha1sum [OPTIONS] [FILE]... (DESCRIPTION) SHA1. (OPTIONS) -c, --check FILE -w, --warn --status --quiet OK --ignore-missing --strict --tag BSD -z, --zero NUL (escaping) -h, --help -V, --version (VERSION) v(uutils coreutils) 0.11.0 2026-09-01 SHA1SUM(1)