NAME

sha1sum — write and verify sha1 checksums

SYNOPSIS

sha1sum [-c] [file...]

DESCRIPTION

sha1sum reads each file, or standard input if none were specified, and prints each of their SHA1 checksum.

OPTIONS

-c: Verify checksums contained in each file. Currently supported format being checksum, whitespace, an optional asterisk ‘*’ and finally a filename.

EXIT STATUS

The sha1sum utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

Check tarballs in current directory against the sha1sums.txt digest and ignore the rest of it:

printf %s\n *.tar* | grep -f -
  sha1sums.txt | sha1sum -c -

STANDARDS

SHA1 is standardized both in FIPS 180-4 and RFC 3174.

AUTHORS

Haelwenn (lanodan) Monnier <contact+utils@hacktivis.me>

SECURITY CONSIDERATIONS

Due to it's known collisions SHA-1 is deprecated, the sha1sum utility is only provided in the interest of compatibility and verification of legacy checksums. For non-legacy usage, sha256sum(1) should be used instead.