SUM(1)

NAME
sum - checksum and count the blocks in a file

SYNOPSIS
sum [OPTION]... [FILE]...

DESCRIPTION

Print or check BSD (16-bit) checksums. Legacy interface to the cksum utility.

With no FILE, or when FILE is -, read standard input.

-r  use BSD sum algorithm (the default), use 1K blocks

-s, --sysv
    use System V sum algorithm, use 512 bytes blocks

--help
    display this help and exit

--version
    output version information and exit

AUTHOR
Written by Kayvan Aghaiepour and David MacKenzie.

REPORTING BUGS
Report bugs to: bug-coreutils@gnu.org

Report Gentoo bugs to: https://bugs.gentoo.org/
GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
General help using GNU software: <https://www.gnu.org/gethelp/>
Report any translation bugs to <https://translationproject.org/team/>

SEE ALSO
Full documentation <https://www.gnu.org/software/coreutils/sum>
or available locally via: info '(coreutils) sum invocation'

Packaged by Gentoo (9.10 (p0))
Copyright © 2026 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.