SUM

sum − checksum and count the blocks in a file

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

Print checksum and block counts for each FILE.

−r

use BSD sum algorithm, 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

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

Written by Kayvan Aghaiepour and David MacKenzie.

Report sum bugs to bug−coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report sum translation bugs to <http://translationproject.org/team/>

Copyright © 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://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.

The full documentation for sum is maintained as a Texinfo manual. If the info and sum programs are properly installed at your site, the command

info coreutils 'sum invocation'

should give you access to the complete manual.