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
use System V sum algorithm, use 512 bytes blocks
--help display this help and exit
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 email@example.com
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 © 2011 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
info coreutils 'sum invocation'
should give you access to the complete manual.