cksum - checksum and count the bytes in a file
cksum [FILE]...
cksum [OPTION]
Print CRC checksum and byte counts of each FILE.
Written by Q. Frank Xia.
Report bugs to <bug-coreutils@gnu.org>.
Copyright (C) 2006 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.
The full documentation for cksum is maintained as a Texinfo manual. If the info and cksum programs are properly installed at your site, the command
info cksum
should give you access to the complete manual.