cksum - checksum and count the bytes in a file
cksum [FILE]...
cksum [OPTION]
Print CRC checksum and byte counts of each FILE.
display this help and exit
output version information and exit
Written by Q. Frank Xia.
GNU coreutils online help: https://www.gnu.org/software/coreutils/
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Copyright © 2020 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.
Full documentation https://www.gnu.org/software/coreutils/cksum
or available locally via: info '(coreutils) cksum invocation'