Man1 - cksum.1

Table of Contents

NAME

cksum - compute and verify file checksums

SYNOPSIS

cksum [/OPTION/]… [/FILE/]…

DESCRIPTION

Print or verify checksums. By default use the 32 bit CRC algorithm.

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

Mandatory arguments to long options are mandatory for short options too.

-a, *–algorithm*=/TYPE/
select the digest type to use. See DIGEST below.
-c, –check
read checksums from the FILEs and check them
-l, *–length*=/BITS/
digest length in bits; must not exceed the max for the blake2 algorithm and must be a multiple of 8
–tag
create a BSD-style checksum (the default)
–untagged
create a reversed style checksum, without digest type
-z, –zero
end each output line with NUL, not newline, and disable file name escaping

The following five options are useful only when verifying checksums:

–ignore-missing
don’t fail or report status for missing files
–quiet
don’t print OK for each successfully verified file
–status
don’t output anything, status code shows success
–strict
exit non-zero for improperly formatted checksum lines
-w, –warn
warn about improperly formatted checksum lines
–debug
indicate which implementation used
–help
display this help and exit
–version
output version information and exit

DIGEST determines the digest algorithm and default output format:

sysv
(equivalent to sum -s)
bsd
(equivalent to sum -r)
crc
(equivalent to cksum)
md5
(equivalent to md5sum)
sha1
(equivalent to sha1sum)
sha224
(equivalent to sha224sum)
sha256
(equivalent to sha256sum)
sha384
(equivalent to sha384sum)
sha512
(equivalent to sha512sum)
blake2b
(equivalent to b2sum)
sm3
(only available through cksum)

When checking, the input should be a former output of this program, or equivalent standalone program.

AUTHOR

Written by Padraig Brady and Q. Frank Xia.

REPORTING BUGS

GNU coreutils online help: https://www.gnu.org/software/coreutils/
Report any translation bugs to https://translationproject.org/team/

COPYRIGHT

Copyright © 2021 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.

SEE ALSO

Full documentation https://www.gnu.org/software/coreutils/cksum
or available locally via: info ’(coreutils) cksum invocation’

Author: dt

Created: 2022-02-22 Tue 17:03