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’