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.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.50.1.
.TH CKSUM "1" "February 2026" "GNU coreutils 9.10" "User Commands"
.SH NAME
cksum \- compute and verify file checksums
.SH SYNOPSIS
.B cksum
[\fI\,OPTION\/\fR]... [\fI\,FILE\/\fR]...
.SH DESCRIPTION
.\" Add any additional description here
.PP
Print or verify checksums.
By default use the 32 bit CRC algorithm.
.PP
With no FILE, or when FILE is \-, read standard input.
.PP
Mandatory arguments to long options are mandatory for short options too.
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum-a'\fB\-a, \-\-algorithm=\,TYPE\fP\X'tty: link'\/\fR
select the digest type to use. See DIGEST below
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--base64'\fB\-\-base64\fP\X'tty: link'
emit base64\-encoded digests, not hexadecimal
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum-c'\fB\-c, \-\-check\fP\X'tty: link'
read checksums from the FILEs and check them
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum-l'\fB\-l, \-\-length=\,BITS\fP\X'tty: link'\/\fR
digest length in bits; must not exceed the max size
and must be a multiple of 8 for blake2b;
must be 224, 256, 384, or 512 for sha2 or sha3
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--raw'\fB\-\-raw\fP\X'tty: link'
emit a raw binary digest, not hexadecimal
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--tag'\fB\-\-tag\fP\X'tty: link'
create a BSD\-style checksum (the default)
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--untagged'\fB\-\-untagged\fP\X'tty: link'
create a reversed style checksum, without digest type
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum-z'\fB\-z, \-\-zero\fP\X'tty: link'
end each output line with NUL, not newline,
and disable file name escaping
.SS "The following five options are useful only when verifying checksums:"
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--ignore-missing'\fB\-\-ignore\-missing\fP\X'tty: link'
don't fail or report status for missing files
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--quiet'\fB\-\-quiet\fP\X'tty: link'
don't print OK for each successfully verified file
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--status'\fB\-\-status\fP\X'tty: link'
don't output anything, status code shows success
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--strict'\fB\-\-strict\fP\X'tty: link'
exit non\-zero for improperly formatted checksum lines
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum-w'\fB\-w, \-\-warn\fP\X'tty: link'
warn about improperly formatted checksum lines
.TP
\X'tty: link https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--debug'\fB\-\-debug\fP\X'tty: link'
indicate which implementation used
.TP
\X'tty: link https://www.gnu.org/software/coreutils/cksum#cksum--help'\fB\-\-help\fP\X'tty: link'
display this help and exit
.TP
\X'tty: link https://www.gnu.org/software/coreutils/cksum#cksum--version'\fB\-\-version\fP\X'tty: link'
output version information and exit
.SS "DIGEST determines the digest algorithm and default output format:"
.TP
sysv
(equivalent to sum \fB\-s\fR)
.TP
bsd
(equivalent to sum \fB\-r\fR)
.TP
crc
(equivalent to cksum)
.TP
crc32b
(only available through cksum)
.TP
md5
(equivalent to md5sum)
.TP
sha1
(equivalent to sha1sum)
.TP
sha2
(equivalent to sha{224,256,384,512}sum)
.TP
sha3
(only available through cksum)
.TP
blake2b
(equivalent to b2sum)
.TP
sm3
(only available through cksum)
.PP
When checking, the input should be a former output of this program,
or equivalent standalone program.
.SH AUTHOR
Written by Padraig Brady and Q. Frank Xia.
.SH "REPORTING BUGS"
Report bugs to: bug\-coreutils@gnu.org
.br
GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
.br
General help using GNU software: <https://www.gnu.org/gethelp/>
.br
Report any translation bugs to <https://translationproject.org/team/>
.SH COPYRIGHT
Copyright \(co 2026 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
.br
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
.SH "SEE ALSO"
Full documentation <https://www.gnu.org/software/coreutils/cksum>
.br
or available locally via: info \(aq(coreutils) cksum invocation\(aq
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