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NAME | SYNOPSIS | DESCRIPTION | AUTHOR | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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CKSUM(1) User Commands CKSUM(1)
cksum - compute and verify file checksums
cksum [OPTION]... [FILE]...
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.
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum-a\-a, --algorithm=TYPE]8;;\
select the digest type to use. See DIGEST below
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--base64\--base64]8;;\
emit base64-encoded digests, not hexadecimal
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum-c\-c, --check]8;;\
read checksums from the FILEs and check them
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum-l\-l, --length=BITS]8;;\
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
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--raw\--raw]8;;\ emit a raw binary digest, not hexadecimal
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--tag\--tag]8;;\ create a BSD-style checksum (the default)
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--untagged\--untagged]8;;\
create a reversed style checksum, without digest type
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum-z\-z, --zero]8;;\
end each output line with NUL, not newline, and disable
file name escaping
The following five options are useful only when verifying checksums:
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--ignore-missing\--ignore-missing]8;;\
don't fail or report status for missing files
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--quiet\--quiet]8;;\
don't print OK for each successfully verified file
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--status\--status]8;;\
don't output anything, status code shows success
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--strict\--strict]8;;\
exit non-zero for improperly formatted checksum lines
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum-w\-w, --warn]8;;\
warn about improperly formatted checksum lines
]8;;https://www.gnu.org/software/coreutils/manual/coreutils.html#cksum--debug\--debug]8;;\
indicate which implementation used
]8;;https://www.gnu.org/software/coreutils/cksum#cksum--help\--help]8;;\ display this help and exit
]8;;https://www.gnu.org/software/coreutils/cksum#cksum--version\--version]8;;\
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)
crc32b (only available through cksum)
md5 (equivalent to md5sum)
sha1 (equivalent to sha1sum)
sha2 (equivalent to sha{224,256,384,512}sum)
sha3 (only available through cksum)
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.
Written by Padraig Brady and Q. Frank Xia.
Report bugs to: bug-coreutils@gnu.org
GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
General help using GNU software: <https://www.gnu.org/gethelp/>
Report any translation bugs to
<https://translationproject.org/team/>
Copyright © 2026 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'
This page is part of the coreutils (basic file, shell and text
manipulation utilities) project. Information about the project
can be found at ⟨http://www.gnu.org/software/coreutils/⟩. If you
have a bug report for this manual page, see
⟨http://www.gnu.org/software/coreutils/⟩. This page was obtained
from the tarball coreutils-9.11.tar.xz fetched from
⟨http://ftp.gnu.org/gnu/coreutils/⟩ on 2026-05-24. If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for the
page, or you have corrections or improvements to the information
in this COLOPHON (which is not part of the original manual page),
send a mail to man-pages@man7.org
GNU coreutils 9.11 April 2026 CKSUM(1)
Pages that refer to this page: b2sum(1), md5sum(1), sha1sum(1), sha224sum(1), sha256sum(1), sha384sum(1), sha512sum(1)
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HTML rendering created 2026-05-24 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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