md5sum.textutils

compute and check MD5 message digest

Synopsis

md5sum [OPTION]... [FILE]...

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description

Print or check MD5 (128-bit) checksums. With no FILE, or when FILE is -, read standard input.
-b, --binary

read in binary mode

-c, --check

read MD5 sums from the FILEs and check them

--tag

create a BSD-style checksum

-t, --text

read in text mode (default)

The following three options are useful only when verifying checksums:
--quiet

don’t print OK for each successfully verified file

--status

don’t output anything, status code shows success

-w, --warn

warn about improperly formatted checksum lines

--strict

with --check, exit non-zero for any invalid input

--help

display this help and exit

--version

output version information and exit

The sums are computed as described in RFC 1321. When checking, the input should be a former output of this program. The default mode is to print a line with checksum, a character indicating input mode (’*’ for binary, space for text), and name for each FILE.

copyright

Copyright © 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://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.

reporting bugs

Report md5sum bugs to bug-coreutils[:at:]gnu[:dot:]org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report md5sum translation bugs to <http://translationproject.org/team/>

bugs

The MD5 algorithm should not be used any more for security related purposes. Instead, better use an SHA-2 algorithm, implemented in the programs sha224sum(1), sha256sum(1), sha384sum(1), sha512sum(1)

see also

The full documentation for md5sum is maintained as a Texinfo manual. If the info and md5sum programs are properly installed at your site, the command

info coreutils 'md5sum invocation'

should give you access to the complete manual.

author

Written by Ulrich Drepper, Scott Miller, and David Madore.