Section: User Commands (1)
Updated: March 2015
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:
- create a BSD-style checksum:
- -t, --text
- read in text mode (default):
The following four options are useful only when verifying checksums:
- don't print OK for each successfully verified file:
- don't output anything, status code shows success:
- exit non-zero for improperly formatted checksum lines:
- -w, --warn
- warn about improperly formatted checksum lines:
- display this help and exit:
- 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.
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)
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report md5sum translation bugs to <http://translationproject.org/team/>
Copyright © 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
Full documentation at: <http://www.gnu.org/software/coreutils/md5sum>
or available locally via: info '(coreutils) md5sum invocation'