md5sum - compute and check MD5 message digest
Print or check MD5 (128-bit) checksums. With no FILE, or when FILE is -, read
- -b, --binary
- read in binary mode
- -c, --check
- read MD5 sums from the FILEs and check them
- -t, --text
- read in text mode (default)
The following three options are useful only when verifying
- don't print OK for each successfully verified file
- don't output anything, status code shows success
- -w, --warn
- warn about improperly formatted checksum lines
- with --check, exit non-zero for any invalid
- 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 type (`*' for binary, ` ' 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
Written by Ulrich Drepper, Scott Miller, and David Madore.
Report md5sum bugs to email@example.com
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/
Copyright © 2011 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.
The full documentation for md5sum
is maintained as a Texinfo manual. If
programs are properly installed at your
site, the command
- info coreutils 'md5sum invocation'
should give you access to the complete manual.