MD5SUM

Section: User Commands (1)
Updated: March 2015
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NAME

md5sum - compute and check MD5 message digest

SYNOPSIS

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

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 four 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
--strict: exit non-zero for improperly formatted checksum lines
-w, --warn: warn about improperly formatted checksum lines
--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.

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)

AUTHOR

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

REPORTING BUGS

GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report md5sum translation bugs to <http://translationproject.org/team/>

COPYRIGHT

Copyright © 2014 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.

Index

NAME

SYNOPSIS

DESCRIPTION

The following four options are useful only when verifying checksums: