> Linux Man Page: "md5sum"


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The Linux Documentation Project maintains an archive of snaphots of the (English language) core Linux manual pages that are maintained by Michael Kerrisk. Corrections and additions are welcome, but review the "Help Wanted" list, first.

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md5sum - compute and check MD5 message digest


md5sum [OPTION] [FILE]...


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

-t, --text
read in text mode (default)

The following two options are useful only when verifying checksums: --status
don’t output anything, status code shows success

-w, --warn
warn about improperly formatted checksum lines

--help 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.


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

Reporting Bugs

Report bugs to <>.


Copyright © 2007 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <>. There is NO WARRANTY, to the extent permitted by law.

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 md5sum

should give you access to the complete manual.

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