md5sum man page

md5sum — compute and check MD5 message digest


md5sum {{filename1}}

md5sum {{filename1}} {{filename2}}

md5sum -c {{filename.md5}}


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


create a BSD-style checksum

-t, --text

read in text mode (default)

Note: There is no difference between binary and text mode option on GNU system.

The following five options are useful only when verifying checksums


don't fail or report status for missing files


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 space, a character indicating input mode ('*' for binary, ' ' for text or where binary is insignificant), 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)


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

Reporting Bugs

GNU coreutils online help: <>
Report md5sum translation bugs to <>

See Also

Full documentation at: <>
or available locally via: info '(coreutils) md5sum invocation'

Referenced By

cfv(1), changestool(1), cksfv(1), debsign(1), fdupes(1), jigdo-file(1), mcookie(1), monit(1), openvas-nvt-sync(8), perl5140delta(1), pmldigital(1), rdfind(1), xorriso(1), xorrisofs(1).

November 2016 GNU coreutils 8.26 User Commands