md5sum Man page

Resume Wikipedia de GNU Core Utilities

Coreutils (ou GNU Core Utilities) est un paquetage du projet GNU contenant de nombreux outils de base nécessaires pour les systèmes d’exploitation de type Unix (dont notamment GNU/Linux), tels que cat, ls, et rm. C’est une combinaison de paquetages plus anciens, incluant notamment textutils (pour le texte), shellutils (pour les scripts), et fileutils (pour les fichiers).

MD5SUM(1) User Commands MD5SUM(1)


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

–tag create a BSD-style checksum

-t, –text
read in text mode (default)

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

–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 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 pur‐
poses. Instead, better use an SHA-2 algorithm, implemented in the pro‐
grams sha224sum, sha256sum, sha384sum, sha512sum


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


GNU coreutils online help:
Report md5sum translation bugs to


Copyright © 2016 Free Software Foundation, Inc. License GPLv3+: GNU
GPL version 3 or later .
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.


Full documentation at:
or available locally via: info ‘(coreutils) md5sum invocation’

GNU coreutils 8.25 February 2016 MD5SUM(1)

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