Friday 1 October 2010

Checking MD5 sum of file in Linux

Linux offers a command line tool called md5sum which can be used to find the md5 checksum of the files in LINUX.

The info md5sum displays the following information about this command.

File: *manpages*, Node: md5sum, Up: (dir)

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

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

The following two options are useful only when verifying checksums:
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.

Report bugs to .

Copyright (C) 2008 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.

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.

GNU coreutils 2008 MD5SUM(1)