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md5sum

compute and check MD5 message digest

- Calculate the MD5 checksum for a file:
md5sum [filename1]

- Calculate MD5 checksums for multiple files:
md5sum [filename1] [filename2]

- Read a file of MD5SUMs and verify all files have matching checksums:
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
--tag
create a BSD-style checksum
-t, --text
read in text mode (default)

The following five options are useful only when verifying checksums:

--ignore-missing
don't fail or report status for missing files
--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 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.

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

Copyright © 2016 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.

Full documentation at: <http://www.gnu.org/software/coreutils/md5sum> or available locally via: info '(coreutils) md5sum invocation'

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