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Linux 2.6 - man page for sha256sum (linux section 1)

SHA256SUM(1)				  User Commands 			     SHA256SUM(1)

NAME
       sha256sum - compute and check SHA256 message digest

SYNOPSIS
       sha256sum [OPTION]... [FILE]...

DESCRIPTION
       Print or check SHA256 (256-bit) checksums.  With no FILE, or when FILE is -, read standard
       input.

       -b, --binary
	      read in binary mode

       -c, --check
	      read SHA256 sums from the FILEs and check them

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

   The following three options are useful only when verifying checksums:
       --quiet
	      don't print OK for each successfully verified file

       --status
	      don't output anything, status code shows success

       -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 FIPS-180-2.  When checking, the input  should  be	a
       former output of this program.  The default mode is to print a line with checksum, a char-
       acter indicating type (`*' for binary, ` ' for text), and name for each FILE.

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

REPORTING BUGS
       Report sha256sum bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report sha256sum translation bugs to <http://translationproject.org/team/>

COPYRIGHT
       Copyright (C) 2010 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.

SEE ALSO
       The full documentation for sha256sum is maintained as a Texinfo manual.	If the	info  and
       sha256sum programs are properly installed at your site, the command

	      info coreutils 'sha256sum invocation'

       should give you access to the complete manual.

GNU coreutils 8.5			  February 2011 			     SHA256SUM(1)


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