centos man page for sha256sum

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

       --tag  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 four 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

       --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 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 character indicating input mode ('*' for binary, space for text), and name for each FILE.

       GNU  coreutils  online  help:  <http://www.gnu.org/software/coreutils/>	Report	sha256sum  translation	bugs  to   <http://translationpro-
       ject.org/team/>

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

COPYRIGHT
       Copyright (C) 2013 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 8.22						     June 2014							      SHA256SUM(1)