linux man page for sha224sum

SHA224SUM(1)							   User Commands						      SHA224SUM(1)

NAME
       sha224sum - compute and check SHA224 message digest

SYNOPSIS
       sha224sum [OPTION]... [FILE]...

DESCRIPTION
       Print or check SHA224 (224-bit) checksums.  With no FILE, or when FILE is -, read standard input.

       -b, --binary
	      read in binary mode

       -c, --check
	      read SHA224 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 RFC 3874.  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.

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

REPORTING BUGS
       Report sha224sum 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 sha224sum 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 sha224sum is maintained as a Texinfo manual.	If the info and sha224sum programs are properly installed at  your
       site, the command

	      info coreutils 'sha224sum invocation'

       should give you access to the complete manual.

GNU coreutils 8.5						   February 2011						      SHA224SUM(1)