SHA256SUM

sha256sum − compute and check SHA256 message digest

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

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)

Note: There is no difference between binary and text mode option on GNU system.

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 character indicating type (‘*’ for binary, ‘ ’ for text), and name for each FILE.

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

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 © 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.

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.