sha256sum
compute and check SHA256 message digest
- Provided by: coreutils (Version: 8.21-1ubuntu5.4)
- Report a bug
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)
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
- --strict
- with --check, exit non-zero for any invalid input
- --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.
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 © 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.