sha256sum
compute and check SHA256 message digest
Synopsis
sha256sum
[OPTION]... [FILE]...
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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.
copyright
Copyright © 2012 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.
reporting bugs
Report sha256sum bugs to bug-coreutils[:at:]gnu[:dot:]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/>
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.
author
Written by
Ulrich Drepper, Scott Miller, and David Madore.