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  4. sha256sum(1)

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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.

read in binary mode
read SHA256 sums from the FILEs and check them
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:

don't print OK for each successfully verified file
don't output anything, status code shows success
warn about improperly formatted checksum lines
display this help and exit
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.

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 © 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 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.

June 2018 GNU coreutils 8.4