sha256sum man page

sha256sum — compute and check SHA256 message digest

TL;DR

sha256sum {{filename1}}

sha256sum {{filename1}} {{filename2}}

sha256sum -c {{filename.sha256}}

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)

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

The following five options are useful only when verifying checksums

--ignore-missing
don't fail or report status for missing files
--quiet
don't print OK for each successfully verified file
--status
don't output anything, status code shows success
--strict
exit non-zero for improperly formatted checksum lines
-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 space, a character indicating input mode ('*' for binary, ' ' for text or where binary is insignificant), and name for each FILE.

Author

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

Reporting Bugs

GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report sha256sum translation bugs to <http://translationproject.org/team/>

See Also

Full documentation at: <http://www.gnu.org/software/coreutils/s…>
or available locally via: info '(coreutils) sha2 utilities'

Referenced By

debsign(1), hmac256(1), md5sum(1), openslide-quickhash1sum(1), whirlpoolsum(1).

January 2016 GNU coreutils 8.25 User Commands