sha256sum man page

sha256sum — compute and check SHA256 message digest


sha256sum {{filename1}}

sha256sum {{filename1}} {{filename2}}

sha256sum -c {{filename.sha256}}


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
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

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


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

Reporting Bugs

GNU coreutils online help: <>
Report sha256sum translation bugs to <>

See Also

Full documentation at: <…>
or available locally via: info '(coreutils) sha2 utilities'

Referenced By

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

November 2016 GNU coreutils 8.26 User Commands