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. -z, --zero           end each output line with NUL, not newline,

and disable file name escaping

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), sha1sum(1), whirlpoolsum(1).

July 2018 GNU coreutils 8.30 User Commands