sha256sum1
Compute and check sha256 message digest
Usage
sha256sum [OPTION] ...
[FILE] ...
Overview
Print or check SHA256 (256-bit) checksums. Legacy interface to the cksum(1) utility.
With no FILE, or when FILE is -, read standard input.
-
-b, --binary -
read in binary mode
-
-c, --check -
read checksums from the FILEs and check them
-
--tag -
create a BSD-style checksum
-
-t, --text -
read in text mode (default)
-
-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:
-
--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.
There is no difference between binary mode and text mode on GNU systems.
Releases
11 releases since Debian 4.0 (Etch); the text changed 10 times.
--ignore-missing since Debian 9 (Stretch);
--quiet since Debian 6.0 (Squeeze);
--strict since Debian 7 (Wheezy);
--tag since Debian 8 (Jessie);
--zero since Debian 10 (Buster);
-z since Debian 10 (Buster).