compute and check SHA256 message digest
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
--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.
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
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Copyright 2019 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://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.
Full documentation <https://www.gnu.org/software/coreutils/sha256sum> or available locally via: info sha2 utilities
Written by Ulrich Drepper, Scott Miller, and David Madore.