- Calculate the SHA256 checksum for a file:
- Calculate SHA256 checksums for multiple files:
sha256sum filename1 filename2
- Calculate and save the list of SHA256 checksums to a file:
sha256sum filename1 filename2 > filename.sha256
- Read a file of SHA256 sums and verify all files have matching checksums:
sha256sum --check filename.sha256
- Only show a message for files for which verification fails:
sha256sum --check --quiet 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)
- -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.
Note: There is no difference between binary mode and text mode on GNU systems.
Written by Ulrich Drepper, Scott Miller, and David Madore.
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report any translation bugs to <https://translationproject.org/team/>
Copyright © 2020 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 '(coreutils) sha2 utilities'
debsign(1), guestfish(1), guestfs(3), hmac256(1), md5sum(1), openslide-quickhash1sum(1), sha1sum(1), whirlpoolsum(1).