compute and check SHA256 message digest


Calculate the SHA256 checksum for a file

$ sha256sum [filename1]

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

--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: <>
Report any translation bugs to <>


Copyright 2019 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.


Full documentation <> or available locally via: info sha2 utilities


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

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