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⚡ TLDR: SHA256SUM (tldr-pages)

Calculate SHA256 cryptographic checksums.

  • Calculate the SHA256 checksum for one or more files
    sha256sum {{path/to/file1 path/to/file2 ...}}
  • Calculate and save the list of SHA256 checksums to a file
    sha256sum {{path/to/file1 path/to/file2 ...}} > {{path/to/file.sha256}}
  • Calculate a SHA256 checksum from `stdin`
    {{command}} | sha256sum
  • Read a file of SHA256 checksums and filenames and verify all files have matching checksums
    sha256sum {{-c|--check}} {{path/to/file.sha256}}
  • Only show a message for missing files or when verification fails
    sha256sum {{-c|--check}} --quiet {{path/to/file.sha256}}
  • Only show a message when verification fails, ignoring missing files
    sha256sum --ignore-missing {{-c|--check}} --quiet {{path/to/file.sha256}}
  • Check a known SHA256 checksum of a file
    echo {{known_sha256_checksum_of_the_file}} {{path/to/file}} | sha256sum {{-c|--check}}
SHA256SUM(1)                                User Commands                               SHA256SUM(1)



NAME
       sha256sum - compute and check SHA256 message digest

SYNOPSIS
       sha256sum [OPTION]... [FILE]...

DESCRIPTION
       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 for‐
       mer 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 insignifi‐
       cant), and name for each FILE.

       Note: There is no difference between binary mode and text mode on GNU systems.

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

REPORTING BUGS
       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT
       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.

SEE ALSO
       Full documentation <https://www.gnu.org/software/coreutils/sha256sum>
       or available locally via: info '(coreutils) sha2 utilities'



GNU coreutils 8.32                          January 2026                                SHA256SUM(1)

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