SYD-SUM(1)                  General Commands Manual                 SYD-SUM(1)

NAME
       syd-sum - Calculate checksum of the given file or standard input

SYNOPSIS
       syd-sum -a alg [-bhx] <file|->

DESCRIPTION
       Given a file, calculate the checksum of the file using the Linux Kernel
       Crypto API (AF_ALG).

       Only regular files and FIFOs (pipes) may be hashed.

       Given no positional arguments or "-" as argument, calculate checksum of
       standard input.

OPTIONS

       -a alg   Hash algorithm to use (required).
                Any algorithm listed in proc_crypto(5) with type ahash or
                shash may be used.
                Use -a list to list available algorithms.
                Examples: sha256, sha512, sha3-512, blake2b-256, md5, crc32c
       -b       Binary output.
       -x       Hexadecimal output (default).
       -h       Display help.


EXAMPLES
           syd-sum -a sha256 /usr/bin/syd
           echo hello | syd-sum -a blake2b-512
           syd-sum -a crc32c -b /etc/passwd > /tmp/crc.bin

SEE ALSO
       syd(1), syd(2), syd(5), syd-path(1), proc_crypto(5)

       syd homepage: https://sydbox.exherbo.org/

AUTHORS
       Maintained by Ali Polatel. Up-to-date sources can be found at
       https://gitlab.exherbo.org/sydbox/sydbox.git and bugs/patches can be
       submitted to https://gitlab.exherbo.org/groups/sydbox/-/issues. Discuss
       in #sydbox on Libera Chat or in #sydbox:mailstation.de on Matrix.

                                  2026-03-22                        SYD-SUM(1)