XXHSUM(1)                        User Commands                       XXHSUM(1)

NAME
       xxhsum - print or check xxHash non-cryptographic checksums

SYNOPSIS
       xxhsum [<OPTION>] ... [<FILE>] ... xxhsum -b [<OPTION>] ...

       xxh32sum is equivalent to xxhsum -H0 xxh64sum is equivalent to xxhsum
       -H1 xxh128sum is equivalent to xxhsum -H2

DESCRIPTION
       Print or check xxHash (32, 64 or 128 bits) checksums. When no FILE,
       read standard input, except if it's the console. When FILE is -, read
       standard input even if it's the console.

       xxhsum supports a command line syntax similar but not identical to
       md5sum(1). Differences are: xxhsum doesn't have text/binary mode switch
       (-b, -t); xxhsum always treats files as binary file; xxhsum has a hash
       bit width switch (-H);

       As xxHash is a fast non-cryptographic checksum algorithm, xxhsum should
       not be used for security related purposes.

       xxhsum -b invokes benchmark mode. See OPTIONS and EXAMPLES for details.

OPTIONS
       -V, --version
              Displays xxhsum version and exits

       -HHASHTYPE
              Hash selection. HASHTYPE means 0=32bits, 1=64bits, 2=128bits.
              Alternatively, HASHTYPE 32=32bits, 64=64bits, 128=128bits.
              Default value is 1 (64bits)

       --tag  Output in the BSD style.

       --little-endian
              Set output hexadecimal checksum value as little endian
              convention. By default, value is displayed as big endian.

       -h, --help
              Displays help and exits

       The following four options are useful only when verifying checksums
       (-c)

       -c, --check FILE
              Read xxHash sums from FILE and check them

       -q, --quiet
              Don't print OK for each successfully verified file

       --strict
              Return an error code if any line in the file is invalid, not
              just if some checksums are wrong. This policy is disabled by
              default, though UI will prompt an informational message if any
              line in the file is detected invalid.

       --status
              Don't output anything. Status code shows success.

       -w, --warn
              Emit a warning message about each improperly formatted checksum
              line.

       The following options are useful only benchmark purpose

       -b     Benchmark mode. See EXAMPLES for details.

       -b#    Specify ID of variant to be tested. Multiple variants can be
              selected, separated by a ',' comma.

       -BBLOCKSIZE
              Only useful for benchmark mode (-b). See EXAMPLES for details.
              BLOCKSIZE specifies benchmark mode's test data block size in
              bytes. Default value is 102400

       -iITERATIONS
              Only useful for benchmark mode (-b). See EXAMPLES for details.
              ITERATIONS specifies number of iterations in benchmark. Single
              iteration lasts approximately 1000 milliseconds. Default value
              is 3

EXIT STATUS
       xxhsum exit 0 on success, 1 if at least one file couldn't be read or
       doesn't have the same checksum as the -c option.

EXAMPLES
       Output xxHash (64bit) checksum values of specific files to standard
       output

           $ xxhsum -H1 foo bar baz

       Output xxHash (32bit and 64bit) checksum values of specific files to
       standard output, and redirect it to xyz.xxh32 and qux.xxh64

           $ xxhsum -H0 foo bar baz > xyz.xxh32
           $ xxhsum -H1 foo bar baz > qux.xxh64

       Read xxHash sums from specific files and check them

           $ xxhsum -c xyz.xxh32 qux.xxh64

       Benchmark xxHash algorithm. By default, xxhsum benchmarks xxHash main
       variants on a synthetic sample of 100 KB, and print results into
       standard output. The first column is the algorithm, the second column
       is the source data size in bytes, the third column is the number of
       hashes generated per second (throughput), and finally the last column
       translates speed in megabytes per second.

           $ xxhsum -b

       In the following example, the sample to hash is set to 16384 bytes, the
       variants to be benched are selected by their IDs, and each benchmark
       test is repeated 10 times, for increased accuracy.

           $ xxhsum -b1,2,3 -i10 -B16384

BUGS
       Report bugs at: https://github.com/Cyan4973/xxHash/issues/

AUTHOR
       Yann Collet

SEE ALSO
       md5sum(1)

xxhsum 0.7.4                       July 2020                         XXHSUM(1)