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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

DESCRIPTION

Print or check xxHash (32 or 64bit) checksums. When FILE is -, read standard input.

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 file as binary file; xxhsum has 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
Display xxhsum version
-HHASHTYPE
Hash selection. HASHTYPE means 0=32bits, 1=64bits. Default value is 1 (64bits)
--little-endian
Set output hexadecimal checksum value as little endian convention. By default, value is displayed as big endian.
-h, --help
Display help and exit

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

-c, --check
Read xxHash sums from the FILEs and check them
--quiet
Exit non-zero for improperly formatted checksum lines
--strict
Don´t print OK for each successfully verified file
--status
Don´t output anything, status code shows success
-w, --warn
Warn about improperly formatted checksum lines

The following options are useful only benchmark purpose

-b
Benchmark mode. See EXAMPLES for details.
-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 takes at least 2500 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 for 16384 bytes data in 10 times. xxhsum benchmarks xxHash algorithm for 32-bit and 64-bit and output results to standard output. First column means algorithm, second column is source data size in bytes, last column means hash generation speed in mega-bytes per seconds.

$ xxhsum -b -i10 -B16384

BUGS

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

AUTHOR

Yann Collet

SEE ALSO

md5sum(1)
September 2017 xxhsum 0.6.3