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.
- -V, --version
- Display xxhsum version
- Hash selection. HASHTYPE means 0=32bits, 1=64bits. Default value is 1 (64bits)
- 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
- Exit non-zero for improperly formatted checksum lines
- Don´t print OK for each successfully verified file
- Don´t output anything, status code shows success
- -w, --warn
- Warn about improperly formatted checksum lines
The following options are useful only benchmark purpose
- Benchmark mode. See EXAMPLES for details.
- 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
- 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/
|September 2017||xxhsum 0.6.3|