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125 lines
3.2 KiB
125 lines
3.2 KiB
6 years ago
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xxhsum(1) -- print or check xxHash non-cryptographic checksums
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==============================================================
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SYNOPSIS
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--------
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`xxhsum [<OPTION>] ... [<FILE>] ...`
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`xxhsum -b [<OPTION>] ...`
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`xxh32sum` is equivalent to `xxhsum -H0`
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`xxh64sum` is equivalent to `xxhsum -H1`
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DESCRIPTION
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-----------
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Print or check xxHash (32 or 64bit) checksums. When <FILE> is `-`, read
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standard input.
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`xxhsum` supports a command line syntax similar but not identical to
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md5sum(1). Differences are:
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`xxhsum` doesn't have text/binary mode switch (`-b`, `-t`);
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`xxhsum` always treats file as binary file;
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`xxhsum` has hash bit width switch (`-H`);
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As xxHash is a fast non-cryptographic checksum algorithm,
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`xxhsum` should not be used for security related purposes.
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`xxhsum -b` invokes benchmark mode. See [OPTIONS](#OPTIONS) and [EXAMPLES](#EXAMPLES) for details.
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OPTIONS
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-------
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* `-V`, `--version`:
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Display xxhsum version
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* `-H`<HASHTYPE>:
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Hash selection. <HASHTYPE> means `0`=32bits, `1`=64bits.
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Default value is `1` (64bits)
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* `--little-endian`:
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Set output hexadecimal checksum value as little endian convention.
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By default, value is displayed as big endian.
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* `-h`, `--help`:
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Display help and exit
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**The following four options are useful only when verifying checksums (`-c`)**
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* `-c`, `--check`:
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Read xxHash sums from the <FILE>s and check them
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* `--quiet`:
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Exit non-zero for improperly formatted checksum lines
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* `--strict`:
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Don't print OK for each successfully verified file
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* `--status`:
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Don't output anything, status code shows success
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* `-w`, `--warn`:
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Warn about improperly formatted checksum lines
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**The following options are useful only benchmark purpose**
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* `-b`:
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Benchmark mode. See [EXAMPLES](#EXAMPLES) for details.
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* `-B`<BLOCKSIZE>:
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Only useful for benchmark mode (`-b`). See [EXAMPLES](#EXAMPLES) for details.
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<BLOCKSIZE> specifies benchmark mode's test data block size in bytes.
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Default value is 102400
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* `-i`<ITERATIONS>:
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Only useful for benchmark mode (`-b`). See [EXAMPLES](#EXAMPLES) for details.
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<ITERATIONS> specifies number of iterations in benchmark. Single iteration
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takes at least 2500 milliseconds. Default value is 3
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EXIT STATUS
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-----------
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`xxhsum` exit `0` on success, `1` if at least one file couldn't be read or
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doesn't have the same checksum as the `-c` option.
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EXAMPLES
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--------
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Output xxHash (64bit) checksum values of specific files to standard output
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$ xxhsum -H1 foo bar baz
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Output xxHash (32bit and 64bit) checksum values of specific files to standard
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output, and redirect it to `xyz.xxh32` and `qux.xxh64`
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$ xxhsum -H0 foo bar baz > xyz.xxh32
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$ xxhsum -H1 foo bar baz > qux.xxh64
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Read xxHash sums from specific files and check them
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$ xxhsum -c xyz.xxh32 qux.xxh64
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Benchmark xxHash algorithm for 16384 bytes data in 10 times. `xxhsum`
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benchmarks xxHash algorithm for 32-bit and 64-bit and output results to
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standard output. First column means algorithm, second column is source data
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size in bytes, last column means hash generation speed in mega-bytes per
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seconds.
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$ xxhsum -b -i10 -B16384
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BUGS
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----
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Report bugs at: https://github.com/Cyan4973/xxHash/issues/
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AUTHOR
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------
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Yann Collet
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SEE ALSO
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--------
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md5sum(1)
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