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149 lines
4.1 KiB
Markdown
149 lines
4.1 KiB
Markdown
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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`xxh128sum` is equivalent to `xxhsum -H2`
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DESCRIPTION
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-----------
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Print or check xxHash (32, 64 or 128 bits) checksums.
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When no <FILE>, read standard input, except if it's the console.
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When <FILE> is `-`, read standard input even if it's the console.
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`xxhsum` supports a command line syntax similar but not identical to md5sum(1).
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Differences are:
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`xxhsum` doesn't have text/binary mode switch (`-b`, `-t`);
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`xxhsum` always treats files as binary file;
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`xxhsum` has a 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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Displays xxhsum version and exits
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* `-H`<HASHTYPE>:
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Hash selection. <HASHTYPE> means `0`=32bits, `1`=64bits, `2`=128bits.
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Alternatively, <HASHTYPE> `32`=32bits, `64`=64bits, `128`=128bits.
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Default value is `1` (64bits)
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* `--tag`:
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Output in the BSD style.
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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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Displays help and exits
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**The following four options are useful only when verifying checksums (`-c`)**
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* `-c`, `--check` <FILE>:
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Read xxHash sums from <FILE> and check them
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* `-q`, `--quiet`:
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Don't print OK for each successfully verified file
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* `--strict`:
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Return an error code if any line in the file is invalid,
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not just if some checksums are wrong.
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This policy is disabled by default,
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though UI will prompt an informational message
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if any line in the file is detected invalid.
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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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Emit a warning message about each improperly formatted checksum line.
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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#`:
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Specify ID of variant to be tested.
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Multiple variants can be selected, separated by a ',' comma.
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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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lasts approximately 1000 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.
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By default, `xxhsum` benchmarks xxHash main variants
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on a synthetic sample of 100 KB,
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and print results into standard output.
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The first column is the algorithm,
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the second column is the source data size in bytes,
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the third column is the number of hashes generated per second (throughput),
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and finally the last column translates speed in megabytes per second.
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$ xxhsum -b
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In the following example,
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the sample to hash is set to 16384 bytes,
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the variants to be benched are selected by their IDs,
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and each benchmark test is repeated 10 times, for increased accuracy.
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$ xxhsum -b1,2,3 -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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