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. | ||
.TH "XXHSUM" "1" "February 2016" "xxhsum 0.5.0" "User Commands" | ||
. | ||
.SH "NAME" | ||
\fBxxhsum\fR \- print or check xxHash non\-cryptographic checksums | ||
. | ||
.SH "SYNOPSIS" | ||
\fBxxhsum\fR [\fIOPTION\fR] \.\.\. [\fIFILE\fR] \.\.\. | ||
. | ||
.SH "DESCRIPTION" | ||
Print or check xxHash (32 or 64bit) checksums\. When \fIFILE\fR is \fB\-\fR, read standard input\. | ||
. | ||
.P | ||
\fBxxhsum\fR supports a command line syntax similar but not indentical to md5sum(1)\. Differences are: \fBxxhsum\fR doesn\'t have text/binary mode switch (\fB\-b\fR, \fB\-t\fR); \fBxxhsum\fR always treats file as binary file; \fBxxhsum\fR has hash bit width switch (\fB\-H\fR); | ||
. | ||
.P | ||
Since xxHash is non\-cryptographic checksum algorithm, \fBxxhsum\fR should not be used any more for security related purposes\. | ||
. | ||
.SH "OPTIONS" | ||
. | ||
.TP | ||
\fB\-b\fR | ||
Benchmark mode | ||
. | ||
.TP | ||
\fB\-B\fR\fIBLOCKSIZE\fR | ||
\fIBLOCKSIZE\fR specifies benchmark mode\'s test data block size in bytes\. Default value is 102400 | ||
. | ||
.TP | ||
\fB\-c\fR, \fB\-\-check\fR | ||
Read xxHash sums from the \fIFILE\fRs and check them | ||
. | ||
.TP | ||
\fB\-h\fR, \fB\-\-help\fR | ||
Display help and exit | ||
. | ||
.TP | ||
\fB\-H\fR\fIHASHTYPE\fR | ||
Hash selection\. \fIHASHTYPE\fR means \fB0\fR=32bits, \fB1\fR=64bits\. Default value is \fB1\fR (64bits) | ||
. | ||
.TP | ||
\fB\-\-little\-endian\fR | ||
Set output hexadecimal checksum value as little endian convention\. By default, value is displayed as big endian | ||
. | ||
.TP | ||
\fB\-V\fR, \fB\-\-version\fR | ||
Display xxhsum version | ||
. | ||
.P | ||
\fBThe following four options are useful only when verifying checksums (\fB\-c\fR)\fR | ||
. | ||
.TP | ||
\fB\-\-quiet\fR | ||
Exit non\-zero for improperly formatted checksum lines | ||
. | ||
.TP | ||
\fB\-\-strict\fR | ||
Don\'t print OK for each successfully verified file | ||
. | ||
.TP | ||
\fB\-\-status\fR | ||
Don\'t output anything, status code shows success | ||
. | ||
.TP | ||
\fB\-w\fR, \fB\-\-warn\fR | ||
Warn about improperly formatted checksum lines | ||
. | ||
.SH "EXIT STATUS" | ||
\fBxxhsum\fR exit \fB0\fR on success, \fB1\fR if at least one file couldn\'t be read or doesn\'t have the same checksum as the \fB\-c\fR option\. | ||
. | ||
.SH "EXAMPLES" | ||
Output xxHash (64bit) checksum values of specific files to standard output | ||
. | ||
.IP "" 4 | ||
. | ||
.nf | ||
|
||
$ xxhsum \-H1 foo bar baz | ||
. | ||
.fi | ||
. | ||
.IP "" 0 | ||
. | ||
.P | ||
Output xxHash (32bit and 64bit) checksum values of specific files to standard output, and redirect it to \fBxyz\.xxh32\fR and \fBqux\.xxh64\fR | ||
. | ||
.IP "" 4 | ||
. | ||
.nf | ||
|
||
$ xxhsum \-H0 foo bar baz > xyz\.xxh32 | ||
$ xxhsum \-H1 foo bar baz > qux\.xxh64 | ||
. | ||
.fi | ||
. | ||
.IP "" 0 | ||
. | ||
.P | ||
Read xxHash sums from specific files and check them | ||
. | ||
.IP "" 4 | ||
. | ||
.nf | ||
|
||
$ xxhsum \-c xyz\.xxh32 qux\.xxh64 | ||
. | ||
.fi | ||
. | ||
.IP "" 0 | ||
. | ||
.SH "BUGS" | ||
Report bugs at: https://github\.com/Cyan4973/xxHash/issues/ | ||
. | ||
.SH "AUTHOR" | ||
Yann Collet |
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xxhsum(1) -- print or check xxHash non-cryptographic checksums | ||
============================================================== | ||
|
||
SYNOPSIS | ||
-------- | ||
|
||
`xxhsum` [<OPTION>] ... [<FILE>] ...<br/> | ||
`xxhsum -b` [<OPTION>] ... | ||
|
||
DESCRIPTION | ||
----------- | ||
|
||
Print or check xxHash (32 or 64bit) checksums. When <FILE> is `-`, read | ||
standard input. | ||
|
||
`xxhsum` supports a command line syntax similar but not indentical 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`); | ||
|
||
Since xxHash is non-cryptographic checksum algorithm, `xxhsum` should not be | ||
used any more for security related purposes. | ||
|
||
`xxhsum -b` invokes benchmark mode. See [OPTIONS](#OPTIONS) and [EXAMPLES](#EXAMPLES) for details. | ||
|
||
OPTIONS | ||
------- | ||
|
||
* `-c`, `--check`: | ||
Read xxHash sums from the <FILE>s and check them | ||
|
||
* `-h`, `--help`: | ||
Display help and exit | ||
|
||
* `-H`<HASHTYPE>: | ||
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 | ||
|
||
* `-V`, `--version`: | ||
Display xxhsum version | ||
|
||
**The following four options are useful only when verifying checksums (`-c`)** | ||
|
||
* `--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](#EXAMPLES) for details. | ||
|
||
* `-B`<BLOCKSIZE>: | ||
Only useful for benchmark mode (`-b`). See [EXAMPLES](#EXAMPLES) for details. | ||
<BLOCKSIZE> specifies benchmark mode's test data block size in bytes. | ||
Default value is 102400 | ||
|
||
* `-i`<ITERATIONS>: | ||
Only useful for benchmark mode (`-b`). See [EXAMPLES](#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) |
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