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.TH "XXHSUM" "1" "February 2016" "xxhsum 0.5.0" "User Commands"
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.SH "NAME"
\fBxxhsum\fR \- print or check xxHash non\-cryptographic checksums
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.SH "SYNOPSIS"
\fBxxhsum\fR [\fIOPTION\fR] \.\.\. [\fIFILE\fR] \.\.\.
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.SH "DESCRIPTION"
Print or check xxHash (32 or 64bit) checksums\. When \fIFILE\fR is \fB\-\fR, read standard input\.
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.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);
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.P
Since xxHash is non\-cryptographic checksum algorithm, \fBxxhsum\fR should not be used any more for security related purposes\.
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.SH "OPTIONS"
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.TP
\fB\-b\fR
Benchmark mode
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.TP
\fB\-B\fR\fIBLOCKSIZE\fR
\fIBLOCKSIZE\fR specifies benchmark mode\'s test data block size in bytes\. Default value is 102400
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.TP
\fB\-c\fR, \fB\-\-check\fR
Read xxHash sums from the \fIFILE\fRs and check them
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.TP
\fB\-h\fR, \fB\-\-help\fR
Display help and exit
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.TP
\fB\-H\fR\fIHASHTYPE\fR
Hash selection\. \fIHASHTYPE\fR means \fB0\fR=32bits, \fB1\fR=64bits\. Default value is \fB1\fR (64bits)
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.TP
\fB\-\-little\-endian\fR
Set output hexadecimal checksum value as little endian convention\. By default, value is displayed as big endian
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.TP
\fB\-V\fR, \fB\-\-version\fR
Display xxhsum version
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.P
\fBThe following four options are useful only when verifying checksums (\fB\-c\fR)\fR
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.TP
\fB\-\-quiet\fR
Exit non\-zero for improperly formatted checksum lines
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.TP
\fB\-\-strict\fR
Don\'t print OK for each successfully verified file
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.TP
\fB\-\-status\fR
Don\'t output anything, status code shows success
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.TP
\fB\-w\fR, \fB\-\-warn\fR
Warn about improperly formatted checksum lines
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.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\.
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.SH "EXAMPLES"
Output xxHash (64bit) checksum values of specific files to standard output
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.IP "" 4
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.nf

$ xxhsum \-H1 foo bar baz
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.fi
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.IP "" 0
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.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
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.IP "" 4
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.nf

$ xxhsum \-H0 foo bar baz > xyz\.xxh32
$ xxhsum \-H1 foo bar baz > qux\.xxh64
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.fi
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.IP "" 0
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.P
Read xxHash sums from specific files and check them
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.IP "" 4
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.nf

$ xxhsum \-c xyz\.xxh32 qux\.xxh64
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.fi
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.IP "" 0
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.SH "BUGS"
Report bugs at: https://github\.com/Cyan4973/xxHash/issues/
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.SH "AUTHOR"
Yann Collet