xxhsum(1) User Commands xxhsum(1)
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 xxh128sum is equivalent to xxhsum -H2
DESCRIPTION
Print or check xxHash (32, 64 or 128 bits) checksums. When no FILE,
read standard input, except if it's the console. When FILE is -, read
standard input even if it's the console.
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 files as binary file; xxhsum has a 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.
OPTIONS
-V, --version
Displays xxhsum version and exits
-HHASHTYPE
Hash selection. HASHTYPE means 0=32bits, 1=64bits, 2=128bits.
Alternatively, HASHTYPE 32=32bits, 64=64bits, 128=128bits.
Default value is 1 (64bits)
--tag Output in the BSD style.
--little-endian
Set output hexadecimal checksum value as little endian conven-
tion. By default, value is displayed as big endian.
-h, --help
Displays help and exits
The following four options are useful only when verifying checksums
(-c)
-c, --check FILE
Read xxHash sums from FILE and check them
-q, --quiet
Don't print OK for each successfully verified file
--strict
Return an error code if any line in the file is invalid, not
just if some checksums are wrong. This policy is disabled by
default, though UI will prompt an informational message if any
line in the file is detected invalid.
--status
Don't output anything. Status code shows success.
-w, --warn
Emit a warning message about each improperly formatted checksum
line.
The following options are useful only benchmark purpose
-b Benchmark mode. See EXAMPLES for details.
-b# Specify ID of variant to be tested. Multiple variants can be
selected, separated by a ',' comma.
-BBLOCKSIZE
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
-iITERATIONS
Only useful for benchmark mode (-b). See EXAMPLES for details.
ITERATIONS specifies number of iterations in benchmark. Single
iteration lasts approximately 1000 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. By default, xxhsum benchmarks xxHash main
variants on a synthetic sample of 100 KB, and print results into stan-
dard output. The first column is the algorithm, the second column is
the source data size in bytes, the third column is the number of hashes
generated per second (throughput), and finally the last column trans-
lates speed in megabytes per second.
$ xxhsum -b
In the following example, the sample to hash is set to 16384 bytes, the
variants to be benched are selected by their IDs, and each benchmark
test is repeated 10 times, for increased accuracy.
$ xxhsum -b1,2,3 -i10 -B16384
BUGS
Report bugs at: https://github.com/Cyan4973/xxHash/issues/
AUTHOR
Yann Collet
SEE ALSO
md5sum(1)
xxhsum 0.7.4 July 2020 xxhsum(1)
xxhash 0.8.0 - Generated Sat Aug 1 13:49:08 CDT 2020