pha, phasum, pha64sum, pha128sum, pha256sum, pha512sum - compute and check PHA message digest
pha [-w width] <options> <parameters> [filename [...]]
pha64sum <options> <parameters> [filename [...]]
pha128sum <options> <parameters> [filename [...]]
pha256sum <options> <parameters> [filename [...]]
pha512sum <options> <parameters> [filename [...]]
Print or check PHAlanx (Parallel Hash Alternative) checksums.
For each given filename, `pha' reads the file, computes a digest of many buffers simultaneously, and produces a combined hash of them all.
`pha' is mostly useful on large files, but it can be used for small strings and standard input as well.
When used on strings, `pha' uses a stronger (somewhat slower) hash method - that can also be used on files (per flag).
`pha' is meant for multicore/multiprocessor/multithreaded environments.
arguments:
'filename' hash <filename>
basic options:
-S single thread operation (for performance comparisons) --stdin hash standard input -v verbose info / extended help -V show version -h, --help usage help
basic parameters:
-s string hash <string> -b size use <size>-bytes i/o buffer (default 1MB) -n N spawn N threads -w width compute hash <width> bits long -l [name] save output to log file (default=filename.pha)
special options:
-c, --check list read PHA sums from <list> and check them --demo ascertain accurate operation --Demo ditto, with larger (~100MiB) files --DEMO even larger (~1GiB) files -k keep demo files -t show elapsed time -p show performance estimate -X, --hale stronger method
experimental options:
-D dump operation info -d dump benchmark info in CSV format -H header line for '-d' in CSV format -N M pool of M threads -m size process just <size>-bytes -x less stronger (but faster) method
Without any options, `pha' emits a hint to the 'help' option.
*.pha file containing pha sum(s) to be checked.
/usr/local/bin pha's default executable path
Example 1: perform the 'demo' test suite.
$ pha --demo
# random/ascii...create..digest..verify..PASS # random/binary..create..digest..verify..PASS # random/mixed...create..digest..verify..PASS # string/ascii...ingest..digest..verify..PASS
Example 2: hash a string ("pha")
$ pha -s pha 51ad8a0f9b403bb3 (pha)
Example 3: hash a file.
$ pha phatestasc.dat 3608030c3b070931 phatestasc.dat
Example 4: hash a file with the stronger method.
$ pha -X phatestasc.dat cf28ea333e6e0a12 phatestasc.dat
TERM The value of the TERM environment variable
does not affect the output of `pha'.
The following exit values are returned:
0 No errors of any kind.
>0 An error occurred.
ENOMEM Scant memory to allow proper operation.
EACCES Permission denied (POSIX.1)
Search permission is denied for
a component of the path prefix
of a given <pathname>.
swet(1), vdt(1), xdf(1).
Using the alternate names (pha64sum, pha128sum, pha256sum, pha512sum) renders the '-w' option ineffective.
The stronger methodi (-X) is strongly recommended for files under 1024 bytes.
`phasum' is installed as a synonym for `pha'.
`pha' does not require `root' privileges or SUID file permissions.
`pha' can (per flag) spawn more threads than the underlying system can afford or even support.
Not all possibly harmfull/misleading/nonsensical combinations of the options are prevented nor handled in the appropriate manner, and such use possibly may (and most certainly will) cause unpredictable results.
The original and current versions of `pha' consist of code and documentation written by:
Alexandre Botao http://botao.org
botao@unix.net
botao@linux.sh alexandre@botao.org
Copyright (C) 2012 Alexandre Botao
`pha' is `Free and Open Source Software' (FOSS), and is licensed under the GNU GENERAL PUBLIC LICENSE Version 3 (the "License");
You may not use `pha' except in compliance with the License. You may obtain a copy of the License at
http://www.gnu.org/licenses/
Additionally, a copy of the License is distributed along with `pha' in a file called 'LICENSE';
Commercial support is NOT available for `pha'. Suggestions and/or bug reports are very welcome.
`pha' is distributed on an ``AS IS'' basis, WITHOUT ANY WARRANTY OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.