2010-12-02 20:58:10 +00:00
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=head1 search terms
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run commands in parallel
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Parallel shell loops
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multi threading in bash xargs
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# TAGS: parallel | parallel processing | multicore | multiprocessor | Clustering/Distributed Networks
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# job control | multiple jobs | parallelization | text processing | cluster | filters
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# Clustering Tools | Command Line Tools | Utilities | System Administration
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# Bash parallel
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GNU parallel execution shell bash script simultaneous concurrent linux
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scripting run xargs ppss code.google.com/p/ppss/
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@vvuksan @ychaker @ncb000gt
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xargs can lead to nasty surprises caused by the separator problem
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http://nd.gd/0t GNU Parallel http://nd.gd/0s may be better.
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Comments:
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2012-01-22 14:06:19 +00:00
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http://pi.dk/0 https://www.gnu.org/software/parallel/
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http://pi.dk/1 https://www.youtube.com/playlist?list=PL284C9FF2488BC6D1
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http://pi.dk/2 https://savannah.gnu.org/news/?group=parallel
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2010-12-02 20:58:10 +00:00
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2012-01-22 14:06:19 +00:00
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http://pi.dk/5 https://en.wikipedia.org/wiki/Xargs#The_separator_problem
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http://pi.dk/6 https://www.gnu.org/software/parallel/man.html#differences_between_xargs_and_gnu_parallel
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http://pi.dk/7 https://www.gnu.org/software/parallel/man.html#example__distributing_work_to_local_and_remote_computers
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2010-12-02 23:04:12 +00:00
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2012-01-22 14:06:19 +00:00
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If you like xargs you may love GNU Parallel: http://pi.dk/1
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With GNU Parallel (http://pi.dk/0) you can do:
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2010-12-02 23:04:12 +00:00
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ls | grep jpeg | parallel mv {} {.}.jpg
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2012-01-22 14:06:19 +00:00
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Watch the intro video for GNU Parallel: http://pi.dk/1
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2010-12-02 20:58:10 +00:00
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If your input file names are generated by users, you need to deal with
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surprising file names containing space, ', or " in the filename.
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xargs can give nasty surprises due to the separator problem
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2012-01-22 14:06:19 +00:00
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http://pi.dk/5
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2010-12-02 20:58:10 +00:00
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GNU Parallel http://nd.gd/0s may be better.
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@jaylyerly @stevenf xargs will bite you if file names contain
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2012-01-22 14:06:19 +00:00
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space http://pi.dk/5. Use GNU Parallel instead: http://pi.dk/0
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2010-12-02 20:58:10 +00:00
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Please repay by spreading the word about GNU Parallel to your
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contacts/blog/facebook/linkedin/mailing lists/user group
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Your use of xargs can lead to nasty surprises because of the separator
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problem http://en.wikipedia.org/wiki/Xargs#The_separator_problem
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GNU Parallel http://www.gnu.org/software/parallel/ does not have that
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problem.
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If you have GNU Parallel http://www.gnu.org/software/parallel/ installed you can do this:
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2011-12-09 22:25:20 +00:00
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You can install GNU Parallel simply by:
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2010-12-02 20:58:10 +00:00
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2011-12-09 22:25:20 +00:00
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wget http://git.savannah.gnu.org/cgit/parallel.git/plain/src/parallel
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chmod 755 parallel
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cp parallel sem
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2010-12-02 20:58:10 +00:00
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2012-01-22 03:42:05 +00:00
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Watch the intro videos for GNU Parallel to learn more:
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https://www.youtube.com/playlist?list=PL284C9FF2488BC6D1
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2011-12-09 22:25:20 +00:00
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GNU Parallel also makes it possible to run small scripts. Try this:
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2010-12-02 20:58:10 +00:00
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2011-12-09 22:25:20 +00:00
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ls *.zip | parallel 'mkdir {.}; cd {.}; unzip ../{}'
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2010-12-02 20:58:10 +00:00
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