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GNU Parallel README
Please send problems and feedback to bug-parallel@gnu.org.
= Presentation of GNU Parallel =
GNU Parallel is a shell tool for executing jobs in parallel using one
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or more computers. A job is can be a single command or a small script
that has to be run for each of the lines in the input. The typical
input is a list of files, a list of hosts, a list of users, a list of
URLs, or a list of tables. A job can also be a command that reads from
a pipe. GNU Parallel can then split the input and pipe it into
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commands in parallel.
If you use xargs and tee today you will find GNU Parallel very easy to
use as GNU Parallel is written to have the same options as xargs. If
you write loops in shell, you will find GNU Parallel may be able to
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replace most of the loops and make them run faster by running several
jobs in parallel.
GNU Parallel makes sure output from the commands is the same output as
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you would get had you run the commands sequentially. This makes it
possible to use output from GNU Parallel as input for other programs.
= Full installation =
Full installation of GNU Parallel is as simple as:
./configure && make && make install
If you are not root you can add ~/bin to your path and install in
~/bin and ~/share:
./configure --prefix=$HOME && make && make install
Or if your system lacks 'make' you can simply copy src/parallel
src/sem src/niceload src/sql to a dir in your path.
= Minimal installation =
If you just need parallel and do not have 'make' installed (maybe the
system is old or Microsoft Windows):
wget http://git.savannah.gnu.org/cgit/parallel.git/plain/src/parallel
chmod 755 parallel
cp parallel sem
mv parallel sem dir-in-your-$PATH/bin/
= Test the installation =
After this you should be able to do:
parallel traceroute ::: foss.org.my gnu.org freenetproject.org
This will run traceroute to 3 different hosts in parallel and print
the output when the traceroutes are done.
Watch the intro video for a quick introduction:
https://www.youtube.com/playlist?list=PL284C9FF2488BC6D1 or at
http://tinyogg.com/watch/TORaR/ and http://tinyogg.com/watch/hfxKj/
= New versions =
New versions will be released at: ftp://ftp.gnu.org/gnu/parallel/