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GNU Parallel 20110522 ('Pakistan') released

From: Ole Tange
Subject: GNU Parallel 20110522 ('Pakistan') released
Date: Sun, 22 May 2011 01:18:41 +0200

GNU Parallel 20115022 ('Pakistan') has been released. It is available
for download at:

This is a major release. So far GNU Parallel has been focused on
replacing a single for-loop. The Pakistan release introduces ways to
replace nested loops.

If you are using the {1} {2} syntax for multiple input sources, then
you need to read about --xapply as the function has changed.

New in this release:

* Multiple ::: can be put on the command line and will be treated
similar to contents from multiple -a's.

* ::: and :::: can now be mixed on the command line. Use {1} .. {n} to
refer to inputs from the different input sources.

* --xapply is now needed to get xapply's behaviour of reading one line
from each of the input sources.

* Multiple input sources will cause all combinations of arguments from
the sources to be generated. E.g. 'parallel echo {1}+{2} ::: 1 2 ::: a
b c' will print 1+a 1+b 1+c 2+a 2+b 2+c. This can often replace nested

* Implemented {//} for the input line with the basename removed (dirname).

* New video showing the new ::: and :::: input sources.

* GNU Parallel now has a logo.

* Article about GNU SQL in USENIX Magazine ;login: (print)

* Using GNU Parallel with EC2. Thanks to Kevin Wu.

* Review with idea for {..} and {...} in Japanese. Thanks to ichii386.

* Upgrade GNU Parallel using Macports. Thanks to Phil Hollenback.

* Robert from Echo One discusses using processes instead of threads:

* How to run GNU Parallel on a SLURM cluster. Thanks to Kevin Stock.

* Short article about using GNU Parallel with lame:

* Using GNU Parallel to run tail -f in Japanese. Thanks to Clouder.

* BBC Research & Development uses GNU Parallel:

* Short article about using GNU Parallel on RHEL. Thanks to Rishi

* Using GNU Parallel for FLAC->MP3 conversion. Thanks to Derek

* Bug fixes and man page updates.

= About GNU Parallel =

GNU Parallel is a shell tool for executing jobs in parallel using one
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
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
replace most of the loops and make them run faster by running several
jobs in parallel. GNU Parallel can even replace nested loops.

GNU Parallel makes sure output from the commands is the same output as
you would get had you run the commands sequentially. This makes it
possible to use output from GNU Parallel as input for other programs.

You can find more about GNU Parallel at:

Watch the intro video on or
at and

When using GNU Parallel for a publication please cite:

O. Tange (2011): GNU Parallel - The Command-Line Power Tool, ;login:
The USENIX Magazine, February 2011:42-47.

= About GNU SQL =

GNU sql aims to give a simple, unified interface for accessing
databases through all the different databases' command line clients.
So far the focus has been on giving a common way to specify login
information (protocol, username, password, hostname, and port number),
size (database and table size), and running queries.

The database is addressed using a DBURL. If commands are left out you
will get that database's interactive shell.

When using GNU SQL for a publication please cite:

O. Tange (2011): GNU SQL - A Command Line Tool for Accessing Different
Databases Using DBURLs, ;login: The USENIX Magazine, April 2011:29-32.

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