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GNU Parallel 20160122 ('Bowie') released

From: Ole Tange
Subject: GNU Parallel 20160122 ('Bowie') released
Date: Sat, 23 Jan 2016 10:53:18 +0100

GNU Parallel 20160122 ('Bowie') has been released. It is available for
download at:

Haiku of the month:

  Dash dash pipe too slow?
  Dash dash pipepart is your friend.
  Use GNU Parallel
    -- Ole Tange

New in this release:

* --sql DBURL uses DBURL as storage for jobs and output. It does not
run any jobs so it requires at least one --sqlworker. DBURL must point
to a table.

* --sqlworker DBURL gets jobs from DBURL and stores the result back to DBURL.

* --sqlandworker is a shorthand for --sql and --sqlworker.

* --sqlworker requires the output of a single job to fit in memory.

* --results now also saves a file called 'seq' containing the sequence number.

* If $PARALLEL_ENV is a file, then that file will be read into $PARALLEL_ENV.

* man parallel_tutorial has been given an overhaul.

* --workdir now accepts replacementstrings.

* GNU Parallel was cited in: Possum - A Framework for
Three-Dimensional Reconstruction of Brain Images rfom Serial Sections

* GNU Parallel was cited in: A Genetic Algorithm for the selection of
structural MRI features for classification of Mild Cognitive
Impairment and Alzheimer's Disease

* GNU Parallel was cited in: The Effect of Domain Modeling on
Performance of Planning Algorithms

* Plotting time tables for jobs run by GNU Parallel

* GNU Parallel was used in: Mission Impossible: you have 1 minute to
analyze the Ebola Genome

* GNU Parallel is used in LAST:

* Distributed Log Search Using GNU Parallel

* Bug fixes and man page updates.

GNU Parallel - For people who live life in the parallel lane.

= 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:

You can install GNU Parallel in just 10 seconds with: (wget -O - || curl | bash

Watch the intro video on

Walk through the tutorial (man parallel_tutorial). Your commandline
will love you for it.

When using programs that use GNU Parallel to process data for
publication please cite:

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

If you like GNU Parallel:

* Give a demo at your local user group/team/colleagues
* Post the intro videos on Reddit/Diaspora*/forums/blogs/ lists
* Get the merchandise
* Request or write a review for your favourite blog or magazine
* Request or build a package for your favourite distribution (if it is
not already there)
* Invite me for your next conference

If you use GNU Parallel for research:

* Please cite GNU Parallel in you publications (use --bibtex)

If GNU Parallel saves you money:

* (Have your company) donate to FSF

= 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.

= About GNU Niceload =

GNU niceload slows down a program when the computer load average (or
other system activity) is above a certain limit. When the limit is
reached the program will be suspended for some time. If the limit is a
soft limit the program will be allowed to run for short amounts of
time before being suspended again. If the limit is a hard limit the
program will only be allowed to run when the system is below the

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