Category: News

GNU Parallel 20230622 (‘Nova Kakhovka’) has been released. It is available for download at: lbry://@GnuParallel:4

Quote of the month:

  gnu parallel is actually like. really easy

    — tom (era) @slimefiend@twitter

New in this release:

• Bug fixes and man page updates.

News about GNU Parallel:

• Building an (Evil) Android Phone Bot Army http://blog.faucher.net/2023/05/building-evil-android-phone-bot-army.html

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

If you like GNU Parallel record a video testimonial: Say who you are, what you use GNU Parallel for, how it helps you, and what you like most about it. Include a command that uses GNU Parallel if you feel like it.

About GNU Parallel

GNU Parallel is a shell tool for executing jobs in parallel using one or more computers. A job 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.

For example you can run this to convert all jpeg files into png and gif files and have a progress bar:

  parallel –bar convert {1} {1.}.{2} ::: *.jpg ::: png gif

Or you can generate big, medium, and small thumbnails of all jpeg files in sub dirs:

  find . -name ‘*.jpg’ |

    parallel convert -geometry {2} {1} {1//}/thumb{2}_{1/} :::: – ::: 50 100 200

You can find more about GNU Parallel at: http://www.gnu.org/s/parallel/

You can install GNU Parallel in just 10 seconds with:

    $ (wget -O – pi.dk/3 || lynx -source pi.dk/3 || curl pi.dk/3/ ||

       fetch -o – http://pi.dk/3 ) > install.sh

    $ sha1sum install.sh | grep 883c667e01eed62f975ad28b6d50e22a

    12345678 883c667e 01eed62f 975ad28b 6d50e22a

    $ md5sum install.sh | grep cc21b4c943fd03e93ae1ae49e28573c0

    cc21b4c9 43fd03e9 3ae1ae49 e28573c0

    $ sha512sum install.sh | grep ec113b49a54e705f86d51e784ebced224fdff3f52

    79945d9d 250b42a4 2067bb00 99da012e c113b49a 54e705f8 6d51e784 ebced224

    fdff3f52 ca588d64 e75f6033 61bd543f d631f592 2f87ceb2 ab034149 6df84a35

    $ bash install.sh

Watch the intro video on http://www.youtube.com/playlist?list=PL284C9FF2488BC6D1

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

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

O. Tange (2018): GNU Parallel 2018, March 2018, https://doi.org/10.5281/zenodo.1146014.

If you like GNU Parallel:

• Give a demo at your local user group/team/colleagues
• Post the intro videos on Reddit/Diaspora*/forums/blogs/ Identi.ca/Google+/Twitter/Facebook/Linkedin/mailing lists
• Get the merchandise https://gnuparallel.threadless.com/designs/gnu-parallel
• 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 programs that use GNU Parallel for research:

• Please cite GNU Parallel in you publications (use –citation)

If GNU Parallel saves you money:

• (Have your company) donate to FSF https://my.fsf.org/donate/

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 limit.

Apple today announced the availability of new software tools and technologies that enable developers to create groundbreaking app experiences for Apple Vision Pro — Apple’s first spatial computer. Featuring visionOS, the world’s first spatial operating system, Vision Pro lets users interact with digital content in their physical space using the most natural and intuitive inputs possible — their eyes, hands, and voice. Starting today, Apple’s global community of developers will be able to create an entirely new class of spatial computing apps that take full advantage of the infinite canvas in Vision Pro and seamlessly blend digital content with the physical world to enable extraordinary new experiences. With the visionOS SDK, developers can utilize the powerful and unique capabilities of Vision Pro and visionOS to design brand-new app experiences across a variety of categories including productivity, design, gaming, and more. I’m genuinely interested to see if third party developers can come up with better use cases for Apple’s VR headset than Apple itself did.

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This is how it all started, as Emily Eavis opened the gates to Glastonbury 2023 for the first fans – as we asked them how long they’d been waiting, who they were most looking forward to seeing, hopes for any secret sets, and their one top Glasto tip

Thor is a great way to write simple CLIs like one-off Rails scripts, but it does have its own gotchas. Here’s how to use Thor in practice. https://mattbrictson.com/blog/rails-tasks-with-thor

A major rewrite of pfsync(4), the state table synchronization tool for redundant pf(4) setups is in the works.

In a recent message to tech@, David Gwynne (dlg@) describes the multi-year process behind the diff contained in the message,

moving pf forward has been a real struggle, and pfsync has been a
constant source of pain. we have been papering over the problems
for a while now, but it reached the point that it needed a fundamental
restructure, which is what this diff is.

i started rewriting pfsync (again) during h2k22 last year, and it's
only been in the last couple of months that i got all the existing
functionality working again, and it's only been the last three weeks in
particular that it's been solid. this is the first time since about
openbsd 6.9 that i've been able to upgrade my production firewalls
without them falling over.

which means there may still be rough edges, but testing by brave souls is encouraged. There are huge potential performance gains to be found if this works out right.

You can read the entire message (with the diff) here, or just take in the rest of the text after the fold.

Read more…