# SPDX-FileCopyrightText: 2021-2022 Ole Tange, http://ole.tange.dk and Free Software and Foundation, Inc.
# SPDX-License-Identifier: GFDL-1.3-or-later
# SPDX-License-Identifier: CC-BY-SA-4.0
 
Quote of the month:



--line-buffer, a flag
parallel, now more precise
Output is in sync


write a haiku about gnu parallel and the :::+  option


  Got around to using GNU parallel for the first time from a suggestion by @jdwasmuth ... now I'm wishing I started using this years ago
    -- Stefan Gavriliuc @GavriliucStefan@twitter

  I’m a big fan of GNU parallel!
    -- Scott Cain @scottjcain@twitter

  gnu parallelが便利すぎてxargsの使い方忘れちゃった
    -- @mathbbQ@twitter ℕ@凍結解除手続き中

  Doing some absolutely bonkers "data science" on the command line. GNU parallel + JQ is very powerful, allowing me to parse and 10Gig-JSON-File in under a minute.
    -- @jeeger@twitter Keter-class developer

  I've learned a lot during my internship, but getting even slightly more proficient with GNU parallel is probably the most important thing I've learned...
    -- Elijah Rippeth @terrible_coder@twitter

  I honestly don't know how I'd survive without @Docker and @GNU_Parallel
    -- Eric Pauley @EricPauley_@twitter

  Gnu parallel is indeed slick. I always try to align my data to make it possible to loop over it with a nice for loop added in a call to run the jobs in parallel then becomes super easy. I love the {1..99} syntax in bash.
    -- ragsofx

  xargs諦めてGNU Parallel使ったら一瞬で問題が解決したので終わり
    -- aria_moto @moto_aria@twitter

  Such a life saver of a tool.
    -- winrid@ycombinator
  
  I used GNU Parallel to run a script locally that did what a big distributed system did, quicker and more reliably. It got to the point where people would just ask me to "run the thing" on my laptop instead of waiting for the cron.
    -- winrid@ycombinator
  
  parallel is so useful and i use it multiple times daily.
    -- arrakeen@ycombinator
  
  GNU Parallel is one of my favorite utilities of all time.
    -- paskozdilar@ycombinator

  Tool, was ich sehr ausgiebig nutze inzwischen und lieben gelernt habe: "GNU parallel"
    -- nuit @nv1t@twitter

  아 parallel 너무 좋지요.
    -- 어엉부엉@d_ijk_stra

  GNU parallel すごいな、シェルスクリプトを make -jX みたいにして並列
  に走らせたいときに超便利
    -- びーる @debugordie@twitter

  GNU parallel いいよ、大量のデータファイルをスクリプトで処理する人とかにマジおすすめ
    -- びーる @debugordie@twitter

  Igual @GnuParallel te puede echar una mano. Te permite pensar y
  programar en serie pero ejecutar en paralelo usando cores de una
  máquina o máquinas remotas. Una vez que lo has usando te lamentas no
  haberlo conocido antes :)
    -- Juan Sierra Pons @juasiepo

  If I could only keep 5 GNU utils, parallel would make it to the list
  :)
    -- 5heikki@reddit

  Gnu Parallel: installed in every computer i have access to.
    -- raffaele messuti @atomotic@twitter

  gnu parallel is a good program
    -- Pwn A. Day @pwnaday@twitter

  Deus salve o gnu parallel
    -- marcos @guv_Tuv@twitter

@a
4
  اليوم علمت بأداة تساعد على تشغيل أوامر الصدفة بشكل متوازي حسب عدد الأنوية الموجودة مما يجعلها أداة أساسية في عدة تنفيذ المهام.
  الأداة اسمها gnu parallel
    -- @AbuEsra2014@twitter زايد السعيدي

  GNU parallel is very easy to use and has many features for
  specialized use cases. It’s a Perl script.
    -- @harlekyn@twitter uʎʞǝlɹɐɥ 

  GNU parallelという神ツールを発見した
    -- @schnell1232@twitter

  How I love GNU parallel 
    -- @dathanvp@twitter Dathan Pattishall

  GNU Parallelめっちゃ便利で偉い
    -- аiгbus @airbus_P

  I really liked GNU Parallel http://gnu.org/software/parallel/
  one of the best tool to execute parallel jobs in the shell
    -- Luca Molteni @volothamp@twitter

  Have you heard of our lord and saviour GNU parallel?
    -- kxyne @Kxyne@twitter

  Installing GNU parallel is the second thing I do on any new Linux
  machine, right after uninstalling pulseaudio.
    -- Andy Cooper @integgroll@twitter

  Parallel is amazing!
    -- fatboy93@reddit

  parallel is my new kink
    -- python_noob_001@reddit

  @GnuParallel the best thing ever and it's not up for debate #EOchat
    -- Nathan Thomas @DrNASApants@twitter

  Using [GNU Parallel is] super easy if you use xargs, and it is magic for making things multi-process. Then adding in the ssh magic it can do it is an incredible tool that is completely underutilized.
     -- Ancients @Ancients@twitter

  GNU Parallel is one of the most helpful tools I've been using recently, and it's just something like: parallel -j4 'gzip {}' ::: folder/*.csv
     -- Milton Pividori @miltondp@twitter

  This is a fantastic tool, and I wish I had upgraded from xargs years ago!
    -- Stuart Anderson

  GNU Parallel and ripgrep would be your friend here.
    -- CENAPT @cenaptech@twitter

  GNU Parallel is great
    -- Newton's Flaming Laser Sword @swordgoesfwoosh@twitter

  Try GNU parallel it's awesome, and exactly the thing you are looking for. It allows you to set number of processes running among many things. I use it a lot, and can't recommend it enough.
    -- mapettheone@reddit

  It's really quite amazing how powerful and flexible it is
    -- schwanengesang @tensegrist@twitter

  Every time I install @ubuntu, one of the first tools I install is
  @gnuparallel. I love it.
    -- Necati Demir @ndemir@twitter

  Today I'm grateful for GNU parallel, especially with the --colsep and
  --jobs parameters #GiveThanks
    -- Erin Young @ErinYoun

  It's not a data migration party until GNU Parallel is involved...
  involved
  involved
    -- rrees @rrees@twitter

  I have gotten a *ton* of mileage out of jq, awk, and GNU parallel,
  even at multi-GB sizes.
    -- Eric Wolak @ericthewolak@twitter 

GNU parallel, which works a little bit like xargs, but has a much more friendly way of handling files with spaces and automatically parallelises calls. This tool has saved me a great deal of coding because it makes it so easy to write a program which does just one part of a task and then run it in parallel with load balancing and a nice progress bar. I cannot recommend this tool enough.

https://negfeedback.blogspot.com/2020/05/indispensable-command-line-tools.html

  GNU parallel all the way!
    -- David Manouchehri @DaveManouchehri@twitter

  I found GNU Parallel and it's awesome.
    -- Teddy Choi @TeddyJChoi@twitter

  Well anyway, It was blazingly fast and astonished by performance. Guess I'll never use xargs.
    -- (Not) Akaming @_Akamig@twitter

  Yeah, GNU parallel is a beast when used accordingly.
    -- @lsde@twitter

  GNU Parallel is awesome
    -- Gaurav Jain @gauravjain49@twitter
  
  My new favourite command line tool is GNU Parallel. After knowing it for a while I just recently came back to it for a refactor of a script and now I've changed like 4 different huge scripts into tiny parallel scripts that do their job literally 3 to 10 times faster and just [mind blown]
    -- Izzy @angry_izzy@twitter
  
  I love so much @GnuParallel to parallelize my SQL requests on @PostgreSQL
    -- @rmaziere_85 Romain
  
  GNU parallel really changed how I do a lot of data processing stuff
    -- Brendan Dolan-Gavitt @moyix@twitter
  
  Parallel is a life send, what an awesome piece of software.
    -- Blaze9@reddit.com
  
  It's really powerful for smallish data processing scripts
    -- João Veiga @jcsvveiga@twitter
  
  It's the MapReduce of our generation!
    -- Mathias Meyer @roidrage@twitter
  
  GNU parallel is a seriously powerful flexible and tool.
    -- Greg Hurrell @wincent@twitter

  [socat is] top3 on my "crazy and powerful" list (the other two being
  gnu parallel and emacs).
    -- Peter Kjellström @nsccap@twitter

  GNU/Parallel umm... tempting.
    -- k-leb k @dcatdemon@twitter

  Ain't that a dirty hack ;-)
    -- ./hans

  Not sure if it counts as an "alt" tool but GNU parallel really took my shell scripting game to the next level.
    -- @alinajaf@twitter

=== Used ===

  Praise GNU parallel, though. That gets me pretty far.
    -- Your Obed. Servant, J. B. @Jeffinatorator

  Colorful output
  parallel, with --color flag
  tasks more vibrant now
    -- ChatGPT

  GNU Parallel absolutely rocks.
    -- Austin Mordahl@Stackoverflow

  [GNU Parallel] is the most amazing tool ever invented for bioinformatics!
    -- Istvan Albert https://www.ialbert.me/

  If used properly, #gnuparallel actually enables time travel.
    -- Dr. James Wasmuth @jdwasmuth@twitter

  reduced our backend test pipelines from 4 to 1.30 hrs. gnu parallel for the win!!!
     -- Swapnil Sahu @CaffeinatedWryy@twitter

  Parallel is Good Stuff (tm)
    -- bloopernova@ycombinator

  The syntax for GNU Parallel is so slick that I often use it just to make my script read nicer, and the parallelism is a cherry on top.
    -- Epistaxis@reddit

  Parallel has been (and still is) super useful and simple tool for speeding up all kinds of shell tasks during my career.
    -- ValtteriL@ycombinator
  
  It's amazing how fast you can get with bash pipelines and GNU Parallel.
    -- Eric Pauley @EricPauley_

  Immensely useful which I am forever grateful that it exists.
    -- AlexDragusin@ycombinator
  
  My favorite software, ever. Keep the good work.
    -- Federico Alves @federicoalves@twitter 

  I also prefer gnu parallel. Mainly because it makes embarrassingly
  parallel tasks embarrassingly easy to run on the command line.
    -- Vincent D. Warmerdam @fishnets88@twitter

  I'm going to make GNU parallel my new superpower this year.
    -- Christian G. Warden @xn@twitter

My favorite man page is that of GNU parallel.
    -- Jeroen Janssens @jeroenhjanssens@twitter

  GNU parallel 便利すぎ
    -- @butagannen@twitter 豚顔面

  GNU parallel is a severely underrated tool for just spawning a
  shitload of tasks. I use it every day and fucking love it.
    -- Jane @serialexpjane@twitter

  Take a look at GNU Parallel. It’s magnificent.
    -- Siira@ycombinator.com

  Safe to say, @GnuParallel was a life changer during my PhD! It helped
  me optimise so many of my tasks and analyses.
    -- Parice Brandies @PariceBrandies@twitter

  We use gnu parallel now - and happier for it.
     -- Ben Davies @benjamindavies@twitter

  GNU Parallel makes my life so much easier.
  I'm glad I don't have to implement multi-threaded Python scripts on the regular.
     -- Fredrick Brennan @fr_brennan@twitter

  If you work with lots of files at once
  Take a good look at GNU parallel
  Change your life for the better
    -- French @notareverser@twitter

  GNU Parallel is your friend.
  Can shorten that time by X cores.
    -- iRODS @irods@twitter

  GNU Parallel is my new favorite thing
    -- Will Tejeda @thewilltejeda

  GNU Parallel is a priceless timesaver
    -- June "Wakalix" @TWakalix@twitter

  I think many people would be surprised to learn that GNU parallel is
  "just" a single Perl script.
    -- Peter Menzel @ptr_menzel@twitter

  GNU Parallel is my single favourite tool for batch processing data
  from the command line.
    -- Jeff Wintersinger @jwintersinger

  GNU parallel should be taught in class, it is one of the best tools
  to run grids of experiments
    -- no love deep learning @tetraduzione@twitter

  I get a weird sense of satisfaction every single time I see the
  lovely logo of #GNU Parallel (plus, what an underrated piece of
  great software!)
    -- Emre Sevinç @EmreSevinc@twitter

  My favorite man page is that of GNU parallel.
    -- Jeroen Janssens @jeroenhjanssens@twitter

  Gnu parallel is also awesome, fwiw.
    -- Rogan Dawes @RoganDawes@twitter

  With multicore systems everywhere GNU Parallel is a must have tool.
    -- Neil H. Watson @neil_h_watson@twitter
  
  Who needs spark when GNU Parallel exists
    -- MatthijsB @MatthijsBrs@twitter

  GNU Parallel: dead simple process-level parallelization of ad hoc
  tasks. Write for a chunk, let gnu manage the splitting, permutations
  and pool concurrency.
    -- Nick Ursa @nickursa@twitter

  I wish more command line software had example pages as robust as GNU Parallel
    -- Lucidbeaming @lucidbeaming

  GNU parallel is straight up incredible.
    -- Ben Johnson @biobenkj@twtter

  GNU parallel has helped me kill a Hadoop cluster before.
    -- Travis Campbell @hcoyote@twitter

  Parallel is the BEST command.
    -- Nick @NickInfoSec@twitter

  [L]earning about parallel was amazing for me, it gives us many beautiful solutions.
     -- SergioAraujo@stackoverflow

  I've said it before: The command line program GNU Parallel is a godsend.
    -- Jo Chr. Oterhals @oterhals

  IMHO, SQLite and GNU Parallel are among the world's great software.
    -- singe@reddit

  It is, beyond absolutely any doubt whatsoever, the single most
  important tool I use in making me a productive bioinformatician.
    -- A-N-Other@reddit.com
  
It is SUPER easy to speed up jobs from the command line w/ GNU parallel.
  -- B3n @B3njaminHimes@twitter

I want to make a shout-out for @GnuParallel, it's a work of beauty and power
  -- Cristian Consonni @CristianCantoro

Amazingly useful script!
  -- unxusr@reddit.com

Y'all need some GNU parallel in your lives
-- ChaKu @ChaiLovesChai@twitter


There are so many things to love about GNU parallel. You could honestly teach a whole parallel computing course with it and never have to leave it for a real language.
-- Aubrey Bailey @DNAvinci@twitter


With GNU Parallel you sure can!
I like getting things done

--Kyle Lady @kylelady@twitter

Ok! GNU Parallel is one of the best things out there. Almost as good as vanilla ice cream.
    -- @coffe@mastodon.art

HOLY STUFF I LOVE GNU PARALLEL
  -- Nick (but spookier) @NickInfoSec@twitter


What this country needs is a president with a strong understanding of GNU Parallel, Awk, Sed, Grep, and Diff
-- Gregg Housh @GreggHoush

I know I'm late to the party but GNU Parallel is truly amazing!
-- Sam Diaz-Munoz @sociovirology

GNU parallel is a thing of magic.
-- Josh Meyer @joshmeyerphd@twitter 

I've been using GNU Parallel very much and effectively lately.
Such an easy way to get huge speed-ups with my simple bash/Perl/Python
programs -- parallelize them!
-- Ken Youens-Clark @kycl4rk@twitter

Alias and vars
export them more easily
With env_parallel
-- Ole Tange

You know what?
GNU Parallel is cool.
Concurrency, but in the Unix-philosophy style,
without the Enterprise wankeriness.
-- NickM‏ bokkiedog@twitter

An ode to GNU parallel
An ode to GNU parallel
An ode to GNU parallel
An ode to GNU parallel
An ode to GNU parallel
An ode to GNU parallel
  -- Adam Stuckert PoisonEcology@twitter

--limit can
limit jobs dynamic'ly
given a command
  --ole-tange

--line-buffer
touches files on disk no more
faster than before
  -- Ole Tange

Always test your script
using a --dry-run
or --dr
  -- Ole Tange 

--rpl
used to be a static string
Now it can take args
  --ole-tange

--tee will pipe
all data to all the jobs
used with --pipe
  --ole-tange

Speed is good for you
Multi speed is better still
Use GNU Parallel
  -- Ole Tange
  
Want to monitor
many job outputs at once:
--tmuxpane
  --ole-tange

Pipes are fast and good.
Use them in your programs, too.
Use GNU Parallel
  -- Ole Tange

Programs using net
only spare capacity
niceload dash dash net
  -- Ole Tange

xapply too strict?
:::+
is just made for you
  -- Ole Tange

Save environment
Functions, vars and other stuff
Try env_parallel
  -- Ole Tange

Many jobs to sort.
SQL would help a lot.
Dash dash sql
  -- Ole Tange

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

|||||
|||||||
Use GNU Parallel
  -- Malcolm Cook

UNIX pipe too tight?
You should then learn dash dash pipe.
Use GNU Parallel
  -- Ole Tange

In parallel land
everything is quick and fast
Use GNU Parallel.
  -- Ole Tange

Jobs in parallel
faster run than single jobs
Use GNU Parallel.
  -- Ole Tange

Multi core I see.
Doing nothing. I say no!
Use GNU Parallel.
  -- Ole Tange

Programs very slow.
Multiple can run at once.
Use GNU Parallel.
  -- Ole Tange

Many jobs to run.
Idle cores is not your thing.
Use GNU Parallel.
  -- Ole Tange

SSH set up?
Instant cluster needed now?
Use GNU Parallel.
  -- Ole Tange

xargs' space and quote
headache causing behaviour.
Use GNU Parallel
  -- Ole Tange

If not enough time:
Run jobs using Parallel.
Keeps CPUs warm.
  -- Ole Tange

Hadoop bit too much?
Want a simpler syntax now?
Use GNU Parallel.
  -- Ole Tange

Shellshock pain hits us.
Dash dash env is affected.
Upgrade Parallel.
  -- Ole Tange

  goodbye to xargs
  quoting is still a black art
  welcome parallel
    -- Malcolm Cook

bash for loops vanquished 
jobs fan out over network 
collated results!
    -- Malcolm Cook

code fork headache blues? 
option P is your new friend 
`man parallel` now! 
-- Malcolm Cook

Are you tired of 
inflexible replacements? 
Use Perl expressions. 
-- Ole Tange