GNU Parallel 20260622 ('Rape Gang Inquiry') has been released. It is
available for download
at: lbry://@GnuParallel:4
Quote of the month:
GNU Parallel is much nicer than xargs and more powerful ...
definitely recommended!
-- boomertsfx@reddit
New in this release:
* testsuite reorganized.
* Bug fixes and man page updates.
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 Paral
lel 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 j
ob 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 UR
Ls, or a list of tables. A job can also be a command that reads from a
pipe. GNU Parallel ca
n 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 i
s 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 severa
l 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 in
put for other programs.
For example you can run this to convert all jpeg files into png and
gif files and have a pro
gress 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 c555f616391c6f7c28bf938044f4ec50
12345678 c555f616 391c6f7c 28bf9380 44f4ec50
$ md5sum install.sh | grep 707275363428aa9e9a136b9a7296dfe4
70727536 3428aa9e 9a136b9a 7296dfe4
$ sha512sum install.sh | grep b24bfe249695e0236f6bc7de85828fe1f08f4259
83320d89 f56698ec 77454856 895edc3e aa16feab 2757966e 5092ef2d 661b8b45
b24bfe24 9695e023 6f6bc7de 85828fe1 f08f4259 6ce5480a 5e1571b2 8b722f21
$ 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 dif
ferent 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 (d
atabase 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 DBURL
s, ;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 t
ime. If the limit is a soft limit the program will be allowed to run
for short amounts of ti
me before being suspended again. If the limit is a hard limit the
program will only be allow
ed to run when the system is below the limit.
