by Ciro Santilli (@cirosantilli, 34)
The author Ole Tange answers every question about it on Stack Exchange. What a legend!
This program makes you respect GNU make a bit more. Good old make with -j can not only parallelize, but also take in account a dependency graph.
Some examples under: 
man parallel_exampes
To get the input argument explicitly job number use the magic string {}, e.g.: 
printf 'a\nb\nc\n' | parallel echo '{}'
sample output: 
a
b
c
To get the job number use {#} as in: 
printf 'a\nb\nc\n' | parallel echo '{} {#}'
sample output: 
a 1
b 2
c 3
c 3
{%} contains which thread the job running in, e.g. if we limit it to 2 threads with -j2: 
printf 'a\nb\nc\nd\n' | parallel -j2 echo '{} {#} {%}'
sample output: 
a 1 1
b 2 1
c 3 2
d 4 1
The percent must be a reference to "split the inputs module the number of workers", and modulo uses the % symbol in many programming languages such as C.
To pass multiple CLI argments per command you can use -X e.g.: 
printf 'a\nb\nc\nd\n' | parallel -j2 -X echo '{} {#} {%}'
sample output: 
a b 1 1
c d 2 2

Ancestors (10)

  1. List of command line utilities
  2. Command line utility
  3. Command-line interface
  4. Computer user-interface
  5. Software
  6. Computer
  7. Information technology
  8. Area of technology
  9. Technology
  10. Home

Incoming links (1)

View article source

Discussion (0)

New discussion

There are no discussions about this article yet.

Articles by others on the same topic (0)

There are currently no matching articles.
See all articles in the same topic Create my own version