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I want to run several jobs in parallel using the a script that does serial calls to a parameterized script and submits it as a background job on each call. It's for a brute force script which on each call will run 1k of 10k total combinations.

The following is my first hack at it. 

#!/bin/bash for i in $(seq 10) do ./tmp/tmpsky/bd25Par.sh (i*1000-1000) (i*1000) & done

I want $1 to evaluate as 0,1000,2000 etc...and $2 to evaluate to 1000,2000,3000 etc.

The & is to submit the script as a background job. The called module will pass $1 and $2 to be used with seq as follows 

#/bin/bash/ for n in $(seq $1 1 $2) do ...`

The first script fails with unexpected token 'i*1000-1000'

What have I done wrong?

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  • This is what parallel is for. Commented Sep 28, 2016 at 4:16
  • @Theophrastus yes that seemed to work..! Commented Sep 28, 2016 at 4:33

1 Answer 1

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The first script fails with unexpected token 'i*1000-1000'

What have I done wrong?

The obvious error is that you are actually not calling the variable $i in your loop:

for i in $(seq 10) do ./tmp/tmpsky/bd25Par.sh (i*1000-1000) (i*1000) & done

It should be:

for i in $(seq 10) do ./tmp/tmpsky/bd25Par.sh ($i*1000-1000) ($i*1000) & done

Thus; use $i when using the variable. i in itself will not work.

As far as doing math in the shell, see comment number 2.

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