How to use GNU parallel with shell script while loop

Question

I am currently trying to use GNU parallel tool. I put two parameters. First one is java class file and second one is text file which contains the list of java methods.

cat $2 | while read line
do
    $ROOT_DIR/DRIVER_NAME $1 $line
done

And I want to use driver in parallel. How can I make this task in parallel using GNU parallel?

Mark Setchell · Accepted Answer · 2020-04-20 14:05:21Z

1

If your classes.txt file looks like this:

class1
class2
class3

Then, I assume you want something like this:

parallel --dry-run $ROOT_DIR/DRIVER_NAME "param1" < classes.txt

answered Apr 20, 2020 at 14:05

Mark Setchell

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2 Comments

ChangHyeon Over a year ago

I think I wrote quite vague. First parameter is not class.txt format. It is literally java class file.

Mark Setchell Over a year ago

If you click edit under your question and improve it, I'll improve my answer to match.

Ole Tange · Accepted Answer · 2020-04-20 21:11:26Z

1

cat $2 | parallel $ROOT_DIR/DRIVER_NAME $1 {}

Consider reading chapter 1-2 of https://doi.org/10.5281/zenodo.1146014 Your command line will love you for it.

answered Apr 20, 2020 at 21:11

Ole Tange

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