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I am trying to write a bash for loop that execute a python script multiple times, such that it's like this 

for i from 1 to 10 do 
    arg1 = 'path/to/directory1'
    arg2 = 'path/to/directory2'
    script.py arg1 arg2 arg3 arg4 
    done

arg1 and arg2 are easy because they are static paths that remain consistent over time. However, arg3 and arg4 are values that I get from a csv I have and I want arg3 and arg4 to change at each iteration based on the row they are on.

So for a csv like this 

400 Steve
401 Jack
402 John
403 Jim
404 Jane
405 Joe 
406 Bob
407 Richard
408 Eric 
409 Tim
410 Marie

So the first iteration of the loop would be like this

script.py path/to/directory1 path/to/directory2 400 Steve
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  • Do you specifically want to stop after 10 iterations, or to continue until the end of the CSV file? Commented Apr 23, 2020 at 2:59
  • I'd like to continue to the end of the csv file.I was just throwing in th 10 in there as a placeholder Commented Apr 23, 2020 at 3:27

2 Answers 2

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To read and process all lines from the CSV file, you can use a while loop:

arg1='path/to/directory1'
arg2='path/to/directory2'

while IFS=, read -r arg3 arg4; do
    script.py "$arg1" "$arg2" "$arg3" "$arg4" 
done < file.csv
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(echo "column1,column2"; cat file.csv) | 
csv-exec -- script.py path/to/directory1 path/to/directory2 %column1 %column2

csv-exec is from https://github.com/mslusarz/csv-nix-tools

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