Bash while loop calling a Python script

Question

I would like to call a Python script from within a Bash while loop. However, I do not understand very well how to use appropriately the while loop (and maybe variable) syntax of the Bash. The behaviour I am looking for is that, while a file still contains lines (DNA sequences), I am calling a Python script to extract groups of sequences so that another program (dialign2) can align them. Finally, I add the alignments to a result file. Note: I am not trying to iterate over the file. What should I change in order for the Bash while loop to work? I also want to be sure that the while loop will re-check the changing file.txt on each loop. Here is my attempt: ``` #!/bin/bash # Call a python script as many times as needed to treat a text file c=1 while [ `wc -l file.txt` > 0 ] ; # Stop when file.txt has no more lines do echo "Python script called $c times" python script.py # Uses file.txt and removes lines from it # The Python script also returns a temp.txt file containing DNA sequences c=$c…

Accepted Answer

No idea why you want to do this.

```
c=1
while [[ -s file.txt ]] ; # Stop when file.txt has no more lines
do
    echo "Python script called $c times"
    python script.py # Uses file.txt and removes lines from it
    c=$(($c + 1))
done
```

Bash while loop calling a Python script

Solution

Problem