Autofill "y" in for loop in bash

Asked Oct 20 '22 at 15:30

Active Oct 20 '22 at 15:30

Viewed 41 times

I'm very new to bash and I'm trying to run script in python I have. When the script runs, the first thing it prompt is y/n question, and I would like to automate this part so I can run it automatically without this part.

Based on this post, I have tried to autofill it with the following script:

(.venv) reut@whatever:~/git/my_amazing_script$ echo -e "y\ny\ny\ny"; for year in $(seq 20
17 1 2020) ;do python3 ./my_nice_script.py -start_year $year  -end_year $year ;done
>>>
y
y
y
y
Will process with the following parametersstart_year=2017, end_year=2017,
Please confirm [y/n].

As it can be seen, when it runs, it prints first all the y and then prompt again the y/n question.

I would like my script to run and autofill the y/n so I don't need to type and it can iterate. How can I do that?

asked Oct 20 '22 at 15:30

Reut

Any reason you can't just pipe yes into it? – Toby Speight Oct 20 '22 at 15:31
@TobySpeight it takes long time to run and I want to leave it without checking every 20 minutes if it prompted the y/n question and click on y for it to start the next loop – Reut Oct 20 '22 at 15:32
why do you need to do it in a loop? – aviro Oct 20 '22 at 15:32
3

I think what @TobySpeight meant, was to pipe "y" into the python command. echo "y" | python3 ./my_nice_script.py -start_year $year -end_year $year – aviro Oct 20 '22 at 15:35
1

@aviro, I'm pretty sure they meant yes | python3 ... – ilkkachu Oct 20 '22 at 15:39
2

@Reut, what you're doing there is just running echo before the Python script, without any redirections. It'll just print to the terminal, same as you ran echo hello any other time. You're looking for the pipe operator |. – ilkkachu Oct 20 '22 at 15:40
See What are the shell's control and redirection operators? – ilkkachu Oct 20 '22 at 15:40
@Reut, that's what yes is for - read its man page. In your example, you would write yes | python3 ./my_nice_script.py … – Toby Speight Oct 20 '22 at 15:56
You want echo … | for …, not echo … ; for …. Similarly with yes you want yes | …, not yes ; …. – Kamil Maciorowski Oct 20 '22 at 16:10
1

Is it your python script? If so, consider giving it an option to bypass the confirmation. If not, look to see if it already has such an option! – frabjous Oct 20 '22 at 21:05
@aviro I have tried your solution and it works for the first iteration but the for the 2nd it stops and doesn't automatically echo "y" – Reut Oct 21 '22 at 13:03

Autofill "y" in for loop in bash

0 Answers0