how to save data via export in python program?

Question

I want to automate a specific task, and I have a bash file that I want to read data from user arguments by running the script

bash my_script.sh /etc/??? path/dst

till now, I'm getting the data in my script by access to positional parameters ($1, $2) and variables, and that's fine.

But inside the script, I want to run a python program. So...

python test.py arg1 arg2 arg3

the things is, I have to read the data via python and access the output in my_script.sh

There is a constraint that I shouldn't create a file on the system. So I wonder about using export, but export is volatile since it's storing the variable till that process is opened and when I get back to my_script.sh, there isn't any clue of that data also I have no privilege to write my variable, and it's data on ~/.bashrc.

Also, I have read this and this, but they don't work the way I wanted.

if you regard the way I'm doing it, is wrong, let me know, please.

It's not clear what you are asking. Your script can capture or otherwise parse the output of test.py as it writes to standard output. — chepner
– chepner, Commented Aug 14, 2019 at 16:02
The python app that I want to run inside the script is not dependent on the script. Also in the script, I want to have access to data I processed in python app, as I said export can save any data for me but it's not accessible after the line of executed python app, I mean in the rest of the script I have no access to export variables. Can I parse the standard output? How? — amkyp
– amkyp, Commented Aug 14, 2019 at 16:18
output=$(python test.py arg1 arg2 arg3), then do what you want with $output. export only passes information from a parent to a child process, not the other direction. — chepner
– chepner, Commented Aug 14, 2019 at 16:27

amkyp · Accepted Answer · 2021-05-27 13:42:33Z

1

Thanks to @chepners comment, the solution was using $() instead of using export.

As it's mentioned in comments :

export only passes information from a parent to a child process, not the other direction.

So one of the correct ways to get an output from other application within your script is as follows:

output=$(python test.py arg1 arg2 arg3)

edited May 27, 2021 at 13:42

answered May 27, 2021 at 12:27

amkyp

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