Run a shell script on a screen in parallel and serially at the same time

Question

I have 3 commands I want to run within a shell script within a GNU screen.

The following is the content from script.sh .

counter=$((counter + 1))
screen -dmS $counter sh -c \
"command1;exec bash;\
python3 script2.py ${word};exec bash &&\
command3;exec bash"

When I run ./script.sh . I want to run command1 first, then python3 script2. I only want to run command3 after python3 script2 is done.

I want to be able to open the screen and check on the python3 script2 process until it finishes that's why I'm doing it this way.

But I can see that command 1 and command 3 are being run simultaneously.

What's the right way to do this code?

Answer 1

Because there is "," between python3 script2.py ${word} and exec bash . it will execute exec bash without waiting for the completion of script2.

exec bash will complete immediately and invoke command 3 before the completion of script2

I have made following change

"command1 ; exec bash;\
python3 script2.py ${word} && exec bash ;\
command3;exec bash"