Bash Script to Open a Shell, Run a Command in the Shell, & Keep Shell Running

Question

I'm trying to automate these steps using a bash script

Run a command to access the shell of a program (bash shell of a Kubernetes pod)
```
kubectl exec --stdin --tty hello-node-7567d9fdc9-zvz55 -- bash
```

In this shell, run a second command (eg. python)

root@hello-node-7567d9fdc9-zvz55:/# python

Python 3.7.4 (default, Aug 13 2019, 15:17:50) 
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

Keep the shell open/running in the foreground (so more commands can immediately be entered by a user into the python shell started in step 2)

I'm able to do the first step described above using the script below. How do we do the second and third step?

#! /bin/bash
bash -c 'kubectl exec --stdin --tty hello-node-7567d9fdc9-zvz55 -- bash'

Or use python -c 'print("hello from python"); print ("hi")' for supplying multiple python commands — P....
– P...., Commented Sep 29, 2021 at 20:34
You can try to run individual commands in a pod, also can be useful to check this answer. — Nadia Espinosa
– Nadia Espinosa, Commented Sep 29, 2021 at 21:51
You can replace bash -c 'kubectl …' with just kubectl …: there’s absolutely no reason to spawn yet another shell process inside your shell script. — Konrad Rudolph
– Konrad Rudolph, Commented Sep 30, 2021 at 15:17

Shaqil Ismail · Accepted Answer · 2021-09-30 14:11:30Z

0

For step 2 you can use the nohup command to run a process and even if the user logs off the process does not get killed. Afterwards the shell is kept running for you to perform step 3

answered Sep 30, 2021 at 14:11

Shaqil Ismail

1,9891 gold badge7 silver badges6 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Athena Wisdom Over a year ago

I'll like the bash script to run steps 1-3 and end up with the python shell open in the foreground. I think nohup keeps the process running but keeps it in the background

Shaqil Ismail Over a year ago

Ok so once you have the interactive Bash session which is step 1 you can start Python. If Python is not installed, you can install Python as normal, as if you had a normal Linux server and you have logged in.

Collectives™ on Stack Overflow

Bash Script to Open a Shell, Run a Command in the Shell, & Keep Shell Running

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related