Way to update a variable in a shell script?

[csm10495]

Similar to: https://github.com/orgs/dbeaver/discussions/12500

I have a weird setup where i need to run some commands to setup access to a DB. Ultimately after that, i would connect on localhost:<some port>.

Is there a way i can have a shell command update the port (or other variables) via running something in "Before Connect"?