Is there any smart service or ways to execute a shell script in a linux box from Appian ?
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If your installation is on-premise, then yes you should be able to write a smart service to do this - I did this years ago as a POC but no longer have the code unfortunately. If your installation is on Appian Cloud, I don't believe that code will be approved due to security restrictions.
You mean custom plugin approach?
I'm looking for similar use case executing remote shell script from Appian can you please confirm we can achieve this via Custom Plugin
A remote shell script, means you're running a shell script on another server. There are no plugins I am aware that can do ssh.
Probably best to just expose that function as an API and call that API from Appian.
Yes, Shell script is on different server. what are Appian capabilities to integrate(Partners software) like a Job Scheduling, Visualization tool
If it has an API, there's a good chance Appian can integrate with it.