Unix shell script start tomcat server(JVM) and exit

I guess

killall -9 <your_script_name> 

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would kill all previous instances of the script.

To restart your code should be something like that:

java <parameters> <your_program_name> &

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Please mind
the trailing ampersand which will put your program on background.

I have a shell script to start a tom cat server. Right now it waits until it trying to start the server and does not exit. Wondering what unix cmd to add to wait for 3 mins if start cmd is hung ?

I mean wait for 3 mins and if does not start exit shell script

for now I'm planning to take care killing part manually

You use the sleep command to wait for some time, like sleep 180 to wait 3 minutes (this is quite a long time for tomcat to start actually). After waiting I would suggest you use a command line browser to see if your tomcat is working (lynx). If you don't get a reply then use the ps command with some filtering to find and kill leftover processes. How exactly are you starting your tomcat?