Running mulitple nodes from a Bash file

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I have single C++ code which gets the node name from the arguments passed to the main function. This is so that I can use the same code to run multiple nodes.
Is there a way to run multiple nodes in a single script file? Where the name of node is assigned when the main is executed?

rosrun machine sensors sens1 1

This needs to be run for different inputs on different terminals. I tried using a single .sh file, but until the first node exits, the next one isn't started. Is there a way to bypass this issue such that I can run multiple nodes using a single script on multiple terminals?