在bash中使用grep时，将带有交互的命令的输出放在变量中

This program I use has it's own variables to set when you run it, so I want to set those variables and then greping the output then storing it inside a variable. However, I don't know how to go about this the correct way. The idea I have doesn't work. The focus is on lines 7 through 14.This program I use has it's own variables to se