call bash/terminal command with QT

I am a newer Qt Programming. I want to make a program with 1 lineedit and 1 textedit. when i write a command bash (example "man cat") and press enter, then textedit show output from this command (from this example, then text show manual about cat). How to solve this problem ?

how to call other program from qt. example i want to open gimp program from Qt program. what command to call other program.
thank for your attention

You might have searched the forum. The question has already been asked multiple times. The answer for your problem is to use QProcess.