create a task manager using shell script and GUI

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http://www.linuxquestions.org – i want to create an apps, that is task manager using shell-script and Graphical user interface(GUI) in Linux operating system.I have no idea about GUI package in Linux Operating system.Now my question is which GUI package i can use for creating for Task manager. if anyone have an idea regarding this,please help me!! Thanks!! (HowTos)