In this section we would cover advance linux commands used by system administrator. We would start from vi editor. You can use gedit [available in GUI mode] or vim editor, but we would focus on vi editor. You are preparing for RCHE exam and you should be able to use vi editor. During the exam you have to perform several system maintenance related task and in maintenance mode vi is only the available editor. Later in this section we would cover commands which require in system administration commands.