2-12 CLI FeaturesThis section covers the following topics:z Introduction to CLIz Online Help with Command Linesz Synchronous Information Outputz Undo Form of a Commandz Editing Featuresz CLI Displayz Saving History Commandz Command Line Error InformationIntroduction to CLICLI is an interaction interface between devices and users. Through CLI, you can configure your devicesby entering commands and view the output information and verify your configurations, thus facilitatingyour configuration and management of your devices.CLI provides the following features for you to configure and manage your devices:z Hierarchical command protection where you can only execute the commands at your own or lowerlevels. Refer to Configuring User Privilege Levels and Command Levels for details.z Easy access to on-line help by entering “?”z Abundant debugging information for fault diagnosisz Saving and executing commands that have been executedz Fuzzy match for convenience of input. When you execute a command, you can input part of thecharacters in a keyword. However, to enable you to confirm your operation, the command can beexecuted only when you input enough characters to make the command unique. Take thecommands save, startup saved-configuration, and system-view which start with s as anexample. To save the current configuration, you need to input sa at least; to set the configurationfile for next startup, you need to input st s at least; to enter system view, you need to input sy atleast. You can press Tab to complement the command, or you can input the complete command.Online Help with Command LinesThe following are the types of online help available with the CLI:z Full helpz Fuzzy helpTo obtain the desired help information, you can:1) Enter ? in any view to access all the commands in this view and brief description about them aswell. ?User view commands:backup Backup next startup-configuration file to TFTP serverboot-loader Set boot loader
