The following table summarizes the commands common to the User Exec, Priv Exec, Global Config modes, and all other configuration contexts:
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Common Commands

Command Description
clrscr Clears the display screen
commit Commits (saves) changes made in the current session
exit Ends and exits the current mode. In the Global cnfiguration mode, this command and moves to the PRIV EXEC mode.
help Displays the interactive help system
no Negates a command or reverts values to their default settings
revert Reverts changes to their last saved configuration
service Invokes service commands to troubleshoot or debug (config-if) instance configurations
show Displays running system information
write Writes the system's running configuration to memory or terminal