Cisco ASR1002-5G-SHA/K9 Software Guide - Page 34

Getting Help Chapter 2 Using Cisco IOS XE Software • Transfer files into or off of the router using remote access methods such as FTP, TFTP, SCP, and so on. The diagnostic mode provides a more comprehensive user interface for troubleshooting than previous routers, which relied on limited access methods during failures, such as ROMmon, to diagnose and troubleshoot IOS problems. The diagnostic mode commands are stored in the nonIOS packages on the Cisco ASR 1000 Series Routers, which is why the commands are available even if the IOS process is not working properly. Importantly, all the commands available in diagnostic mode are also available in privileged EXEC mode on the router even during normal router operation. The commands are entered like any other commands in the privileged EXEC command prompts when used in privileged EXEC mode. Getting Help Entering a question mark (?) at the CLI prompt displays a list of commands available for each command mode. You can also get a list of keywords and arguments associated with any command by using the context-sensitive help feature. To get help specific to a command mode, a command, a keyword, or an argument, use one of the commands listed in Table 2-4: Table 2-4 Help Commands and Purpose Command Purpose help Provides a brief description of the help system in any command mode. abbreviated-command-entry? Provides a list of commands that begin with a particular character string. (No space between command and question mark.) abbreviated-command-entry Completes a partial command name. ? Lists all commands available for a particular command mode. command ? Lists the keywords or arguments that you must enter next on the command line. (Space between command and question mark.) Finding Command Options This section provides an example of how to display syntax for a command. The syntax can consist of optional or required keywords and arguments. To display keywords and arguments for a command, enter a question mark (?) at the configuration prompt or after entering part of a command followed by a space. The Cisco IOS XE software displays a list and brief description of available keywords and arguments. For example, if you were in global configuration mode and wanted to see all the keywords or arguments for the arap command, you would type arap ?. The symbol in command help output stands for "carriage return." On older keyboards, the carriage return key is the Return key. On most modern keyboards, the carriage return key is the Enter key. The symbol at the end of command help output indicates that you have the option to press Enter to complete the command and that the arguments and keywords in the list preceding the symbol are optional. The symbol by itself indicates that no more arguments or keywords are available and that you must press Enter to complete the command. Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 2-8 OL-16506-10