Cisco IOS Wide-Area Networking Configuration Guide - Free Books

Using the Command-Line Interface in Cisco IOS and Cisco IOS XE SoftwareUsing the CLITo use one of these output modifiers, type the command followed by the pipe symbol (|), the modifier,and the regular expression that you want to search for or filter. A regular expression is a case-sensitivealphanumeric pattern. It can be a single character or number, a phrase, or a more complex string.The following example illustrates how to filter output of the show interface command to display onlylines that include the expression “protocol.”Router# show interface | include protocolFastEthernet0/0 is up, line protocol is upSerial4/0 is up, line protocol is upSerial4/1 is up, line protocol is upSerial4/2 is administratively down, line protocol is downSerial4/3 is administratively down, line protocol is downUnderstanding CLI Error MessagesYou may encounter some error messages while using the CLI. Table 5 shows the common CLI errormessages.Table 5Common CLI Error MessagesError Message Meaning How to Get Help% Ambiguous command:“show con”You did not enter enoughcharacters for the command tobe recognized.% Incomplete command. You did not enter all thekeywords or values requiredby the command.% Invalid input detected at “^”marker.You entered the command incorrectly.The caret (^) marksthe point of the error.Reenter the command followed by aspace and a question mark (?). Thekeywords that you are allowed toenter for the command appear.Reenter the command followed by aspace and a question mark (?). Thekeywords that you are allowed toenter for the command appear.Enter a question mark (?) to displayall the commands that are available inthis command mode. The keywordsthat you are allowed to enter for thecommand appear.For more system error messages, see the following documents:• Cisco IOS Release 12.2SR System Message Guide• Cisco IOS System Messages, Volume 1 of 2 (Cisco IOS Release 12.4)• Cisco IOS System Messages, Volume 2 of 2 (Cisco IOS Release 12.4)xi