|  | 3.1 | Router User Interface
| 3.1.4 | Using router help functions
Suppose you want to set the router clock. If you do not know the command to do so, use the help command to check the syntax for setting the clock. The following exercise illustrates one of the many functions of the help command. Your task is to set the router clock. Assuming that you do not know the command, proceed using the following steps: Use help to check the syntax for setting the clock. The help output shows that the clock command is required. Check the syntax for changing the time. Enter the current time by using hours, minutes, and seconds, as shown. The system indicates that you need to provide additional information to complete the command. The help output in Figure shows that the set keyword is required. Check the syntax for entering the time and enter the current time using hours, minutes, and seconds. As shown in Figure , the system indicates that you need to provide additional information to complete the command. Press Ctrl-P (or the up arrow) to repeat the previous command entry automatically. Then add a space and a question mark (?) to reveal the additional arguments. Now you can complete the command entry. The caret symbol (^) and help response indicate an error. The placement of the caret symbol shows you where the possible problem is located. To input the correct syntax, re-enter the command up to the point where the caret symbol is located and then enter a question mark (?). Enter the year, using the correct syntax, and press Return to execute the command. The user interface provides syntax checking by placing a ^ where the error occurred. The ^ appears at the point in the command string where you have entered an incorrect command, keyword, or argument. The error location indicator and interactive help system enable you to find and correct syntax errors easily. Note: Screen output varies, depending on Cisco IOS software level and router configuration.