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Command Line Interface 29
command buffer is defaulted as 10. That is, the command line interface stores 10
history commands for each user. The operations are shown in
Table 7 .
Cursor keys can be used to retrieve the history commands in Windows 3.X
Terminal and Telnet. However, in Windows 9X HyperTerminal, the up and down
cursor keys and do not work, because Windows 9X HyperTerminal defines the two
keys differently. In this case, use the combination keys <
Ctrl+P > and < Ctrl+N >
instead for the same purpose.
Common Command Line Error Messages
Incorrectly entered commands will cause error messages to be reported to users.
The common error messages are listed in
Table 8 .
Editing Characteristics of Command Line
The command line interface provides basic command editing and supports the
editing of multiple lines. A command cannot be longer than 256 characters. See
Table 9 .
Table 7 Retrieving History Command
Operation Key Result
Display history command
display
history-command
Display history command by
user inputting
Retrieve the previous history
command Up cursor key <> or <Ctrl+P> Retrieve the previous history
command, if there is any.
Retrieve the next history
command Down cursor key <> or
<Ctrl+N> Retrieve the next history
command, if there is any.
Table 8 Common Command Line Error Messages
Error messages Causes
Unrecognized command
■
Cannot find the command
■
Cannot find the keyword
■
Wrong parameter type
■
The value of the parameter exceeds the range
Incomplete command
The command is incomplete.
Too many parameters
Too many parameters have been entered.
Ambiguous command
The parameters entered are not specific.
Table 9 Editing Functions
Key Function
Common keys Insert from the cursor position and the cursor moves
to the right, if the edition buffer still has free space.
Backspace Delete the character preceding the cursor and the
cursor moves backward.
Leftwards cursor key <> or <Ctrl+B> Move the cursor a character backward
Rightwards cursor key <> or <Ctrl+F> Move the cursor a character forward
Up cursor key <> or <Ctrl+P>
Down cursor key <> or <Ctrl+N>
Retrieve the history command.