Enter a question mark at a view prompt to display the first keyword of every command available in
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the view. For example:
<Sysname> ?
User view commands:
archive
backup
boot-loader
...
Enter a space and a question mark after a command keyword to display all available, subsequent
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keywords and arguments.
If the question mark is in the place of a keyword, the CLI displays all possible keywords, each
with a brief description. For example:
<Sysname> terminal ?
debugging
logging
monitor
tracing
If the question mark is in the place of an argument, the CLI displays the description of the
argument. For example:
<Sysname> system-view
[Sysname] interface vlan-interface ?
<1-4094>
[Sysname] interface vlan-interface 1 ?
<cr>
[Sysname] interface vlan-interface 1
<1-4094> is the value range for the argument. <cr> indicates that the command is complete
and you can press Enter to execute the command.
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Enter an incomplete keyword string followed by a question mark to display all keywords starting
with that string. For example:
<Sysname> f?
fdisk
fixdisk
format
free
ftp
<Sysname> display ftp?
ftp
ftp-server
ftp-user
Using the undo form of a command
Most configuration commands have an undo form for the following:
Canceling a configuration.
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Restoring the default.
Disabling a feature.
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Archive configuration
Backup the startup configuration file to a TFTP server
Set boot loader
Enable to display debugging logs on the current terminal
Display logs on the current terminal
Enable to display logs on the current terminal
Display traces on the current terminal
Vlan-interface interface number
3