Chapter 1 What’s New for FortiOS 5.0 : Usability enhancements : Improved CLI syntax for multi-value fields
  
Improved CLI syntax for multi-value fields
Several new subcommands simplify editing of CLI fields that accept multiple values. This eliminates re-typing of lists of options, IP addresses, and so on, saving time and avoiding errors. You can simply add or remove individual items from the list.
Table 3: CLI subcommands for multi-value fields
 
append <field_name> <list>
Add one or more values to the list.
unselect <field_name> <list>
Remove one or more values from the list.
select <field_name> <list>
Select one or more values. This is the same as the set subcommand.
clear <field_name>
Reset the multi-value field to its default value. This is the same as the unset subcommand.
You can continue to use the set and unset subcommands on multi-value fields.
The new subcommands support command completion. For example, in the config system interface command, if you enter select ?, the response shows only the multi-value fields:
dhcp-relay-ip dhcp relay ip address
allowaccess Allow management access to the interface