Menu Structure
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Appendix G: Menu Structure
The Command Prompt
When the user interface first starts the command prompt will be in the 'support' scope, and will
look like this:
DCP [support]$ _
This tells us which processor we are currently running (in this case the DCP - the number and
types of processors present depend on the gateway board) and that we are in the 'support'
scope.
Once privileged access has been granted (see the 'su' command, below) there will be a star
between the processor name and the scope field:
DCP*[support]$ _
Privilege mode prevents unauthorised access to commands which can potentially stop the
Gateway board working correctly. If you need access to commands outside the 'support' scope,
then use the 'su' command to grant access to privileged user mode. Always make sure you
leave privileged user mode when you are done. Use CTRL-D to log-off from privileged user
mode.
Executing Commands
To execute a command, type its name and any parameters at the command prompt and press
Enter. To find out about a command, either use the 'help' command to list all commands with
simple description available in the current scope, or use type the command name followed by
'-h' as a parameter. For most commands this shows in-depth help. You can also use the 'ls'
command to show a simple list of all the commands and scopes available with no help text.
In addition to the commands in each scope, additional commands are available globally. These
are mostly commands to manipulate the command prompt and current scope, such as 'pwd'
and 'cd'. These commands always appear when a scope contents are listed with 'ls' or 'help'.
Commands can also be executed from another scope, see 'Changing Scope', below.
Changing Scope
Changing scope is straightforward, either type the scope name directly or use the 'cd' command
(see the 'cd' command, below). Beginning a scope name with '/' will tell the user interface to
look for that scope from the top level (root) scope. If the '/' is omitted, the scope is resolved
relative to the current position. The '..' and '.' are special scope names; they are used to access
the 'parent' scope and the 'current' scope respectively. When changing scope, always use a
'/' to separate each scope, e.g.:
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