z/VM: CP Commands and Utilities Reference - z/VM - IBM

Responses
4. If you try to define a minimum abbreviation that matches the abbreviation for an
existing command, subcommand, or alias CP rejects your DEFINE command.
For example, if you created a “QUEUE” alias with a minimum abbreviation of 2,
CP would reject your QUEUE alias because “QU” is an abbreviation for the
QUERY command. In this case, you would need to specify a minimum
abbreviation greater than or equal to 4 because the first 3 characters of QUERY
and QUEUE are identical.
5. If you do not specify the ENABLE operand, the new alias is initially in a disabled
state. To activate an alias after defining it, use the ENABLE COMMAND or CMD
command (page 426).
Note that both the alias you define and its base command must be enabled for
the alias to work. For example, if you define alias SHOWIT for the existing
command DISPLAY, DISPLAY is considered the base command. DISPLAY must
also be enabled for the alias SHOWIT to work.
6. To deactivate an alias after defining it, use the DISABLE COMMAND or CMD
command (page 263).
If you specify the name of an alias on DISABLE COMMAND, then just the alias
is disabled. If you specify the name of the base command on DISABLE
COMMAND then you disable the entire function. That means that the base
command is in a disabled state and every alias you have defined for that
command is treated as if it were also disabled.
7. To obtain information such as the enable/disable status and the name of the
base command for the alias you have defined, use the QUERY CPCMDS
command (page 728).
8. Once defined, an alias name cannot be used again. An alias cannot be modified
or eliminated; it can only be disabled. Only a SHUTDOWN or RESTART IPL will
eliminate an alias.
9. For more information about creating an alias, see the z/VM: CP Exit
Customization book.
Response 1:
To define GOODNIGHT as an alias for the CP SHUTDOWN command and make it
available immediately, enter the following:
def alias goodnight for shutdown abbrevlength 5 enable
Ready;
Response 2:
To define TELL as an alias for the IBM class version of the CP MESSAGE
command and make it available immediately, enter the following:
define alias tell for message ibmclass 0 enable
Ready;
Response 3:
To define NUKE as an alias for all of the IBM class versions of the CP PURGE
command and make it available immediately, enter the following:
define alias nuke for purge ibmclass * enable
Ready;
DEFINE ALIAS
Chapter 2. CP Commands 121