21.1.3 Specifications for advanced scripts

<Structure of this section>

(1) Script Classification

Scripts are divided into the following three types according to the startup method.

Table 21-3: Script types according to the startup method
Script type	Description
Command script	Execute the operation command python to start thescript.
Resident script	Start the script as a resident program. Starts the file installed by the operation command install script by specifying it in the configuration command resident-script.
Event startup script	Starts the script when a monitoring event is detected. After installing a file using the operation command install script, use the applet function configuration command to specify the association between the monitoring event and the file to be started.

(2) Standard input and output of scripts

The following table shows the support for standard input/output for scripts.

Table 21-4: Support for standard script input/output
Script type	Standard input	Standard output	Standard error output
Command script	OK	OK	OK
Resident script	NG	NG	OK^#
Event startup script	NG	NG	OK^#

(Legend) OK: Supported NG: Not supported

#: This can be checked using the operation-command dump script-user-program.

(3) Script-only user

Resident scripts and event startup scripts operate with the privileges of the script-only user. The following table describes the script-only users.

Table 21-5: Script-only users
Item	User information
User name	script
Home directory	/opt/script

(4) Access authority

You can access the directories and files on the Switch using scripts that are executed by the Switch. The following table lists the range of directories and files that can be accessed by scripts.

Table 21-6: Range of directories and files that can be accessed
Access type	Description
Command script	Follow the user privileges that invoked the command script.
Resident script	Follow the privileges of the script-only user.
Event startup script	Follow the privileges of the script-only user.

(5) Number of scripts that can be executed simultaneously

The Switch can execute multiple scripts at the same time by starting multiple scripts. The following table shows the number of scripts that can be executed simultaneously.

Table 21-7: Number of scripts that can be executed concurrently
Script type	Maximum number of concurrent executions
Command script	4
Resident script	4
Event startup script	4