HP NonStop NS manual Writing Efficient Startup and Shutdown Command Files, Command File Syntax

Creating Startup and Shutdown Files	Writing Efficient Startup and Shutdown Command
	Files

Writing Efficient Startup and Shutdown Command Files

TACL and by many subsystems support command files. Command files for startup or shutdown contain a series of commands that automatically execute when the file is executed. To automate and reduce the time required to start and stop your applications, devices, and processes:

•Include commands in one or more command files that you invoke from either a TACL prompt or another file.

•Write efficient startup and shutdown command files.

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Use command file syntax that executes quickly.

Avoid manual intervention to ensure that command files execute quickly

Use parallel processing to distribute startup and shutdown processes across multiple processors.

Investigate and use product-specific techniques for fast startup and shutdown.

Command File Syntax

The syntax in command files affects the time it takes for them to execute. To ensure that your command files execute quickly:

•Avoid using wild-card characters in command files

A wild card is a character—typically an asterisk (*) or a question mark (?)—used to match any character or series of characters. When you use wild-card characters in your command files, execution time is increased because the system must look up names in a table. By using explicit names instead of wild-card characters, you shorten execution time and allow for commands to execute in parallel.

This PATHCOM START command uses a wild-card character to start all of the TERM objects defined in the PATHMON configuration file:

= START TERM *

This PATHCOM START command uses explicit names to start all of the TERM objects defined in the PATHMON configuration file:

= START TERM (TERM1, TERM2, TERM3, TERM4, TERM5, TERM6)

Note. When using explicit names, you must revise your command files whenever a configuration change occurs. Therefore, you should balance the time it takes to update configuration files against the savings in startup or shutdown time.

•Use single-line commands instead of multiple-line commands. Multiple-line commands in a command file increase execution time.

HP Integrity NonStop NS-Series Operations Guide—529869-005

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