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Writing Technician Interface Scripts

1-4

308660-14.00 Rev 00

Local, Global, and System Variables

When you first define a variable, the computer stores it in the local environment

variable table. Local variables are only accessible from within the script in which

they were created. You cannot access them from another script file. When a script

routine ends, any local variables that you defined are automatically deleted.

Global variables are stored in the global environment variable table and may be

accessed by any script file. You create global variables by using the

export

command to change a local variable to a global variable. For more information

about the

export

command, see Chapter 2. Global variables are not automatically

deleted when a script file ends.

System variables, which are read-only, are created only during a Telnet session.

You cannot have the same variable name in the local and the global variable

tables. You can delete local and global variables by using the

unsetenv

command.

You can also change the value of a global variable by using any of the set variable

commands (

arrayenv, cutenv

enumenv

instenv

let, mi/jointfilesconvert/95481/bget

setenv

, or

sprintf

). For more information about these commands, see Chapter 2.

Special Variables

This section describes how to use input variables, how to prompt for user entry

from the console, and how to access and format information from the MIB.

Input Parameters

The Technician Interface reserves the following variables as input parameters for a

script file:

and

. The special variable

contains the number of parameters entered on the command line following the

script file name. It is set to zero if no parameters are entered. For more

information about input parameters, see “

run

” in Chapter 2.

Note:

The value of a variable in the local or global table takes precedence over

a variable with the same name in the system variable table.

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