Scripts Essay
3.0 Variables. Scripts may contain variables. Variable names must begin with a letter or an underscore (’_’), and may contain any sequence of upper- or lower-case letters, digits, and underscores. You cannot use a reserved word as a variable name. For more information, see the list of reserved words at the end of this document. You must declare variables before you use them. When you declare a variable, you must also define its type. A variable of a certain type may only contain values of that same type. The following three types of variables are supported:
Type Description integer A negative or positive number, such as 7, -12, or 5698. string A series of characters enclosed in double-quotes; for example, “Hello world!” or “Enter password:”. Boolean A logical boolean value of TRUE or FALSE. Variables are assigned values using the following assignment statement: variable = expression The variable gets the evaluated expression. Examples:
- integer count = 5
- integer timeout = (4 * 3)
- integer i
- boolean bDone = FALSE
- string szIP = (getip 2)
- set ipaddr szIP
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3.1 System Variables. System variables are set by scripting commands or are determined by the information your enter when you set up a Dial-Up Networking connection. System variables are read-only, which means they cannot be changed within the script. The system variables are: Name Type Description $USERID String The user identification for the current connection. This variable is the value of the user name specified in the Dial-Up Networking Connect To dialog box.
- PASSWORD String The password for the current connection. This variable is the value of the user name specified in the Dial-Up Networking Connect To dialog box.$SUCCESS Boolean This variable is set by certain commands to indicate whether or not the command succeeded. A script can make decisions based upon the value of this variable.
- FAILURE Boolean This variable is set by certain commands to indicate whether or not the command failed. A script can make decisions based upon the value of this variable. These variables may be used wherever an expression of a similar type is used. For example, transmit
- USERID is a valid command because $USERID is a variable of type string.
4.0 String Literals. Scripting for Dial-Up Networking supports escape sequences and caret translations, as described below. String Literal Description. char Caret translation If char is a value between ‘@’ and ‘_’, the character sequence is translated into a single-byte value between 0 and 31. For example, ^M is converted to a carriage return. If char is a value between a and z, the character sequence is translated into a single-byte value between 1 and 26. If char is any other value, the character sequence is not specially treated. Carriage return Linefeed
\” Double-quote
\^ Single caret
\< Single ‘ = Relational Integers
== != Equality Integers, strings, booleans
and Logical AND Booleans
or Logical OR Booleans
Examples:
count = 3 + 5 * 40
transmit “Hello” + ” there”
delay 24 / (7 – 1)