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Special Character $

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  • Last UpdatedOct 29, 2024
  • 2 minute read

The $ character has a special meaning in PML. It is an escape character, which means that together with the character which follows it are treated as a special instruction to PML.

The pair of characters beginning with $ is known as an escape sequence. $P is a commonly encountered example, which is used to output a message to the screen:

$P This text will be output to the screen

A number of other escape sequences will be described later in this manual. The important point to note here that if you need the dollar character itself as part of a command, you will need to double it:

$

As the last character on a line, $ means that the next line is a continuation line.

For example:

$P This is an example of a much longer message that will be $

output to the screen

$!

The PML variable following the ! (or !!) is expanded as a STRING by using its own .STRING() method.

Note:
Real values are automatically expanded with any unit qualifier appended if the value is a physical quantity. This is useful on $P lines or converting real values to strings in commands.

Note:
In PML 2 code, it is rarely necessary to use $! to convert a variable to a STRING value. There are STRING methods that can be used to convert a value to a STRING. Debugging PML 2 code is easier if $! is avoided.

$newline

The command continues on next line without being automatically closed.

$M/filename

This executes a text file as a sequence of commands or an input macro. Named using its filename or pathname.

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