UDM Command Format - Strings in Expressions

You can use strings as operators in EQ and NE expressions. However, to avoid ambiguity, strings must be quoted explicitly (even if they are contained in a variable reference); otherwise, an error is generated.

The following expression correctly compares strings:

<"yes" EQ "yes">

Conversely, the following expression results in an error because the strings being compared are not quoted:

<yes EQ yes>

For the next two examples, assume that a variable called myvar has been defined with a value of yes.

This expression results in an error because when myvar is referenced, its value (yes) is not quoted:

<$(myvar) EQ "yes">

Instead, the correct expression should be:

<"$(myvar)" EQ "yes">

Index Position and Sequence

When working with strings, the following policy regarding the inclusion/exclusion of positional length/index and sequences should be followed:

• Positional Index or Length = Include the value at that position in the operations.
• Sequences = Exclude the value in operations.

(See deletestring, insertstring, and substring in Universal Data Mover Commands.)