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TIBCO GridServer® 7.1.0

# Expressions

PDS supports the usual arithmetic operators (`+`, `-`, `*`, `/`) with standard precedence. All arithmetic operations use double-precision floating-point values.

PDS also supports the standard C-style comparison operators `(==`, `!=`, `>`, `<`, `>=`, `<=)`. These operators perform numeric comparison if both arguments are valid numbers; otherwise, they perform string comparison. They evaluate to zero if the comparison is false and to a non-zero value if it is true.

PDS does not support the relational operators `and`, `or`, and `not`.

## Backquote expressions

A string enclosed in backquotes (`‘such as this‘`) has variable substitution performed on it, and the result is evaluated in a subshell. The standard output of the command is collected, newlines and linefeed characters are replaced by spaces, and trailing whitespace is removed. The result is the value of the expression.

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