PRBool exists ( AString name )

Check the existence of an environment variable. This method checks whether an environment variable is present in the environment or not.

- For Unix/Linux platforms we follow the Unix definition: An environment variable exists when getenv() returns a non-NULL value. An environment variable does not exist when getenv() returns NULL. - For non-Unix/Linux platforms we have to fall back to a "portable" definition (which is incorrect for Unix/Linux!!!!) which simply checks whether the string returned by Get() is empty or not.

Arguments:

name: the variable name to probe.

Returns:

if the variable has been set, the value returned is PR_TRUE. If the variable was not defined in the environment PR_FALSE will be returned.

AString get ( AString name )

Get the value of an environment variable.

Arguments:

name: the variable name to retrieve.

Returns:

returns the value of the env variable. An empty string will be returned when the env variable does not exist or when the value itself is an empty string - please use |exists()| to probe whether the env variable exists or not.

void set ( AString name , AString value )

Set the value of an environment variable.

Arguments:

name: the variable name to set.

value: the value to set.