Expands environment variables in a string
|Parameters||(string) A string containing environment variables in the form |
|Return values||(string) The string with the environment variables replaced, where possible.|
This Linux example shows how a variable that does not exist is returned unchanged, returning the "
Replacements will only occur for environment variables. If an environment variable does not exist,
If an empty string is supplied as the parameter, an empty string will be returned. If a NULL is supplied as the parameter, a NULL will be returned.
On non-Windows, daemons (including the Tachyon Agent) have a limited set of environment variables compared with user accounts.