- Method getenv
string getenv(string varname, void|int force_update)
mapping(string:string) getenv(void|int force_update)
Queries the environment variables. The first variant returns the value of a specific variable or zero if it doesn't exist in the environment. The second variant returns the whole environment as a mapping. Destructive operations on the mapping will not affect the internal environment representation.
A cached copy of the real environment is kept to make this function quicker. If the optional flag force_update is nonzero then the real environment is queried and the cache is updated from it. That can be necessary if the environment changes through other means than putenv, typically from a C-level library.
Variable names and values cannot be wide strings nor contain
'\0'characters. Variable names also cannot contain
On NT the environment variable name is case insensitive.
- See also