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any getenv( string )

Returns the value of an environment variable given its name as the argument.


string getenv ( string, number )

Returns the value of an environment variable given its name as the argument. If a second argument (number) is given and the number is zero, the function returns a string, even if the environment variable content looks like a date or a number.


none nice ( number )

Lower the priority of the macro by calling the nice() system call.


string putenv ( string,string )

Sets the value of an environment variable, given its name as the first argument and its value as the second argument.


number shell ( ... )

Returns the exit status of the command invoked.


none sleep ( number )

Stops the macro for a given number of seconds