IO Variable¶
Material prepared from M Programming Book [WALTERS1997] (Pages 157,161) [WALTERS1997] and GT.M Programmer’s Guide
Input/Output Variable:
$I[O]
The I/O Variable is an intrinsic special variable, as seen by the ‘$’ prefix. The I/O Variable is a variable which designates the current I/O stream. This variable can be changed using the NEW Command and SET Command commands.
You can see the value of the I/O variable with the following code:
WRITE $IO
or the short form
W $I