Raven Manual - Standard IO

You may have picked up on print ( item -- ) already, to print data to screen, or wherever standard output happens to go. To read from standard input, be it keyboard or whatever, use expect ( -- string ) to read one line.

# read one line 
expect as $line 
 
# read many lines and echo them to screen 
repeat expect trim as $line 
	$line empty until 
	$line print 

To make life easy for scripts that regularly read everything from STDIN and prevent excess repeat-expect loops, input ( -- string ) will read until EOF or an error is encountered.

input as $text 

The Standard IO file handles are also exposed as file resources. Thus the functionality of expect is the same as:

STDIN line 

input can be emulated using:

STDIN read 

print becomes:

STDOUT write 

And standard error is available:

"aaarrgh!\n" STDERR write 

There is no real difference between using the words or the resources to handle Standard IO. It is entirely a matter of choice.