The `pause` command displays any text associated with the command and then
waits a specified amount of time or until the carriage return is pressed.
`pause` is especially useful in conjunction with `load` (Note:load )
files.
Syntax:
pause <time> {"<string>"}
<time> may be any integer constant or expression. Choosing -1 will wait
until a carriage return is hit, zero (0) won't pause at all, and a positive
integer will wait the specified number of seconds. `pause 0` is synonymous
with `print` (Note:print ).
Note: Since `pause` communicates with the operating system rather than the
graphics, it may behave differently with different device drivers (depending
upon how text and graphics are mixed).
Examples:
pause -1 # Wait until a carriage return is hit
pause 3 # Wait three seconds
pause -1 "Hit return to continue"
pause 10 "Isn't this pretty? It's a cubic spline."