The pep virtual machine maintains an automatic count of the number of
lines which have been read from the input stream. This line-count is kept
in the lines register of the virtual machine. You can access this
register with the lines
command and the nolines
command.
The lines command adds the current count in the lines register to the end of the workspace buffer (as text). The nolines command resets the lines counter to zero (the lines counter is automatically initialised at zero at the start of the nom script).
The pep interpreter actually accepts “ll” as an alias for the
lines
command, but “lines” seems a lot more readable.