Ttyplay plays the tty session in file, which was recorded previously by ttyrec(1).
When -p option is given, ttyplay output the file as it grows. It means that you can see the "live" shell
session running by another user.
If you hit any key during playback, it will go right to the next character typed. This is handy when
examining sessions where a user spends a lot of time at a prompt.
Additionally, there are some special keys defined:
+orf
double the speed of playback.
-ors
halve the speed of playback.
0 set playback speed to 0, pausing playback.
1 set playback to speed 1.0 again.