The specification for "more" is as specified in the SUS but with the following differences as listed below.
This option specifies an integer which is the screen size (in lines).
more will prompt the user with the message "[Press space to contin ue, 'q' to quit.]" and will display "[Press 'h' for instructions.]" instead of ringing the bell when an illegal key is pressed.
This option is not supported
more usually treats ^L (form feed) as a special character, and will pause after any line that contains a form feed. The -l option will prevent this behavior.
This option is not supported
Causes more to count logical, rather than screen lines (i.e., long lines are not folded).
This option is not supported.
Do not scroll. Instead, clear the whole screen and then display the text.
The option specifies a string that will be searched for before each file is displayed.
Start at line number num.