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6.6 Advanced ED Commands CP/M 3 User's Guide
6.6 Advanced ED Commands
The basic editing commands discussed previously allow you to use ED for all your
editing. The following ED commands, however, enhance ED's usefulness.
6.6.1 Moving the CP and Displaying Text
The P (Page) Command
Although you can display any amount of text at the screen with a T command, it
is sometimes more convenient to page through the buffer, viewing whole screens of
data and moving the CP to the top of each new screen at the same time. To do this,
use ED's P command. The P command takes the following forms:
nP, -nP
where n is the number of pages to be displayed. If you do not specify n, ED types
the 23 lines following the CP and then moves the CP forward 23 lines. This leaves
the CP pointing to the first character on the screen.
To display the current page without moving the CP, enter OP. The special character
0 prevents the movement of the CP. If you specify a negative number for n, P pages
backwards towards the top of the file.
The n: (Line Number) Command
When line numbers are being displayed, ED accepts a line number as a command
to specify a destination for the CP. The line number command takes the following
form:
n:
where n is the number of the destination line. This command places the CP at the
beginning of the specified line. For example, the command 4: moves the CP to the
beginning of the fourth line.
Remember that ED dynamically renumbers text lines in the buffer each time a line
is added or deleted. Therefore, the number of the destination line you have in mind
can change during editing.
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