DIGITAL RESEARCH(r) CP/M Plus TM (CP/M Version 3) Operating ...

6.3 ED Operation CP/M 3 User's Guide
The W (Write) Command
The W command writes lines from the buffer to the new file. The W command
takes the form:
nW
where n is the number of lines to be written from the beginning of the buffer to the
end of the new file. If n is greater than 0, ED writes n lines from the beginning of
the buffer to the end of the new file. If n is 0, ED writes lines until the buffer is half
empty. The OW command is a convenient way of making room in the memory buffer
for more lines from the source file. If the buffer is full, you can use the OW command
to write half the contents of the memory buffer to the new file. You can use the #W
command to write the entire contents of the buffer to the new file. Then you can use
the OA command to read in more lines from the source file.
Note: after a W command is executed, you must enter the H command to reedit
the saved lines during the current editing session.
The E (Exit) Command
An E command performs a normal exit from ED. The E command takes the form:
E
followed by a carriage return.
When you enter an E command, ED first writes all data lines from the buffer and
the original source file to the $$$ file. If a BAK file exists, ED deletes it, then renames
the original file with the BAK filetype. Finally, ED renames the $$$ file from filename.$$$
to the original filetype and returns control to the operating system.
The operation of the E command makes it unwise to edit a back-up file. When vou
edit a BAK file and exit with an E command, ED erases your original file because it
has a BAK filetype. To avoid this, always rename a back-up file to some other filetype
before editing it with ED.
Note: any command that terminates an ED session must be the only command on
the line.
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