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

The ED Command CP/M 3 User's Guide
Section 6 gives a detailed description of the overall operation of the ED
utility and the use of each command.
If you do not include a command tail in the ED command, it prompts
you for the input filespec and the output filespec as follows:
Enter Input File :
After you enter the input filespec, ED prompts again:
Enter Output Fi le :
Enter a filename or drive if you want the output file or its location to
be different from that of the input file. Press RETURN if you want the
output file to replace the input file. In this case, the input file is renamed
to type BAK.
If the second file specification contains only the drive specifier, the
second filename and filetype become the same as the first filename and
filetype.
If the file given by the first file specification is not present, ED creates
the file and writes the message:
NEW FILE
If the file given by the first filespec is already present, you must issue
the A command to read portions of the file to the buffer. If the size of
the file does not exceed the size of the buffer, the command
# a
reads the entire file to the buffer.
The 1 (Insert) command places ED in insert mode. In this mode, any
characters you type are stored in sequence in the buffer starting at the
current CP.
5-35