Editing an existing file
To begin editing an existing file, enter:
ed filename
Your
current working line is the last line in the file. If you want to
change your position in the file before you begin editing, see Identifying line numbers and changing your position in the buffer.If you are already using ed, have finished editing one
file and saved it with the w subcommand, and you now want
to edit another file, enter:
e filename
This erases
the previous contents of the buffer and loads in the new file.