becomes the tab column width - this is a useful feature for program files which are heavily indented with tabs. If the editor is supplied on disk, you must have the correct disk in your drive, and the editor must be in the current directory, or in a directory that is in your search path. When the editor is started it determines the size of the file and allocates for itself sufficient memory space for the file, plus 32k (kilobyte, enough for about an extra 30,000 characters of text). The size of the edit buffer is displayed as the file to be edited is read in.
Because of this memory allocation scheme you cannot increase the size of the file by more than 32,000 characters during a single edit session; if you get the ‘file too large’ message on the status line then you will have to write the file out (using the command) and re-edit it. This isn’t usually much of a problem. Ctrl K X General operation The editor works on the basis of always displaying all of the current line; partial lines are displayed but if the cursor is moved to a line which is not fully on the screen then the display is scrolled to bring the line into view. A ‘marker’ is a position within your text file which you supply to the editor and which is remembered by the editor.
The markers are used for remembering positions in the file. If text is added or deleted before, between or after markers they stay at the same position in the text, so that if you place a marker at the start of a particular word then it will stay at the start of the word if text is inserted or deleted before it. The positions of markers are lost if you quit from the editor (using the or commands). Ctrl K Q Ctrl K X Whenever the editor reads or writes a disk file the user is first prompted to enter the filename. The editor makes a guess at the name of the file and if it is correct you need only press the key; otherwise you may edit the filename in the usual manner before pressing .
Whenever edit prompts for an output filename, placing a > character at the front of the filename results in the text to be written being appended to that file, rather thanoverwriting itas is normal. This feature is onlyavailable from 1616/OS Version 4 and up. Enter Enter Once within the editor a status line appears at the top of the screen. From left to right, the status line consists of: A general message display area for status information and command echoing.
The cursor position within the file, measured in characters from the start of the file The current line number The current character number within the current line The name of the file which is being edited Page 46 User Tutorial Manual Edit: The Screen Editor