Mined  is a simple screen editor.  At any instant, a window of 24
lines is visible on the screen.  The current position in the file
is shown by the cursor.  Ordinary characters typed in are insert-
ed at the cursor.  Control characters and  keys  on  the  numeric
keypad	(at the right-hand side of the keyboard) are used to move
the cursor and perform other functions.  Commands exist  to  move
forward  and backward a word, and delete words either in front of
the cursor or behind it.  A word in this context is a sequence of
characters  delimited  on  both  ends by white space (space, tab,
line feed, start of file, or end  of  file).   The  commands  for
deleting  characters and words also work on line feeds, making it
possible to join two consecutive lines by deleting the line  feed
between  them.	 The  editor  maintains one save buffer (not dis-
played).  Commands are present to move text from the file to  the
buffer, from the buffer to the file, and to write the buffer onto
a new file.  If the edited text cannot be written out  due  to	a
full disk, it may still be possible to copy the whole text to the
save buffer and then write it to a different file on a	different
disk with CTRL-Q.  It may also be possible to escape from the ed-
itor with CTRL-S and remove some files.   Some	of  the  commands
prompt	for  arguments	(file names, search patterns, etc.).  All
commands that might result in  loss  of  the  file  being  edited
prompt to ask for confirmation.  A key (command or ordinary char-
acter) can be repeated times by typing where is the  escape  key.
Forward  and  backward searching requires a regular expression as
the search pattern.  Regular expressions follow the same rules as
in  the  editor,  These  rules	can be stated as: Any displayable
character matches itself.  . (period) matches any  character  ex-
cept line feed.  ^ (circumflex) matches the start of the line.	$
(dollar sign) matches the end of the line.  c matches the  char-
acter  c  (including  period, circumflex, etc).  [string] matches
any of the characters in the string.  [^string]  matches  any  of
the  characters  except  those	in the string.	[x-y] matches any
characters between x and y (e.g., [a-z]).  Pattern*  matches  any
number	of  occurrences of pattern.  Some examples of regular ex-
pressions are:
  The boy   matches the string The boy
  ^$	    matches any empty line.
  ^.$	    matches any line containing exactly 1 character
  ^A.*.$   matches any line starting with an A,  ending  with	a
	    period.
  ^[A-Z]*$  matches  any line containing only capital letters (or
	    empty).
  [A-Z0-9]  matches any line containing either a  capital  letter
	    or a digit.
  .*X$	    matches any line ending in X
  A.*B	    matches any line containing an A and then a B

Control characters cannot be entered into a file simply by typing
them because all of them are editor commands.  To enter a control
character,  depress  the ALT key, and then while holding it down,
hit the ESC key.  Release both ALT and ESC and type  the  control
character.   Control  characters  are displayed in reverse video.
The commands are as follows.

CURSOR MOTION

  arrows    Move the cursor in the indicated direction
  CTRL-A    Move cursor to start of current line
  CTRL-Z    Move cursor to end of current line
  CTRL-^    Move cursor to top of screen
  CTRL-_    Move cursor to end of screen
  CTRL-F    Move cursor forward to start of next word
  CTRL-B    Move cursor backward to start of previous word

SCREEN MOTION

  Home key  Move to first character of the file
  End key   Move to last character of the file
  PgUp key  Scroll window up 23 lines (closer  to  start  of  the
	    file)
  PgDn	key  Scroll  window  down  23 lines (closer to end of the
	    file)
  CTRL-U    Scroll window up 1 line
  CTRL-D    Scroll window down 1 line

MODIFYING TEXT

  Del key   Delete the character under the cursor
  Backspace Delete the character to left of the cursor
  CTRL-N    Delete the next word
  CTRL-P    Delete the previous word
  CTRL-T    Delete tail of line (all characters  from  cursor  to
	    end of line)
  CTRL-O    Open up the line (insert line feed and back up)
  CTRL-G    Get and insert a file at the cursor position

BUFFER OPERATIONS

  CTRL-@    Set  mark at current position for use with CTRL-C and
	    CTRL-K
  CTRL-C    Copy the text between the mark and	the  cursor  into
	    the buffer
  CTRL-K    Delete  text between mark and cursor; also copy it to
	    the buffer
  CTRL-Y    Yank contents of the buffer out and insert it at  the
	    cursor
  CTRL-Q    Write the contents of the buffer onto a file

MISCELLANEOUS

  numeric + Search forward (prompts for regular expression)
  numeric - Search backward (prompts for regular expression)
  numeric 5 Display the file status
  CTRL-]    Go to specific line
  CTRL-R    Global  replace  pattern  with string (from cursor to
	    end)
  CTRL-L    Line replace pattern with string
  CTRL-W    Write the edited file back to the disk
  CTRL-X    Exit the editor
  CTRL-S    Fork off a shell (use CTRL-D to get back to the  edi-
	    tor)
  CTRL-    Abort whatever the editor was doing and wait for com-
	    mand
  CTRL-E    Erase screen and redraw it
  CTRL-V    Visit (edit) a new file

Mined was designed by Andy Tanenbaum and written by Michiel Huis-
jes.