The editor vi has two modes of operation: command mode and
insert mode. In command mode you can move the cursor
around the text, and make changes to existing text. To enter new
text you must use insert mode. You can get into insert mode
with the I or i (insert),A or a (append) and O or o (open line)
commands. To exit from insert mode hit the ESC (escape) key;
on some terminals the ESC key is the ctrl-[ (control key with the
left square bracket).
To edit a file type vi followed by the filename. If you are
creating a new file use the same format. To exit from vi
type :wq or ZZ, e.g.
login% vi params
The screen will then clear and at the bottom of the screen
there will be a status line, e.g.
params [new file]
There are two useful features of vi you should know about. First,
if you execute a command you wish you hadn't, vi provides a
command to undo the last change you made; just type u. The undo
command only lets you reverse a single change. To restore a
complete line type U; this will only work if you do not move
off the line.
Second, if you are editing a file with vi and the system crashes,
don't panic. The system will save the journal file. When the system comes back up you will be sent a mail
message to tell you what file you were editing. You can recover
your file by using vi -r <filename>.
Please note that in your .login and .cshrc files, which set
up your environment, the first time you log on, there will
already be some commands for setting up your terminal as a vt102.
Since terminal setup can be extremely complicated in UNIX, don't remove what is
already there unless you wish to set it up again yourself in some
other way. Many screen-oriented programs, like vi, will not work
properly if your terminal has not been set up. If you are using
a VT220 or VT220 emulator, you should go to the General screen
in Set-up and set your terminal to VT100 mode (VT220 ID is
harmless with it).
To get a basic idea of how to run the editor type man vi . If you wish to see the many
commands for vi , refer to Editing Text Files.
emacs is the supported editor of choice at NRAO. Unlike vi, emacs is not a modal
editor. Special functions, as in EDT, are implemented with control keys, and any
key not defined to execute a function will be inserted in the text.
By default these control keys are not mapped to your keypad, but you
can set this up if you wish. If you are really keen on EDT, you can
even set up your keypad so that emacs looks almost exactly
like it.
There are a few special functions of emacs you should know
about. First, for those new to it, emacs has a tutorial mode
which can greatly help you to learn your way around. The first time you
invoke emacs, it will tell you how to run this (note: since this
isn't mentioned until well into the tutorial -- you get out of
emacs using ^X^C). Second, it has a much nicer
undo function than vi. Third, it saves the previous version
of the file by appending a ~ to the original filename,
so if you do something silly you can still get this previous version back.
And finally, it has a semi-automatic recovery for aborted editing
sessions. If a related journal file exists which is newer than the
file you invoke emacs on, it will inform you, and allow you to
recover all the changes that were made during the aborted session.
Manuals are available on using emacs, although for many people
the tutorial is enough to get them well on their way.
The command spell collects the words from a document and
compares them to a spelling list. Words that do not match ones
in the spelling file are printed on the standard output (the
screen). The format for spell is:
login% spell <filename>
You may wish to have your misspelled words put in a file
where you can look at them at any time. To do so, just redirect
the output to a file by using the > sign, e.g.
login% spell letters > letters.err
This example will check the spelling in the file letters and
put the misspelled words in the file letters.err. For more details, see the man page on spell
The command ispell is a very useful spell-checking program which can be invoked from the % prompt or run
directly from within emacs by typing ^CS. It runs interactively, prompting you for actions on words it does not recognize, and also has an interface from
emacs so you can spell-check your file without exiting from emacs. It recognizes TeX formats, and
uses a more comprehensive dictionary than spell. For more details, see the man page on ispell.
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