jove (1) - Linux Manuals
jove: an interactive display-oriented text editor
NAME
jove - an interactive display-oriented text editorSYNOPSIS
jove [ -djove -r
DESCRIPTION
JOVE is Jonathan's Own Version of Emacs. It is based on the original EMACS editor written at MIT by Richard Stallman. Although JOVE is meant to be compatible with EMACS, there are some major differences between the two editors and you shouldn't rely on their behaving identically.JOVE works on any reasonable display terminal that is described in the termcap file (see TERMCAP(5) for more details). When you start up JOVE, it checks to see whether you have your TERM environment variable set. On most systems that will automatically be set up for you, but if it's not JOVE will ask you what kind of terminal you are using. To avoid having to type this every time you run JOVE you can set your TERM environment variable yourself. How you do this depends on which shell you are running. If you are running the C Shell, as most of you are, you type
and with the Bourne Shell, you type
where
type
is the name of the kind of terminal you are using (e.g., vt100). If
neither of these works get somebody to help you.
The names of all of the files specified on the command line are saved in a
buffer, called
*minibuf*.
The mini-buffer is a special JOVE buffer that is used when JOVE is prompting
for some input to many commands (for example, when JOVE is prompting for a
file name). When you are being prompted for a file name, you can type ^N
(that's Control-N) and ^P to cycle through the list of files that were
specified on the command line. The file name will be inserted where you are
typing and then you can edit it as if you typed it in yourself.
JOVE recognizes the following switches:
Recover looks for JOVE buffers that are left around and are
owned by you. (You cannot recover other peoples' buffers, obviously.)
If there were no buffers that were modified at the time of the
crash or there were but recover can't get its hands on them, you will be
informed with the message, ``There is nothing to recover.'' Otherwise,
recover prints the date and time of the version of the buffers it has,
and then waits for you type a command.
To get a list of the buffers recover knows about, use the
list
command. This will list all the buffers and the files and the number of
lines associated with them. Next to each buffer is a number. When you want
to recover a buffer, use the
get
command. The syntax is
get buffer filename
where
buffer
is either the buffer's name or the number at the beginning of the line. If
you don't type the buffer name or the filename, recover will prompt you
for them.
If there are a lot of buffers and you want to recover all of them, use the
recover
command. This will recover each buffer to the name of the buffer with ``.#''
prepended to the name (so that the original isn't over-written). It asks
for each file and if you want to restore that buffer to that name you type
``yes''. If you want to recover the file but to a different name, just type
the new name in. If you type ``no'' recover will skip that file and go on
to the next one.
If you want to look at a buffer before deciding to recover it, use the
print
command. The syntax for this is
print buffer
where
buffer
again is either its name or the number. You can type ^C if you want to
abort printing the file to the terminal, and recover will respond with
an appropriate message.
When you're done and have all the buffers you want, type the
quit
command to leave. You will then be asked whether it's okay to delete the
tmp files. Most of the time that's okay and you should type ``yes''. When
you say that, JOVE removes all traces of those buffers and you won't be able
to look at them again. (If you recovered some buffers they will still be
around, so don't worry.) So, if you're not sure whether you've gotten all
the buffers, you should answer ``no'' so that you'll be able to run
recover again at a later time (presumably after you've figured out
which ones you want to save). If there were more than one crashed
JOVE session,
quit
will move you on to dealing with the next one instead of exiting.
If you type ^C at any time other than when you're printing a file to the
terminal, recover will exit without a word. If you do this but wish you
hadn't, just type ``jove -r'' to the shell again, and you will be put back
with no loss.
Once you know the name of a command, you can find out what it does with the
describe-command
command, which you can invoke quickly by typing ``ESC ?''. The
apropos
command will give you a list of all the command with a specific string in
their names. For example, if you want to know the names of all the
commands that are concerned with windows, you can run ``apropos'' with the
keyword
window.
If the initialization file has provided specific keybindings for your
terminal, it should also be possible to view the keyboard layout with
the keychart macro.
If you're not familiar with the EMACS command set, it would be worth your
while to use run TEACHJOVE. Do do that, just type ``teachjove'' to your shell
and you will be placed in JOVE in a file which contains directions. I highly
recommend this for beginners; you may save yourself a lot of time and
headaches.
You can also change the way JOVE behaves in little ways by changing the
value of some variables with the
set
command. The syntax is ``set <variable> value'', where value is a number or a
string, or ``on'' or ``off'', depending on the context. For example, if you
want JOVE to make backup files, you set the ``make-backup-files'' variable to
``on''. To see the value of a variable, use the ``print <variable>'' command.
JOVE then automatically reads further commands from the initialization file
called ``.joverc'' (``jove.rc'' under MSDOS) in your HOME directory.
In this file you can place commands that you would normally type in JOVE.
If you like to rearrange the key bindings and
set some variables every time you get into JOVE, you should put them in your
initialization file. Here are a few lines from mine:
If the variable
"LC_CTYPE"
(see
environ(5))
is not set in the environment, the operational behavior of JOVE for the
"LC_CTYPE"
locale category is determined by the value of the
LANG
environment variable. If
LC_ALL
is set, its contents are used to override both the
LANG
and the
"LC_CTYPE"
variable. If none of the above variables is set in the environment, the "C"
(U.S. style) locale determines how JOVE behaves.
If your terminal has a metakey and you turn on the ``meta-key'' variable,
JOVE will use it to generate commands which would otherwise start with an
ESC. JOVE will automatically turn on ``meta-key'' if the METAKEY
environment variable exists. This is useful for if you have different
terminals (e.g., one at home and one at work) and one has a metakey and the
other doesn't. However, if a locale which recognises 8-bit characters is in
force, a metakey may be better used to generate the extra characters (so leave
the ``meta-key'' variable off).
Searches can't cross line boundaries.
INVOKING JOVE
If you run JOVE with no arguments you will be placed in an empty buffer,
called
Main.
Otherwise, any arguments you supply are considered file names and each is
``given'' its own buffer. Only the first file is actually read in --- reading
other files is deferred until you actually try to use the buffers they are
attached to. This is for efficiency's sake: most of the time, when you run
JOVE on a big list of files, you end up editing only a few of them.
alias cd 'cd \!*; setenv CWD $cwd'
alias popd 'popd \!*; setenv CWD $cwd'
alias pushd 'pushd \!*; setenv CWD $cwd'
RECOVERING BUFFERS AFTER A CRASH
The
-r
option of jove runs the JOVE recover program. Use this when the system
crashes, or JOVE crashes, or you accidently get logged out while in JOVE.
If there are any buffers to be recovered, this will find them.
GETTING HELP
Once in JOVE, there are several commands available to get help. To execute
any JOVE command, you type ``<ESC> X command-name'' followed by <Return>. To
get a list of all the JOVE commands you type ``<ESC> X'' followed by ``?''. The
describe-bindings
command can be used to get a list containing each key, and its associated
command (that is, the command that gets executed when you type that key).
If you want to save the list of bindings, you can set the jove variable
send-typeout-to-buffer
to ON (using the
set
command), and then execute the
describe-bindings
command. This will create a buffer and put in it the bindings list it
normally would have printed on the screen. Then you can save that buffer to
a file and print it to use as a quick reference card. (See VARIABLES below.)
KEY BINDINGS and VARIABLES
You can alter the key bindings in JOVE to fit your personal tastes. That
is, you can change what a key does every time you strike it. For example,
by default the ^N key is bound to the command
next-line
and so when you type it you move down a line. If you want to change a
binding or add a new one, you use the
bind-to-key
command. The syntax is ``bind-to-key <command> key''.
INITIALIZATION
JOVE first reads the system-wide initialization file (/usr/share/jove/jove.rc) which provides reasonable defaults for your installation and loads standard macros.
It will normally observe your TERM environment variable in order to provide terminal-specific key bindings and a map of your keyboard (see the standard ``keychart'' macro).
set match-regular-expressions on
1 auto-execute-command auto-fill /tmp/Re\|.*drft
bind-to-key i-search-forward ^\
bind-to-key i-search-reverse ^R
bind-to-key find-tag-at-point ^[^T
bind-to-key scroll-down ^C
bind-to-key grow-window ^Xg
bind-to-key shrink-window ^Xs
(Note that the Control Characters can be either two character sequences
(e.g. ^ and C together as ^C) or the actual control character. If you want
to use an ^ by itself you must BackSlash it (e.g., bind-to-key grow-window
^X\^ binds grow-window to ``^X^'').
ENVIRONMENT
SOME MINOR DETAILS
You should type ^\ instead of ^S in many instances. For example, the way
to search for a string is documented as being ``^S'' but in reality you
should type ``^\''. This is because ^S is the XOFF character (what gets
sent when you type the NO SCROLL key), and clearly that won't work. The XON
character is ``^Q'' (what gets sent when you type NO SCROLL again) which is
documented as the way to do a quoted-insert. The alternate key for this is
``^^'' (typed as ``^`'' on vt100's and its look-alikes). If you want to
enable ^S and ^Q and you know what you are doing, you can put the line:
set allow-^S-and-^Q on
in your initialization file.
FILES
/usr/share/jove/jove.rc --- system-wide initialization file
/usr/share/jove/jove.rc.$TERM --- terminal-specific initialization file
/usr/share/jove/keychart.$TERM --- terminal-specific help file
/usr/share/jove/macros --- standard macros file
~/.joverc --- personal initialization file
/tmp --- where temporary files are stored
/usr/share/jove/teach-jove --- the interactive tutorial
/usr/lib64/jove/recover --- the recovery program
/usr/lib64/jove/portsrv --- for running shells in windows (pdp11 only)
ENVIRONMENT VARIABLES
TERM --- your terminal type
METAKEY --- if defined, sets the ``meta-key'' variable
SHELL --- the shell to be used by the ``shell'' and other commands
COMSPEC --- (on MSDOS) used if SHELL is not defined
MAIL --- to initialize the ``mailbox'' variable
JOVELIB --- overrides /usr/lib64/jove unless overridden by -l
JOVESHARE --- overrides /usr/share/jove unless overridden by -s
TMPDIR --- overrides /tmp as directory for temporary files
LC_ALL, LC_CTYPE, LANG --- to set the locale
DIAGNOSTICS
JOVE diagnostics are meant to be self-explanatory, but you are advised
to seek help whenever you are confused. You can easily lose a lot of
work if you don't know EXACTLY what you are doing.
BUGS
Lines can't be more than 1024 characters long.
AUTHOR
Jonathan Payne
SEE ALSO
ctags(1) --- to generate tags for the find-tag command and the -t command-line
option
ed(1) --- for a description of regular expressions
teachjove(1) --- for an interactive JOVE tutorial.