Now for some personal keybindings:
;;; Compare windows (global-set-key "\C-cw" 'compare-windows)
compare-windows is a nifty command that compares the text in
your current window with text in the next window. It makes the
comparison by starting at point in each window, moving over text in
each window as far as they match. I use this command all the time.
This also shows how to set a key globally, for all modes.
The command is
global-set-key. It is followed by the
keybinding. In a .emacs file, the keybinding is written as
\C-c stands for ‘control-c’, which means ‘press the
control key and the c key at the same time’. The
‘press the w key’. The keybinding is surrounded by double
quotation marks. In documentation, you would write this as
C-c w. (If you were binding a META key, such as
M-c, rather than a CTRL key, you would write
\M-c in your .emacs file. See Rebinding Keys in Your Init File in The GNU Emacs Manual, for
The command invoked by the keys is
compare-windows. Note that
compare-windows is preceded by a single quote; otherwise, Emacs
would first try to evaluate the symbol to determine its value.
These three things, the double quotation marks, the backslash before the ‘C’, and the single quote mark are necessary parts of keybinding that I tend to forget. Fortunately, I have come to remember that I should look at my existing .emacs file, and adapt what is there.
As for the keybinding itself: C-c w. This combines the prefix key, C-c, with a single character, in this case, w. This set of keys, C-c followed by a single character, is strictly reserved for individuals’ own use. (I call these ‘own’ keys, since these are for my own use.) You should always be able to create such a keybinding for your own use without stomping on someone else’s keybinding. If you ever write an extension to Emacs, please avoid taking any of these keys for public use. Create a key like C-c C-w instead. Otherwise, we will run out of ‘own’ keys.
Here is another keybinding, with a comment:
;;; Keybinding for `occur' ; I use occur a lot, so let's bind it to a key: (global-set-key "\C-co" 'occur)
occur command shows all the lines in the current buffer
that contain a match for a regular expression. Matching lines are
shown in a buffer called *Occur*. That buffer serves as a menu
to jump to occurrences.
Here is how to unbind a key, so it does not work:
;;; Unbind `C-x f' (global-unset-key "\C-xf")
There is a reason for this unbinding: I found I inadvertently typed C-x f when I meant to type C-x C-f. Rather than find a file, as I intended, I accidentally set the width for filled text, almost always to a width I did not want. Since I hardly ever reset my default width, I simply unbound the key.
The following rebinds an existing key:
;;; Rebind `C-x C-b' for `buffer-menu' (global-set-key "\C-x\C-b" 'buffer-menu)
By default, C-x C-b runs the
list-buffers command. This command lists
your buffers in another window. Since I
almost always want to do something in that
window, I prefer the
command, which not only lists the buffers,
but moves point into that window.