Variables Easy Customization
|C-h v var
Display the value and documentation of variable var
||Change the value of variable var to value.|
To examine the value of a single variable, use C-h v
describe-variable), which reads a variable name using the
minibuffer, with completion. It displays both the value and the
documentation of the variable. For example,
C-h v fill-column
displays something like this:
fill-column's value is 75 Documentation: *Column beyond which automatic line-wrapping should happen. Automatically becomes buffer-local when set in any fashion.
The star at the beginning of the documentation indicates that this variable is a user option. C-h v is not restricted to user options; it allows any variable name.
The most convenient way to set a specific user option is with M-x set-variable. This reads the variable name with the minibuffer (with completion), and then reads a Lisp expression for the new value using the minibuffer a second time. For example,
fill-column to 75.
M-x set-variable is limited to user option variables, but you can
set any variable with a Lisp expression, using the function
Here is a
setq expression to set
(setq fill-column 75)
To execute an expression like this one, go to the `
buffer, type in the expression, and then type C-j. See Lisp Interaction.
Setting variables, like all means of customizing Emacs except where otherwise stated, affects only the current Emacs session.Variables Easy Customization