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Examining and Setting Variables
`C-h v VAR RET'
Print the value and documentation of variable VAR
`M-x set-variable RET VAR RET VALUE RET'
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 prints both the value and the
documentation of the variable. For example,
C-h v fill-column RET
prints something like this:
fill-column's value is 75
*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 an option. `C-h v' is not restricted to options; it allows
any variable name.
The most convenient way to set a specific 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,
M-x set-variable RET fill-column RET 75 RET
sets `fill-column' to 75.
You can set any variable with a Lisp expression using the function
`setq'. Here's how to use it to set `fill-column':
(setq fill-column 75)
Setting variables, like all means of customizing Emacs except where
explicitly stated, affects only the current Emacs session.
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