Specifically I want to do the same thing as (setq frame-title-format ...) would do in my config file, but from the M-x interactive command. M-x setq does not seem to work.
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To set a variable defined with defcustom you can also use M-x set-variable. You will not have to type the parentheses and you will have name completion.
Nicolas Dudebout
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1`set-variable` only allows you to set user options, that is, variables whose documentation strings start with an asterisk character. – Sean Apr 24 '13 at 21:15
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A user option is a variable defined by `defcustom`. I do not understand the asterisk character part of your comment. – Nicolas Dudebout Apr 24 '13 at 21:40
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3The asterisk thing is an old convention, and it's not true anymore. – Dmitry Apr 24 '13 at 22:34
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OK. That makes sense as I tried it and it did not work. Only defcustom does. – Nicolas Dudebout Apr 24 '13 at 23:37
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1Yeah, I tried `M-x set-variable` for `frame-title-format` and it did not work: `[No match]`. – sligocki Apr 25 '13 at 17:48
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This is only for `defcustom` variables as mentioned in the answer. Since `frame-title-format` is not `defcustom`ed it cannot work. – Nicolas Dudebout Apr 25 '13 at 17:55