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I often forget the names of many commands and always have to look up the internet or the manual but it would be good if i could search within emacs among all the commands / functions

For eg: I know there is a commands to export org file to html but do not know how it begins...so would be great if i could just search for 'export' in all available commands and get a list of all functions which have export in their name.

how can i do this?

I am still amateur so pardon for asking very simple question..

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    The easiest thing to do is start C-h f and try to complete function names, e.g. by typing org*html followed by one or more TABs. The more general solution is to use an apropos command. See (emacs) Apropos. Yet another solution is to use a completion framework which supports fuzzy or out-of-order completion, such as ivy, helm or icicles.
    – Basil
    Commented Feb 24, 2018 at 12:54
  • @Basil: Please consider posting your comment as an answer.
    – Drew
    Commented Feb 24, 2018 at 17:33

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Use command apropos-command (C-h a) to see summary info about available commands.

Use command apropos-function to see summary info about available functions (including commands).

These commands let you type a regular expression or some keywords, and they find command/function names that match what you typed.

See the Emacs manual, node Apropos, for more information.

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