emacs: Orgmode, how to make a list from a block of lines

Question

Is there a way to covert such block of lines

line1  
line2 
linen

into

1. line1
2. line2
n. linen

Using Emacs org mode

Answer 1

the shortest way I know of is: highlight the lines, including their newline character,

line1
line2
line3

Then execute M-x org-ctrl-c-minus (press C-c -) and you will get

- line1  
- line2 
- line3

Then run M-x org-shiftright (press <S-right>) twice and you get the desired

1. line1  
2. line2 
3. line3

Answer 2

don't know if there is a direct way, haven't heard of it yet at least. But one approach would be to use string-rectangle (C-x r t) to prepand 1. to all lines and then hit C-c C-c to update the numbering.

For string-rectangle you would put point and mark the following way:

v---mark
line1 with some text
line2 with more text
<---point

After M-x: string-rectangle: 1. you will get:

1. line1 with some text
1. line2 with more text

Hitting C-c C-c will give you the correct numbering!

Easier because it gives you visual feedback is to enable CUA-mode and use C-return to create a rectangle selection, then you can start typing on all lines in parallel. See also this video on youtube.