help scripting bash

[John H. Robinson, IV]

m ike wrote:
> this
> 
>   convert  -draw "line 10,10,20,20"  text.jpg out.jpg
> 
> draws a line on the image from 10,10 to 20,20 
> 
> so does this:
> 
>   g="line 10,10,20,20"
>   convert -draw "$g"  text.jpg out.jpg
> 
> but this chokes:
> 
>   g='-draw "line 10,10,20,20"'
>   echo $g
>   convert $g text.jpg out.jpg
> 
> appearantly convert is seeing "line 10,10,20,20" as two 
> arguments, divided at the space.
> 
> I'm at a loss. any ideas? 

Use a better shell:

in zsh:

% g=(-draw "line 10,10,20,20"); convert -fill black $g mushroom.jpg X:-

That makes a pretty diagonal line, just as you expect.

-john