Re: [Help-bash] Specifying multiple index numbers in array

[Chris F.A. Johnson]

On Fri, 3 May 2013, Jerry wrote:

> I thought I saw a way to do this; however, I cannot find that article.
>
> Assume I have and array with 7 items.
>
> declare -a FOO=(zero one two three four five six)
>
> now, if I wanted to extract index 2 and index 4, how could I do it?
> I could use ${FOO[2]} and ${FOO[4]}; however, I wanted to do it in a
> simpler fashion, something like ${FOO[2][4]} or something similar. Is
> it possible?

  Use brace expansion:

echo "${FOO["{2,4}"]}"

  Note that the brace expression is not quoted.

--
   Chris F.A. Johnson, <http://cfajohnson.com/>
   Author:
   Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
   Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)