Re: [gentoo-user] bash script question

[Kerin Millar]

On 18/08/2014 15:02, Stroller wrote:

On Mon, 18 August 2014, at 1:16 pm, Kerin Millar <kerfra...@fastmail.co.uk> 
wrote:
...
        (( count += matches ))
    done < <(grep -hcm1 -F "$string" ${files[*]})

Oh, this is lovely.

I've learned some things today.

    if (( count == ${#files[@]} )); then

May I ask why you prefer these brackets for evaluation, please?

There was no particular reason, other than to maintain consistency in 
the example (both for evaluation and as an alternative to expansion). 
Sometimes, I find double square brackets to be a bit of an eyesore, but 
do tend to use them more often than not.

I particularly like double parentheses for checking exit codes assigned 
to variables. For example:

(( $? )) && echo "something went wrong"

As opposed to having to perform an explicit comparison:

[[ $? != 0 ]] && echo "something went wrong"

--Kerin