Re: implementing flow control in bash

[Bernd Eggink]

Tony Zanella schrieb:
> Hello all,
> I'm sure this isn't a bug, but just my inability to wrap my head
> around enough of bash flow control:
> I wrote the following shell script to find all gifs in a directory.
> Then use "identify" from imagemagick to grab the gif width. Then,
> print the image name and width to a file.
>
>   for i in `find . -name \*gif`; do identify -format "$i %w" $i; done
> > results.txt
>
> Then, I used a ruby script to cull only those images with a width over
> 570 pixels. So, problem solved, but I wanted to see if I could do it
> all in bash.
> More specifically, (if this makes sense) I want to "do identify
> -format "$i %w" $i" only for those "$i %w" where "%w" is > 570.
>
> The above script will give me output like:
>
>   image1.gif 360
>   image2.gif 780
>
> But I want it to give me:
>
>   image1.gif 360
>
> In pseudo-code, I want something like:
>
>   for i in `find . -name \*gif`; do identify -format "$i %w" $i if [%w
> > 570]; done > results.txt

for i in $(find -name '*.gif')
do
    w=$(identify -format %w $i)
    (( w > 570 )) && echo "$i $w"
done

Hope that helps,
Bernd

--
Bernd Eggink
http://sudrala.de