shorten lines

[Matt Graham]

On 2015-03-16 14:41, Michael Havens wrote:
> I wrote something and was wondering if I could shorten it. I wrote:
> sudo adduser pi audio 
> sudo adduser pi video 
[more]
> 
> And was thinking I could shorten it to:
> sudo adduser pi{ audio video input dialout plugdev tty}

I don't think brace expansion will do what you want here, though I 
Could Be Wrong.  Try this:

for i in audio video input dialout plugdev tty ; do
   sudo adduser pi $i
   done

...the "for i in A B C ; do ... done" loop in bash is really useful and 
really easy.  Works with any list of space-separated items, so if you 
want to do something 10 times, "for i in `seq 1 10` ; do ... done" and 
Bob's your uncle.

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