Re: [gentoo-user] Weird bash behavior

[Willie Wong]

On Sun, Mar 05, 2006 at 09:50:36PM +0100, Penguin Lover Alexander Skwar squawked:
> Franta wrote:
>
> > oracle@frankies ~/MyDB $ for AA in [0-9][0-9] ; do echo $AA; done
> > [0-9][0-9]
> > oracle@frankies ~/MyDB $
> >
> > Is this fixed somehow?
>
> [0-9][0-9] will do file name globbing, it seems. Do:
>
> touch 00 99
>

It works for globbing as wild cards, but won't work for what he wants
(I think.)

If you want to expand everything from 00 to 99, you want brace
expansion:

[05:41 PM]wwong ~ $ echo {0..9}{0..9}
00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
[05:42 PM]wwong ~ $ echo {0..99}     
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

It also works for letters

[05:45 PM]wwong ~ $ echo {A..z}
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [  ] ^ _ a b c d e f g h i j k l m n o p q r s t u v w x y z

So, what you wanted would be
 for AA in {0..9}{0..9}; do echo $AA; done

What you had (for AA in [0-9][0-9]) would be interpreted by bash as:
  for AA in {filename that matches the glob [0-9][0-9]}
which, if you don't have any files named like that, will be
  for AA in {null string}
and hence the behaviour you saw. 

W
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Nobody is perfect
Therefore, I am perfect.
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