Problem with ash -n non-zero length string test

[Mike Frysinger]

On Saturday 07 July 2007, Dallas Clement wrote:
> I'm experiencing some weird things when trying to use -n to test for a
> non-empty string as in the following example.
>
> boot_drive_name=""
>
> if [ -n $boot_drive_name ]; then

you need to make sure you quote things as this will be fragile regardless of 
the shell

[ -n "$some_var" ]
[ -z "$some_var" ]
-mike
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