[TriLUG] String Evaluation

[Craig Taylor]

They function the same - however using ${myvar} allows you to do stuff
comparisons against strings such as "${myVar}suffix" - whereas
"$myVarsuffix" would obviously fail.


On Tue, Jul 29, 2008 at 1:16 PM, Shawn Taylor <shtaylor at gpi.com> wrote:

> Can someone please explain the difference between these variable usages?
>
> Specifically is it better/more common/more portable to use ${testString}
> instead of "$testString" in my scripts?
>
> Example below.
>
> Thanks,
>
> Shawn
>
> <script>
>
> #!/bin/bash
>
> declare testString
> testString="This is a test string"
>
> echo $testString
> echo "$testString"
> echo ${testString}
>
> # THIS IS WHERE THE FUN BEGINS
>
> if [ -n $testString ]; then
>        echo "String Not Empty - 1"
> fi
>
>
> if [ -n ${testString} ]; then
>        echo "String Not Empty - 2"
> fi
>
>
> if [ -n "$testString" ]; then
>        echo "String Not Empty - 3"
> fi
>
> </script>
>
>
>
> --
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>