It's parameter substitution.
Use the first one if not null, otherwise use the second.
Try this:
> TEST=${ORACLE_HOME:-NOT SET}
> echo $TEST
Now try misspelling ORACLE_HOME
> TEST=${ORACLE_JOME:-NOT SET}
> echo $TEST
In a script you may have to begin the line with a colon.
e.g. : TEST=${ORACLE_HOME:-NOT SET}
Jared
On Tuesday 25 February 2003 01:28, Sinardy Xing wrote:
> Hi all,
>
> Can someone help me understand this...
>
> ROOT # TEST=${2:-.}
> ROOT # echo $TEST
> ROOT #.
>
> what is 2:-.
>
>
> another similar code
>
> ROOT # TEST=${1:-0}
> ROOT # echo $TEST
> ROOT # 0
>
>
>
> they looks like emoticon for me
>
> Thank you
>
> Sinardy
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