* Phil Stracchino schrieb am 03.03.10 um 20:18 Uhr:
> On 03/03/10 14:05, Brian Debelius wrote:
> > Hi,
> > 
> >    Looking at Bacula scripts and other scripts, I see a test for an 
> > empty string performed by adding an 'x' before the variable, and then 
> > comparing this to another string that is just an 'x'.
> > 
> >    The shell test function has a -z string test that returns true if the 
> > string is empty.
> > 
> > It appears to me that more people use the 'x' comparison.  Is there a 
> > technical reason why one would be preferable to the other?
> > 
> >     Why would you do this:
> > 
> > if [ "x$var" = "x" ]; then
> > ...
> > fi
> > 
> >    Instead of this:
> > 
> > if [ -z $var ]; then
> 
> more properly:  if [ -z "$var" ]; then


Why not use 

  if [ "$var" = "" ]; then

if -z may not be available?

-Marc
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