If $1 = "" I get an error, Help:-)

[Ben A. Hunsberger]

In article <541 at mtndew.Tustin.CA.US> friedl at mtndew.Tustin.CA.US (Steve Friedl) writes:
>> Enclose the $1 in "s:
>> 
>>            if [ "$1" = "" ]
>> 
>
also suggested...
>
>             if [ x"$1" = x"" ]
>

ok, excuse my ignorance but, wouldn't the following work just as well?

   if [ -z "$1" ]

which is used to test if the variable is zero length?
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