if, -n <string>

[coubeatczech]

coub@notas:~$ echo $variable

coub@notas:~$ variable=hello
coub@notas:~$ if [ -n $variable ]; then echo true; fi
true
coub@notas:~$ if [ -z $variable ]; then echo true; fi
coub@notas:~$ variable=
coub@notas:~$ if [ -n $variable ]; then echo true; fi
true
coub@notas:~$ if [ -z $variable ]; then echo true; fi
true
coub@notas:~$

Can anybody explain to me this behaviour? I would expect not any output in
the last command...? The variable is set to zero and there is the condition
is still true...?

thanks, Jakub
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