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  1. or download this
    my $var = "xxx\n";
my $var="zzz\n" unless defined($var);
print $var;
  2. or download this
    #my $var = "xxx\n";
my $var="zzz\n" unless defined($var);
print $var;
  3. or download this
    "my" variable $var masks earlier declaration in same scope at unlesste
+st.pl line 2.
Use of uninitialized value in print at unlesstest.pl line 3.
  4. or download this
    Name "main::var" used only once: possible typo at unlesstest.pl line 2
+.
zzz