0:23 >perl -e "print $x;"

 0:24 >perl -we "print $x;"
Name "main::x" used only once: possible typo at -e line 1.
Use of uninitialized value $x in print at -e line 1.

 0:24 >perl -M5.014 -e "print $x;"
Global symbol "$x" requires explicit package name (did you forget to declare "my $x"?) at -e line 1.
Execution of -e aborted due to compilation errors.

 0:24 >perl -M5.014 -e "my $x; print $x;"

 0:24 >perl -M5.014 -we "my $x; print $x;"
Use of uninitialized value $x in print at -e line 1.

 0:24 >