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  1. or download this
    C:\test>perl -Mstrict -E"$x = 1; $x = 10"
Global symbol "$x" requires explicit package name at -e line 1.
...
Execution of -e aborted due to compilation errors.

C:\test>perl -Mstrict -E"my $x = 1; my $x = 10"
  2. or download this
    C:\test>perl -Mstrict -wE"my $x = 1; my $x = 10"
"my" variable $x masks earlier declaration in same scope at -e line 1.