The code you have posted doesn't reproduce the warnings you've shown. diagnostics, splain

"my" variable $host masks earlier declaration in same scope at ./ftp-t
+est.pl
        line 42 (#1)
    (W misc) A "my", "our" or "state" variable has been redeclared in 
+the current
    scope or statement, effectively eliminating all access to the prev
+ious
    instance.  This is almost always a typographical error.  Note that
+ the
    earlier variable will still exist until the end of the scope or un
+til
    all closure referents to it are destroyed.
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