That shouldn't even compile/run: 
Global symbol "$cmd1" requires explicit package name at try4.pl line 3.
Global symbol "$cmd1" requires explicit package name at try4.pl line 4.
Global symbol "$cmd" requires explicit package name at try4.pl line 5.
Global symbol "$cmd1" requires explicit package name at try4.pl line 6.
Apart from not using "my" to declare your variables, notice that you reference $cmd, which isn't actuallly declared/assigned to anywhere.

In reply to Re: System command problem in perl by mjscott2702
in thread System command problem in perl by vr786

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