You can use last to jump out the loop when you get the input you want: 
while(defined($input = <>))) {
    chomp $input;
    if ($input eq 'yes')
    {
        print "Yes entered for system.\n";
        last;
    }
    elsif ($input eq 'no') {
        print "No entered for system.\n";
        last;
    }
}

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In reply to Re: While loop by thelenm
in thread While loop by Anonymous Monk

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