perl switch 和case语句

use Net::SMTP;
   use HTTP::Date qw(time2iso str2time time2iso time2isoz);
   my $CurrTime = time2iso(time());
   my $dis_mainpublish='中均资本';
my $menu= <<EOF;
                	DATE:$CurrTime
	--------------------------------------------------
	                $dis_mainpublish
	--------------------------------------------------
	****** 1) "清空发布目录" *******
	****** 2) "获得SQL更新目录" *******
	****** 3) "更新后同步SVN" *******
	****** 4) "退出系统"   *******
EOF

undef @arr1;
undef @arr2;
my $red="e[1;31m";
my $green="e[1;32m";
my $yellow="e[1;33m";
my $normal="e[0m";
print $menu;
print  "please choose [1-2-3-4]:
";
chomp (my $val=<STDIN>);
 use Switch;
        switch ($val) {
             case 1 {
			 print "hints->$red请在svn更新后,在执行2操作$normal
";
		    if   ( -e "C:\update") {system("rd /s/q  C:\update") };

		    unless  ( -e "C:\update"){system("mkdir   C:\update") }
		    
	     }
		     

            case 2         
{
#$dirname = "C:\a1";

$dirname="E:\svn chkout\Database2.0\update_sql\";

opendir ( DIR, $dirname ) || die "Error in opening dir $dirname
";
while( ($filename = readdir(DIR))){

    

	 push @arr1,$filename."
";
}
closedir(DIR);

sort @arr1;
print @arr1;

########################################################################
$dirname = "C:\update_sql";

opendir ( DIR, $dirname ) || die "Error in opening dir $dirname
";
while( ($filename = readdir(DIR))){

    

	 push @arr2,$filename."
";
}
closedir(DIR);
sort @arr2;
print @arr2;



@arr2 = grep {$count{$_} == 1 } grep {++$count{$_}} (@arr1, @arr2);
print "--------增量信息------------
";
print "@arr2
";
use File::Copy::Recursive qw(dircopy);
foreach  (@arr2) {
	print "$_ is $_
";
	chop $_;
 
my $source_dir="E:\svn chkout\Database2.0\update_sql\$_";
my $target_dir="C:\update\$_";
 
my $copy_ret=dircopy($source_dir,$target_dir) or die $!;
}

		

}


            case 3          {system("C:\rsync.bat"); }
            else            { exit; }
        }