Here's the final code. Any comments appreciated.

while (1 == 1)
{
    
    
     
    #
    #Clear any unused shared memory pages
    #
    print $x++ ."\n";
    
    %oldpids=%newpids;
    
    %newpids=();
        
    select (undef,undef,undef,1.25);

    $presult=`ipcs -m |grep -v - | grep -v bytes | grep -v dest`;
        @parts = split("\n", $presult);
        
    foreach $w (@parts)
        {
        select (undef,undef,undef,0.05) ;
        #print "ipcs: $w\n";
            @pidparts=split(" ", $w);
                $thispid = $pidparts[1];
                $presult1=$pidparts[5];   
                if ($presult1 eq  0)
                {
                    
            $newpids {$thispid} = $thispid;
            print "checking ssh id: pid: -$thispid- current attached -
+$presult1-\n";    
            select (undef,undef,undef,0.05) ;
            
            if ($oldpids{$thispid} == $thispid)
            {
                print "removing ssh id: pid: -$thispid- current attach
+ed -$presult1-\n";
                            $pcmd="ipcrm shm  \"$thispid\"";
                print "pcmd: $pcmd\n";           
                            $presult1 = `$pcmd`;
                print "presult1: $presult1\n";
                select (undef,undef,undef,0.05) ;
            }
                }
                         
        }        

    
}
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