The programm is working now! I developed a monitoring application for linux. I have other arrays with info about each process that I get from the proc fs...This might help to understand: 
sub get_data_from_proc_fs{
opendir(PROC,"/proc");
@PROC = readdir PROC;
closedir(PROC);
@pid = grep /[0-9]/, @PROC;
for($k=0;$k<@PID;$k++){
    open(STAT,"<","/proc/$PID[$k]/stat");
    ($STAT) = <STAT>;
    push(@app,(split(" ",$STAT))[1]);
    push(@pgrp,(split(" ",$STAT))[4]);
    close(STAT);
    open(CMDLINE,"<","/proc/$PID[$k]/cmdline") ;
    ($CMDLINE) = <CMDLINE>;
    push(@cmd,$CMDLINE);
    close(CMDLINE);
}

$/ = "\0";
chomp(@cmd);
$/ = "\n";

}
#####some code here#
    &get_data_from_proc_fs ;
    &get_system_date ;
    $a = 0 ;
    $PROC_FS_NEW = 0 ;
    while( $a < $PS_MONITOR ){
    $b = 0 ;
    $found = 0 ;
    while( $b < $PS_PROC_FS ){
        if( ($cmd_monitor[$a] eq $cmd[$b]) && ($pgrp[$b] eq $pid[$b]) 
+){
        if( $first_time == 1 ){
            $status = "NORMAL" ;
            $process = "${app[$b]}_${pid[$b]}" ;
            &print_status_info($process,$cmd[$b],$pid[$b]) ;
            $found++ ;
        }
        &save_info_about_running_processes_to_monitor ;
        $PROC_FS_NEW++ ;
        }
        $b++ ;
    }
    if(( $found == 0 ) && ( $first_time == 1 )){
        $status = "ERROR" ;
        &print_status_info($app_m[$a],$cmd_m[$a]) ;
    }
    $a++ ;
#####code continues...#

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In reply to Re^4: Equal strings don't match! by pl
in thread Equal strings don't match! by pl

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