#create the bash script to determine whic Init System
  my $tmpScript = "/tmp/whichSysInit";
  my $whichInit = <<"END";
      #!/bin/bash
      if [[ `/sbin/init --version 2>/dev/null` =~ upstart ]]; then 
          echo using upstart;
      elif [[ `systemctl` =~ -\.mount ]]; then 
          echo using systemd;
      elif [[ -f /etc/init.d/cron && ! -h /etc/init.d/cron ]]; then 
          echo using sysv-init;
      else echo cannot tell; 
      fi

END

  open  OPT, "> $tmpScript";
  print OPT $whichInit;
  close OPT;
  chmod 0555, $tmpScript;

  #run that script to get answer
  my $rslt= `$tmpScript`;
  #unlink $tmpScript; # cleanup

  print " Initialization is $rslt\n";

  #react to the result
  #if ($rslt =~/using\s(?<si>\S+)/){
  #  my $sysInit= $+{si};
  

##</code><code>##

/tmp/whichSysInit: 2: /tmp/whichSysInit: [[: not found
/tmp/whichSysInit: 1: /tmp/whichSysInit: systemctl: not found
/tmp/whichSysInit: 4: /tmp/whichSysInit: [[: not found
/tmp/whichSysInit: 6: /tmp/whichSysInit: [[: not found
Can not determine System Init mechanism <>.
 Exiting