Proxmox 3.2: Finding the container CTID from the command line

  If you are in a terminal and want to find the container IDs (CTID) quickly without opening up a browser, run the following:  
  It should return a list of the container IDs, the VM state, their IP addresses and hostnames like so:  
      CTID      NPROC STATUS    IP_ADDR         HOSTNAME 100         25 running 101         17 running 102         58 running 103         15 running 104         52 running
Quick and easy.