example:  knock myserver.example.com 123:tcp 456:udp 789:tcp                                                                                                    admin@i-080ac908debd2d3d7:~$ knock -v 127.0.0.1 80:tcp 1                        hitting tcp 127.0.0.1:80                                                        hitting tcp 127.0.0.1:1                                                         admin@i-080ac908debd2d3d7:~$ knock -v 127.0.0.1 80:tcp                          hitting tcp 127.0.0.1:80                                                        admin@i-080ac908debd2d3d7:~$ curl -D - -v localhost                             *   Trying 127.0.0.1:80...                                                      * connect to 127.0.0.1 port 80 failed: Connection refused                       * Failed to connect to localhost port 80: Connection refused                    * Closing connection 0                                                          curl: (7) Failed to connect to localhost port 80: Connection refused            admin@i-080ac908debd2d3d7:~$ nc -vv 12                                          

Bristol_Street            Esther_Road            Jacob_Street            New_ParBroad_Canal_Street        Estrella_Street        Jacqueline_Road         NewcastBrookdale_Street          Eugenia_Road           Jamaica_Place           NewcrofBrookline_Avenue          Fairfield_Street       Jersey_Street           North_WBuckingham_Place          Faunce_Road            Jeshurun_Street         Norton_Burwell_Road              Fay_Street             John_Alden_Road         Oak_HilCadbury_Road              Fayston_Street         Judge_Street            Oak_PlaCardinal_Medeiros_Avenue  Fessenden_Street       June_Street             Oakley_admin@i-01d42ed291a2a9471:~/clmystery/mystery$ cat people | grep "Aron Pilhofer"Aron Pilhofer   M       16      Claybourne Street, line 145                     admin@i-01d42ed291a2a9471:~/clmystery/mystery$ cat -n streets/Claybourne_Street    145  SEE INTERVIEW #1767435                                                  admin@i-01d42ed291a2a9471:~/clmystery/mystery$ cat people | grep "Joe Germuska" Joe Germuska    M       65      Plainfield Street, line 275                     admin@i-01d42ed291a2a9471:~/clmystery/mystery$ cat -n streets/Plainfield_Street 

admin@i-069dccffc946a3ae0:~$ curl localhost:5000                                Unauthorizedadmin@i-069dccffc946a3ae0:~$ nc                                     

Filesystem      Size  Used Avail Use% Mounted on                                /dev/nvme0n1p1  7.7G  6.1G  1.2G  84% /                                         admin@i-0dd51af12565f72d9:~$ ls -i                                              264663 agent  278531 data  264701 datafile  264672 kihei                        admin@i-0dd51af12565f72d9:~$ dg -i                                              bash: dg: command not found                                                     admin@i-0dd51af12565f72d9:~$ df -i                                              Filesystem      Inodes IUsed  IFree IUse% Mounted on                            udev             55457   307  55150    1% /dev                                  tmpfs            58292   442  57850    1% /run                                  /dev/nvme0n1p1  516096 32800 483296    7% /                                     tmpfs            58292     4  58288    1% /dev/shm                              tmpfs            58292     3  58289    1% /run/lock                             /dev/nvme0n1p15      0     0      0     - /boot/efi                             admin@i-0dd51af12565f72d9:~$ df -