Learning Mac Computers - Backup, Storage and Sharing
http://edu-observatory.org/olli/Mac_Computers/Week7.html   or   index.html

Managing Your Digital Stuff - Backups
  http://edu-observatory.org/olli/Apple_Resources/Backups.html

Apple Resources - Sharing Files
  http://edu-observatory.org/olli/Apple_Resources/Sharing_Files.html

Managing Your Digital Stuff - Updates
  http://edu-observatory.org/olli/Apple_Resources/Updates.html

Apple Resources - Command Line Tools
  http://edu-observatory.org/olli/Apple_Resources/Command_Line_Tools.html

  What's my IPv4 address (as seen brom the outside)?
    timelimit -q -t 1 dig -4 -t a    +short myip.opendns.com @resolver1.opendns.com
  
  What's my IPv6 address?
    timelimit -q -t 1 dig -6 -t aaaa +short myip.opendns.com @resolver1.opendns.com
  
  What devices are on my local area network?
    arp -an 
    sudo nmap -T5 -sP `en6`/24 | sed s."Nmap"."\nNmap".g | sed s."Nmap scan report for"."  sudo nmap -sS -T5".g
  
  How long since my computer rebooted? macOS version?
    uptime
    sw_vers
  
  Secure Shell (remote login) to another computer 
    ssh spooner1@quebec.he.net
    ssh spooner1@65.49.50.2
    ssh spooner1@2001:470:0:1d5::2
 
  Check Mediacom
    ty mc
    mc
    
  Check the Internet
    ty wan  
    wan
  
  Check my internet route to dns.google
    mtr --aslookup --show-ips -4 dns.google
    mtr --aslookup --show-ips -6 dns.google

  cal
  
  


  
  
  

 
    sam.wormley@gmail.com