Unix access in the 1970s-1980s Each monitor+keyboard directly connected to server HW (serial line) Multi-user Program on mainframe that lets you “talk”

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Presentation transcript:

Unix access in the 1970s-1980s Each monitor+keyboard directly connected to server HW (serial line) Multi-user Program on mainframe that lets you “talk” to Unix via your keyboard is “shell” Monitor is very low level No graphics at all Just displays characters (Courtesy Amdahl Corp)

Unix Access today: ssh program Takes input from your keyboard and sends to shell process on Linux machine Displays characters sent to it by the shell process Communicates via standard TCP/IP network protocol Talks via a server-side piece of ssh that connects it to a shell process (probably creating one at beginning)