IT 1100 : Introduction to Operating Systems

Intro

What are Commands

• An executable program (like in /usr/bin)
• A shell command (like cd)
• A shell function (we can write these later)
• An alias

CMDZ

• which (only works for executable programs)
• help (works on shell commands)
• man (Linux manual)
• info (shorter than the manual)
• --help
• whatis (1 line explanation)

Aliases

• alias p='pwd ; ls -CF'
• alias foo='echo hello'

Installing packages

• apt update
• apt upgrade
• apt install <packagename>
• apt search <packagename> #apt can be followed by -cache