COMP 206 Chapter Notes - Chapter 2: Unix Shell, Root Directory, Working Directory

• School: McGill University
• Department: Computer Science (Sci)
• Course: COMP 206
• Professor: Joseph P Vybihal

Document Summary

Software systems, by joseph vybihal & danielle azar. Unix os following either a script interpreter instruction, executable program or when the user types enter into the command line: a switch modifies the precise functions of a command, often indicated by a - followed by a letter/symbol. The same switch can have completely different effects across commands: arguments are information that the user puts in, knowing that the computer would have asked for this extra information anyway. Man (command) displays information to the user about the given command, like information about switches for example. Passwd used to change user"s password. Logout ends the user"s unix shell session. Date displays the root system"s current date and time. Who shows a list of users with active sessions on the system. Write (userid message) send a message to this userid ls shows files and directories in current working directory: ls path shows files and directories in the indicated path.