This document provides an introduction to using the command line interface. It covers topics such as the terminal, shell, Bash environment, users such as root, processes, permissions, and finding help. The shell is the command line interpreter, most commonly Bash, and stores environment variables like the prompt. Processes can spawn child processes to perform tasks, and permissions control access to files and directories based on user, group, and other designations. Help is available through the man command.

1. Command line introduction
Rocking in text!

2. Henrik Jönsson
nenn3@twitter.com
henrik.jonzzon@gmail.com
nenne at #drupal on freenode
I work at:
http://www.orestad-linux.se

3. Topics introduced in this session.
Terminal
Shell
Bash environment
Whos root?
Processes
Finding help
Practical examples

4. Quick history of the terminal and Unix
Created in the 60-70s at AT&T.
1 big computer, many terminals.

5. Shell?
Its the command-line interpreter.
Most of us use bash.

6. Bash environment
Example variable:
henrikj@/Users/henrikj$
Stored in $PS1

7. The root user
user/1
sudo [command]

8. Filesystem structure
Filesystem starts at /

9. Permissions
Based on 3 kind of users:
owner group everyone
3 kinds of actions:
Read write execute

10. Permission Examples
Owner Group
-rw-r--r-- henrikj staff 0 Apr 29 20:54 .bashrc
Owner = read, write Dot = hidden
Group = read
Everyone = read
drwx------ henrikj staff 170 Apr 2 13:29 .ssh
d = This is a directory
Owner = read, write, execute

11. Processes
Processes spawns child processes to do their bidding.

12. Process info
UID PID PPID tty CMD
0 1 0 ? /sbin/launchd
User ID
Process ID
Parent PID Command
Terminal

13. HELP!!
man [command]
man man for manual manual

14. Thanks!