The Command Line Interface (CLI)
GUI vs CLI
- GUI
- Graphical User Interface
- CLI
- Command Line Interface
- API
- Application Programming Interface
Why use the CLI?
- Great for administration
- Much greater power and control
- Great for repetitive/recurring tasks
- Operating systems already implement many useful programs
- Take advantage!
Linux Bash Basics
Directory Structure
- System root is
/ - Absolute Path/Relative Path?
- File Permissions/Access
Linux Bash Basics
Basic Commands
- ls
- List files in your directory
- pwd
- Print your current path
- cd path
- Change context to a different directory
- cp path1 path2
- Copy a file
- mv path path
- Move or rename a file
- rm path
- Unallocate space used by a file
- rmdir path
- Delete an empty directory
- mkdir path
- Create a new directory
- cat path
- Display the contents of a text file
- echo string
- Display a string to the screen
- grep
- Search for a string within the file system
Bash Scripting (Hello World)
- Linux Bash Intermediate, commands:
- man / info
- more, less, head, tail
- grep exercises with c (count), v (inverse), various flags
- uniq, sort, cut (awk / sed)
- ps, top, pkill
- hexdump
- mount,df, du
- diff, md5sum
-
Linux Bash Intermediate: Redirection/Piping/Logical Branching
-
Linux Bash Advanced: Environment variables
- Configuration files
- /etc
- hidden home files (starts with
.)
- Alternate/Embedded CLIs
Many times, programs will present their own CLI to the user (independent of OS); often these are called consoles, console-mode, or interpreter-mode
- ftp
- mysql
- sqlite
- netsh
- irc
- PYTHON!!