Intro to the shell

Introduction to shell, command line interface, terminal emulation, and shell scripting at Developers of Athens Meetup on Sept. 1, 2015

Transcript

1. Intro to the shell
2. What are we going to talk about?
3. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
4. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
5. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
6. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
7. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
8. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
9. Have you ever?
16. • If so, you are interacting with “the shell”
17. On Unix based systems, it’s everywhere Like JavaScript in browsers
18. On Unix based systems, it’s everywhere Like JavaScript in browsers
19. In the old days (pre 1973 ) there was only the CLI (Command Line Interface) There was not GUI (Graphical User Interface)
20. In the old days (pre 1973 ) there was only the CLI (Command Line Interface) There was no GUI (Graphical User Interface)
21. It was this
22. Not this
23. An aside • In 1973, Xerox PARC developed the Alto personal computer. • It had a bitmapped screen, and was the first computer to have a graphical user interface (GUI)
24. Terminal Emulator • Allows you to access the “Shell session” • The terminal emulator (often just called terminal) the “terminal window”. • When you type characters in the window, the terminal • draws these characters in the window • Sends them to the shell's (or other program's) stdin. • Shell executes • Sends output to stdout and stderr • These get sent to the terminal • Terminal draws these characters in the window. • Terminal, iTerm, Konsole, etc
25. Shells .sh (bash “Bourne Again SHell) .csh (C shell) .ksh (KornShell) .tsch (“tee-cee-shell") .zsh (Z shell) • On most Linux systems there are several shells available • They all offer similar functionality, but different syntax and capabilities • Most shells are descendants of bash (Bourne Again SHell) , `sh` • First bash • then `csh` (C shell) • `bash`, `ksh`, `tsch`, and `zsh`
26. Shell Commands • Most shells double as interpreted programming languages • “Interpretted language” • An interpreted language is a programming language execute instructions directly, without previously compiling a program into machine-language instructions
27. Shell Commands
28. Shell Commands
29. Shell Commands
30. Vim dev_of_athens.sh
31. Shell Scripting
32. Shell Scripting
33. Shell Scripting
34. Shell Scripting
35. Shell Scripting
36. Shell Scripting
37. Shell Scripting
38. Man • Manual for bash
39. Man • Manualk
40. What did we going to talk about?
41. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
42. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
43. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
44. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
45. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
46. Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual
47. • http://linuxcommand.org/lts0010.php • https://kb.iu.edu/d/agvf • https://en.wikipedia.org/wiki/ Interpreted_language Sources