Intro to the shell - Speaker Deck

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Intro to the shell

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What are we going to talk about?

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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Have you ever?

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• If so, you are interacting with “the shell”

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On Unix based systems, it’s everywhere Like JavaScript in browsers

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On Unix based systems, it’s everywhere Like JavaScript in browsers

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In the old days (pre 1973 ) there was only the CLI (Command Line Interface) There was not GUI (Graphical User Interface)

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In the old days (pre 1973 ) there was only the CLI (Command Line Interface) There was no GUI (Graphical User Interface)

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It was this

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Not this

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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)

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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

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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`

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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

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Shell Commands

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Shell Commands

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Shell Commands

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Vim dev_of_athens.sh

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Shell Scripting

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Shell Scripting

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Shell Scripting

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Shell Scripting

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Shell Scripting

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Shell Scripting

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Shell Scripting

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Man • Manual for bash

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Man • Manualk

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What did we going to talk about?

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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Have I ever used the shell? CLI vs GUI Terminal Emulator Shells Shell Commands Shell Scripting Shell Manual

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• http://linuxcommand.org/lts0010.php • https://kb.iu.edu/d/agvf • https://en.wikipedia.org/wiki/ Interpreted_language Sources