Sweet Libs Language: Bash Linux CLI

Team: Naomi & James

INTRO AND HISTORY:

What Is "The Shell"?

Simply put, the shell is a program that takes commands from the keyboard and gives them to the operating system to perform. In the old days, it was the only user interface available on a Unix-like system such as Linux. Nowadays, we have graphical user interfaces (GUIs) in addition to command line interfaces (CLIs) such as the shell.

On most Linux systems a program called bash (which stands for Bourne Again SHell, an enhanced version of the original Unix shell program, sh, written by Steve Bourne) acts as the shell program. Besides bash, there are other shell programs that can be installed in a Linux system. These include: ksh, tcsh and zsh. https://en.wikipedia.org/wiki/Stephen_R._Bourne

Bash is a unix based shell created by a programmer named Brian Fox while he worked for the Free Software Foundation. https://en.wikipedia.org/wiki/Brian_Fox_(computer_programmer)

What's A "Terminal?"

It's a program called a terminal emulator. This is a program that opens a window and lets you interact with the shell. There are a bunch of different terminal emulators you can use. Most Linux distributions supply several, such as: gnome-terminal, konsole, xterm, rxvt, kvt, nxterm, and eterm.

While there are a number of different terminal emulators, they all do the same thing. They give you access to a shell session.

(http://linuxcommand.org/lc3_lts0010.php)

FUN GAMES:

1. TETRIS

cd home
type: emacs
press enter to open
press Esc
type x
type tetris
play!

(this is what the shell script looks like to run this game: https://www.linuxquestions.org/questions/programming-9/tetris-game-based-on-a-shell-script-new-algorithm-911496-print/)

2. SNAKE:

cd home
type emacs -q --no-splash -f snake
play!

3. MAKE TERMINAL TALK:

cd home
type say {words to talk}
hit enter
make sure volume is turned on!
have fun :)

4. WATCH STAR WARS:

cd home
type telnet towel.blinkenlights.nl
hit enter
enjoy!

To exit emacs:

hit esc
type control + x
hit enter
type ontrol + c
hit enter

HELLO WORLD:

Step 1:

Open your text editor and create a new plain text named HelloWorld.sh.
In order to save as plain text using textEdit, go to format and change to: make plain text.

Step 2:

All scripts must begin with the shabang(#!) and since we are using bash, line 1 will look like this.
#!/bin/bash
Add the following code under the shebang line

greeting=Hello\ World

function greet { echo $greeting }

greet

Save your HelloWorld.sh file.

Step 3:

In order to run your script you will need to compile it first.
Open your terminal and point the terminal to the folder that is holding the HelloWorld.sh file.
If you saved HelloWorld.sh to your documents folder you would type:
cd ~/documents

Step 4:

In order to compile your script, inside the folder holding the HelloWord.sh file type:
chmod +x ./HelloWorld.sh

Step 5:

After everything is done you can type:
./HelloWorld.sh
and you get a response of "Hello World"!

COMMANDS-TO-SAVE:

NOTE: Most commands operate like this:

command -options arguments

Command is the name of the command, -options is one or more adjustments to the command's behavior, arguments is one or more "things" upon which the command operates

pwd = print working directory
cd = change directory
ls = list the files in the working directory
ls /bin = list the files in the /bin directory
ls -l = list the files in the working directory in long format
ls -lah = List all files with permissions
cp = copy files and directories
mv = move or rename files and directories
rm = remove files and directories
mkdir = create directories

ADDITIONAL RESOURCES:

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