Bash, the Bourne Again Shell, is the default command-line interpreter in most Linux distros.

Programmers often learn new languages via learning the hello world program. It’s a simple program that prints the string “Hello World” to the standard output.

Use an editor like vim or nano to create the file hello-world.sh and copy the below lines into it.

#!/bin/bash
echo "Hello World"

Save and quit the file.

You need to make this file executable using the below command.

chmod a+x hello-world.sh

You can run this using any of the below two commands.

bash hello-world.sh
./hello-world.sh

It will print out the string passed to echo inside the script.

Aliases

Append a string after each line

Arithmetic evaluation and errexit trap

Assign Output of Shell Command To Variable

Brackets

Built-in variables

cat

Commands

cut

Dangerous Commands

Find largest files

Find new files

Functions

The IFS (internal field separator)

Helicopter Animation

List files by size

List files excluding some files

Parse a line from a file

Quotes

Read a file (data stream, variable) line-by-line (and/or field-by-field)

Redirect Output To File, And Still Have It On Screen

Rename multiple files

rev

Run a program in the background

Scripts

ShellCheck

Shellshock

tac