- 01Setting up (what you'll need)
- 02Your first shell script (echo)
- 03Using variables
- 04Command-line arguments ($1, $2 ...)
- 05Branching (the if statement)
- 06Repeating (the for loop)
- 07Repeating (the while loop)
- 08Writing your own function
- 09Working with arrays
- 10Command substitution ($())
- 11Working with strings (parameter expansion)
- 12Reading from standard input (read)
- 13Exit status and && / ||
- 14Pipes and redirection
- 15The case statement
- 16Arithmetic ($(( )))
- 17The basics of grep, sed and awk
- 18Argument checks and error handling
- 19Function return values and exit codes
- 20[Project] Build a small log-tallying script
Your first shell script (echo)
This lesson covers the basics of printing in a shell script with echo.
echo "..." displays text on the screen. The #!/bin/bash at the top of a script file is called the shebang, and it is the special line that tells the operating system to run this file with bash.
In the sample code, the line after #!/bin/bash is a single echo "Hello, Shell Script!".
A common early stumble is forgetting to grant execute permission. To run a script you have written as ./script.sh, you first have to give it permission with chmod +x script.sh.
In professional work, shell scripts are an indispensable tool for infrastructure engineers — routine server maintenance, automating deployments, and so on.
๐งช This site can't compile or run Shell Script directly, so it checks on the spot whether what you typed matches the reference code (scoring happens entirely in your browser โ nothing is sent anywhere).