Simple Bash Shell Script Examples
Here are some simple Bash shell script examples to help you get started with your new skills. Each script includes a brief explanation of what it does.
1. Hello World
A basic script to print "Hello, World!" to the terminal.
#!/bin/bash
# Print "Hello, World!" to the terminal
echo "Hello, World!"
2. Greeting Script
A script that greets the user by name.
#!/bin/bash
# Ask for the user's name
echo "What is your name?"
read name
# Greet the user
echo "Hello, $name!"
3. Basic Arithmetic
A script to perform basic arithmetic operations.
#!/bin/bash
# Read two numbers from the user
echo "Enter first number:"
read num1
echo "Enter second number:"
read num2
# Perform arithmetic operations
sum=$((num1 + num2))
diff=$((num1 - num2))
prod=$((num1 * num2))
quot=$((num1 / num2))
# Display the results
echo "Sum: $sum"
echo "Difference: $diff"
echo "Product: $prod"
echo "Quotient: $quot"
4. File Existence Check
A script to check if a file exists and display a message.
#!/bin/bash
# File to check
file="example.txt"
# Check if file exists
if [ -e "$file" ]; then
echo "File $file exists."
else
echo "File $file does not exist."
fi
5. Loop Through Numbers
A script that loops through numbers 1 to 5 and prints each number.
#!/bin/bash
# Loop through numbers 1 to 5
for i in {1..5}
do
echo "Number: $i"
done
6. Countdown Timer
A script to create a simple countdown timer.
#!/bin/bash
# Countdown from 10 to 1
for i in {10..1}
do
echo "$i"
sleep 1
done
echo "Time's up!"
7. Directory Listing
A script to list all files in a directory.
#!/bin/bash
# Directory to list
dir="."
# List all files in the directory
echo "Files in $dir:"
ls "$dir"
8. Backup Script
A script to back up a directory.
#!/bin/bash
# Source and destination directories
src="/path/to/source"
dest="/path/to/destination"
# Create a backup
cp -r "$src" "$dest"
echo "Backup of $src completed to $dest"
9. Check Disk Space
A script to check the disk space usage.
#!/bin/bash
# Check disk space usage
echo "Disk space usage:"
df -h
10. Simple To-Do List
A script to manage a simple to-do list.
#!/bin/bash
# To-do list file
todo_file="todo.txt"
# Display menu
echo "1. View to-do list"
echo "2. Add a new item"
echo "3. Exit"
echo "Choose an option:"
read option
case $option in
1)
if [ -e "$todo_file" ]; then
cat "$todo_file"
else
echo "To-do list is empty."
fi
;;
2)
echo "Enter a new to-do item:"
read item
echo "$item" >> "$todo_file"
echo "Item added."
;;
3)
echo "Goodbye!"
exit 0
;;
*)
echo "Invalid option."
;;
esac
