Learn Bash - 10 Code Examples & CST Typing Practice Test

Bash (Bourne Again SHell) is a Unix shell and command language widely used for automation, scripting, DevOps, system administration, and shell-based application workflows. It is the default shell on most Linux systems and offers powerful command-line capabilities.

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Bash Counter and Theme Toggle Bash Simple Calculator Bash Factorial Bash Fibonacci Sequence Bash Array Comprehension Simulation Bash String Manipulation Bash Loop and Conditional Bash Functions with Arguments Bash Sum of Array Bash Zip Simulation

Learn BASH with Real Code Examples

Updated Nov 19, 2025

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Code Sample Descriptions

Bash Counter and Theme Toggle

count=0
isDark=0

updateUI() {
    echo "Counter: $count"
    echo "Theme: $( [ $isDark -eq 1 ] && echo 'Dark' || echo 'Light' )"
}

increment() { count=$((count + 1)); updateUI; }
decrement() { count=$((count - 1)); updateUI; }
reset() { count=0; updateUI; }
toggleTheme() { isDark=$((1 - isDark)); updateUI; }

# Simulate actions
updateUI
increment
increment
toggleTheme
decrement
reset

Demonstrates a simple counter with theme toggling using Bash variables and console output.

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Bash Simple Calculator

add() { echo $(( $1 + $2 )); }
subtract() { echo $(( $1 - $2 )); }
multiply() { echo $(( $1 * $2 )); }
divide() { echo $(( $1 / $2 )); }

echo "Add 5 + 3: $(add 5 3)"
echo "Subtract 5 - 3: $(subtract 5 3)"
echo "Multiply 5 * 3: $(multiply 5 3)"
echo "Divide 6 / 2: $(divide 6 2)"

Performs basic arithmetic operations using functions.

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Bash Factorial

factorial() {
    if [ $1 -le 1 ]; then
        echo 1
    else
        echo $(( $1 * $(factorial $(( $1 - 1 ))) ))
    fi
}

echo "Factorial of 5: $(factorial 5)"

Recursive factorial calculation.

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Bash Fibonacci Sequence

fibonacci() {
    if [ $1 -eq 0 ]; then
        echo 0
    elif [ $1 -eq 1 ]; then
        echo 1
    else
        echo $(( $(fibonacci $(( $1 - 1 ))) + $(fibonacci $(( $1 - 2 ))) ))
    fi
}

for i in {0..9}; do
    echo $(fibonacci $i)
done

Generate Fibonacci numbers using recursion.

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Bash Array Comprehension Simulation

numbers=(1 2 3 4 5 6 7 8 9 10)
squares=()
for n in "${numbers[@]}"; do
    if [ $((n % 2)) -eq 0 ]; then
        squares+=( $((n * n)) )
    fi
done
    echo "${squares[@]}"

Create array of squares for even numbers.

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Bash String Manipulation

str="HelloWorld"
sub=${str:0:5}
len=${#str}
echo "Substring: $sub, Length: $len"

Demonstrates substring extraction and length.

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Bash Loop and Conditional

for i in {1..10}; do
    if [ $((i % 2)) -eq 0 ]; then
        echo "$i is even"
    fi
done

Loop through numbers and print even ones.

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Bash Functions with Arguments

greet() {
    echo "Hello, $1!"
}

greet Alice
greet Bob

Pass arguments to functions and print results.

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Bash Sum of Array

numbers=(1 2 3 4 5)
sum=0
for n in "${numbers[@]}"; do
    sum=$((sum + n))
done
    echo $sum

Sum elements of an array using a loop.

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Bash Zip Simulation

arr1=(1 2 3)
arr2=(4 5 6)
for i in ${!arr1[@]}; do
    echo "$((arr1[i] + arr2[i]))"
done

Combine two arrays element-wise using a loop.

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Frequently Asked Questions about Bash

What is Bash?

What are the primary use cases for Bash?

System automation. Server maintenance scripts. DevOps & CI/CD pipelines. File management & text processing. Docker and container orchestration. Environment setup. Scheduling cronjobs

What are the strengths of Bash?

Installed nearly everywhere. Perfect for automation. Integrates with all Unix tools. Simple for small scripts. Ideal for CI/CD and DevOps

What are the limitations of Bash?

Not suitable for large-scale applications. Weak type system. Difficult debugging. Portability issues across shells. Limited data structures

How can I practice Bash typing speed?

CodeSpeedTest offers 10+ real Bash code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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Code Sample Descriptions

Bash Counter and Theme Toggle

count=0
isDark=0

updateUI() {
    echo "Counter: $count"
    echo "Theme: $( [ $isDark -eq 1 ] && echo 'Dark' || echo 'Light' )"
}

increment() { count=$((count + 1)); updateUI; }
decrement() { count=$((count - 1)); updateUI; }
reset() { count=0; updateUI; }
toggleTheme() { isDark=$((1 - isDark)); updateUI; }

# Simulate actions
updateUI
increment
increment
toggleTheme
decrement
reset

Demonstrates a simple counter with theme toggling using Bash variables and console output.

Let’s Try →

Bash Simple Calculator

add() { echo $(( $1 + $2 )); }
subtract() { echo $(( $1 - $2 )); }
multiply() { echo $(( $1 * $2 )); }
divide() { echo $(( $1 / $2 )); }

echo "Add 5 + 3: $(add 5 3)"
echo "Subtract 5 - 3: $(subtract 5 3)"
echo "Multiply 5 * 3: $(multiply 5 3)"
echo "Divide 6 / 2: $(divide 6 2)"

Performs basic arithmetic operations using functions.

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Bash Factorial

factorial() {
    if [ $1 -le 1 ]; then
        echo 1
    else
        echo $(( $1 * $(factorial $(( $1 - 1 ))) ))
    fi
}

echo "Factorial of 5: $(factorial 5)"

Recursive factorial calculation.

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Bash Fibonacci Sequence

fibonacci() {
    if [ $1 -eq 0 ]; then
        echo 0
    elif [ $1 -eq 1 ]; then
        echo 1
    else
        echo $(( $(fibonacci $(( $1 - 1 ))) + $(fibonacci $(( $1 - 2 ))) ))
    fi
}

for i in {0..9}; do
    echo $(fibonacci $i)
done

Generate Fibonacci numbers using recursion.

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Bash Array Comprehension Simulation

numbers=(1 2 3 4 5 6 7 8 9 10)
squares=()
for n in "${numbers[@]}"; do
    if [ $((n % 2)) -eq 0 ]; then
        squares+=( $((n * n)) )
    fi
done
    echo "${squares[@]}"

Create array of squares for even numbers.

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Bash String Manipulation

str="HelloWorld"
sub=${str:0:5}
len=${#str}
echo "Substring: $sub, Length: $len"

Demonstrates substring extraction and length.

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Bash Loop and Conditional

for i in {1..10}; do
    if [ $((i % 2)) -eq 0 ]; then
        echo "$i is even"
    fi
done

Loop through numbers and print even ones.

Let’s Try →

Bash Functions with Arguments

greet() {
    echo "Hello, $1!"
}

greet Alice
greet Bob

Pass arguments to functions and print results.

Let’s Try →

Bash Sum of Array

numbers=(1 2 3 4 5)
sum=0
for n in "${numbers[@]}"; do
    sum=$((sum + n))
done
    echo $sum

Sum elements of an array using a loop.

Let’s Try →

Bash Zip Simulation

arr1=(1 2 3)
arr2=(4 5 6)
for i in ${!arr1[@]}; do
    echo "$((arr1[i] + arr2[i]))"
done

Combine two arrays element-wise using a loop.

Let’s Try →

Frequently Asked Questions about Bash

What is Bash?

What are the primary use cases for Bash?

System automation. Server maintenance scripts. DevOps & CI/CD pipelines. File management & text processing. Docker and container orchestration. Environment setup. Scheduling cronjobs

What are the strengths of Bash?

Installed nearly everywhere. Perfect for automation. Integrates with all Unix tools. Simple for small scripts. Ideal for CI/CD and DevOps

What are the limitations of Bash?

Not suitable for large-scale applications. Weak type system. Difficult debugging. Portability issues across shells. Limited data structures

How can I practice Bash typing speed?

CodeSpeedTest offers 10+ real Bash code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.