Learn Curl - 10 Code Examples & CST Typing Practice Test

cURL is a command-line tool and library for transferring data with URLs. It supports a vast range of protocols (HTTP, HTTPS, FTP, SMTP, SFTP, etc.) and is widely used for API testing, automation, network debugging, and data transfers.

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cURL Counter Simulation and Theme Toggle cURL Simple GET Request cURL POST Request with JSON cURL Download File cURL Upload File cURL Authentication cURL Headers Example cURL Save Response to File cURL Follow Redirects cURL Timeout Example

Learn CURL with Real Code Examples

Updated Nov 21, 2025

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Code Sample Descriptions

cURL Counter Simulation and Theme Toggle

count=0
isDark=0

updateUI() {
    echo "Counter: $count"
    if [ $isDark -eq 1 ]; then
        echo "Theme: Dark"
    else
        echo "Theme: Light"
    fi
}

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

# Example API call using cURL
# curl -X GET https://api.example.com/data -H "Authorization: Bearer TOKEN"

Demonstrates a simulated counter and theme toggle using cURL commands with local shell variables.

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cURL Simple GET Request

curl -X GET https://api.example.com/data

Performs a simple GET request using cURL.

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cURL POST Request with JSON

curl -X POST https://api.example.com/data \
-H "Content-Type: application/json" \
-d '{"name":"John","age":30}'

Sends JSON data in a POST request using cURL.

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cURL Download File

curl -O https://example.com/file.txt

Downloads a file from a URL.

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cURL Upload File

curl -X POST https://api.example.com/upload \
-F 'file=@/path/to/localfile.txt'

Uploads a file to a server using cURL.

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cURL Authentication

curl -u username:password https://api.example.com/data

Performs a request with basic authentication.

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cURL Headers Example

curl -H "Authorization: Bearer TOKEN" -H "Accept: application/json" https://api.example.com/data

Sends custom headers in a cURL request.

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cURL Save Response to File

curl https://api.example.com/data -o response.json

Saves the response of a cURL request to a local file.

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cURL Follow Redirects

curl -L https://short.url/example

Follows HTTP redirects automatically.

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cURL Timeout Example

curl --max-time 10 https://api.example.com/data

Sets a timeout for the cURL request.

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Frequently Asked Questions about Curl

What is Curl?

What are the primary use cases for Curl?

Calling REST APIs. Downloading or uploading files. Testing authentication flows. Debugging servers with verbose network logs. Automating data transfers

What are the strengths of Curl?

Massive protocol support. Perfect for API testing. Works everywhere (Linux, macOS, Windows). Reliable and stable for decades. Zero dependencies for most OS installs

What are the limitations of Curl?

Verbose syntax for complex operations. Not a programming language. Hard to read multi-flag commands. Limited JSON parsing (needs jq). Not ideal for browser-style sessions

How can I practice Curl typing speed?

CodeSpeedTest offers 10+ real Curl 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

cURL Counter Simulation and Theme Toggle

count=0
isDark=0

updateUI() {
    echo "Counter: $count"
    if [ $isDark -eq 1 ]; then
        echo "Theme: Dark"
    else
        echo "Theme: Light"
    fi
}

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

# Example API call using cURL
# curl -X GET https://api.example.com/data -H "Authorization: Bearer TOKEN"

Demonstrates a simulated counter and theme toggle using cURL commands with local shell variables.

Let’s Try →

cURL Simple GET Request

curl -X GET https://api.example.com/data

Performs a simple GET request using cURL.

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cURL POST Request with JSON

curl -X POST https://api.example.com/data \
-H "Content-Type: application/json" \
-d '{"name":"John","age":30}'

Sends JSON data in a POST request using cURL.

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cURL Download File

curl -O https://example.com/file.txt

Downloads a file from a URL.

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cURL Upload File

curl -X POST https://api.example.com/upload \
-F 'file=@/path/to/localfile.txt'

Uploads a file to a server using cURL.

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cURL Authentication

curl -u username:password https://api.example.com/data

Performs a request with basic authentication.

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cURL Headers Example

curl -H "Authorization: Bearer TOKEN" -H "Accept: application/json" https://api.example.com/data

Sends custom headers in a cURL request.

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cURL Save Response to File

curl https://api.example.com/data -o response.json

Saves the response of a cURL request to a local file.

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cURL Follow Redirects

curl -L https://short.url/example

Follows HTTP redirects automatically.

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cURL Timeout Example

curl --max-time 10 https://api.example.com/data

Sets a timeout for the cURL request.

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Frequently Asked Questions about Curl

What is Curl?

What are the primary use cases for Curl?

Calling REST APIs. Downloading or uploading files. Testing authentication flows. Debugging servers with verbose network logs. Automating data transfers

What are the strengths of Curl?

Massive protocol support. Perfect for API testing. Works everywhere (Linux, macOS, Windows). Reliable and stable for decades. Zero dependencies for most OS installs

What are the limitations of Curl?

Verbose syntax for complex operations. Not a programming language. Hard to read multi-flag commands. Limited JSON parsing (needs jq). Not ideal for browser-style sessions

How can I practice Curl typing speed?

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