How to download a file using curl

How to Download Files with curl

Downloading files with curl is a common and efficient method, especially for command-line environments. Here are the detailed steps to use curl for downloading files:

1. Launch the command-line interface:

   • On Windows, use Command Prompt or PowerShell.
   • On Mac or Linux, open the Terminal.

2. Download files using the basic curl command:

   • The basic command format is: curl -O [URL]
   • The -O option instructs curl to save the downloaded file using the filename from the URL.

   Example:

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

3. Specify the save path for the file:

   • Using the -o (lowercase 'o') option allows you to specify a different filename and/or path.

   Example:

   bash
   curl -o ~/downloads/newfilename.txt https://example.com/file.txt

4. Download large files with curl:

   • For large files, it is recommended to use the --limit-rate option to limit download speed and avoid excessive bandwidth usage.

   Example:

   bash
   curl --limit-rate 1M -O https://example.com/largefile.zip

5. Resume interrupted downloads:

   • If the download is interrupted, use the -C - option to resume from where it left off.

   Example:

   bash
   curl -C - -O https://example.com/largefile.zip

6. Run in silent mode:

   • To avoid displaying any progress information during download, add the -s option.

   Example:

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

Real-world Example

Suppose I have a work scenario where I need to regularly download updated data files from an HTTP server. I can write a simple shell script using the curl command to automate this process. Each time the script runs, it uses curl -O to download the latest data file and save it to a specified directory. By scheduling this script in a cron job, I can ensure daily automatic downloads of the latest files, significantly simplifying data maintenance.

Using curl, I can easily implement file downloads across different operating systems without relying on additional software or tools, enhancing the script's portability and reliability.