Downloading files off of the Internet can be dangerous, so be sure you are downloading from reputable sources. Out of the box, without any command-line arguments, the curl command will fetch a file and display its contents to the standard output. Fetching a file and display its contents is all well and good, but what if you want to actually save the file to your system? You can check on things with the cat command:.
Execute the following command to download the remote robots. Now use the cat command to display the contents of do-bots. If you happened to try to fetch the robots.
You can verify this by using the -I flag, which displays the request headers rather than the contents of the file:. If you do not know the exact value of the offset, do not worry, you just need to specify -C - to tell cURL to automatically find out that value.
If the requested file requires basic authentication, you need to use the -u option followed by the credential which is in the form of user:password :. To read more about basic authentication, you can read the article 3 methods to use basic authentication with cURL.
The cURL command also works on more platforms than the Wget command. Using the cURL command you can specify multiple URLs in the same command line and if the URLs are on the same site all of the URLs for that site will be downloaded using the same connection which is good for performance. This can be used with multiple programming and scripting languages to scrape information from web pages.
Whilst downloading content a progress bar will appear with a download or upload speeds, how long the command has spent running thus far and how long there is still to go. According to this comparison table which compares curl features with other download tools, the cURL command has the following functionality:. The command is designed to work without user interaction.
Oddisee The Good Fight Download. This is a free-for-testing FTP server hosted by Rebex. Use the same command as a moment ago, with the filename appended to it:. In almost all cases, it is going to be more convenient to have the retrieved file saved to disk for us, rather than displayed in the terminal window.
Once more we can use the -O remote file output command to have the file saved to disk, with the same filename that it has on the remote server. The file is retrieved and saved to disk. We can use ls to check the file details. It has the same name as the file on the FTP server, and it is the same length, bytes.
Some remote servers will accept parameters in requests that are sent to them. The parameters might be used to format the returned data, for example, or they may be used to select the exact data that the user wishes to retrieve.
It is often possible to interact with web application programming interfaces APIs using curl. As a simple example, the ipify website has an API can be queried to ascertain your external IP address.
It returns a JSON object describing a book. You can find these on the back cover of most books, usually below a barcode. Especially if the protocol was one of the many not supported by wget.
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