To avoid hitting the remote server hard you can limit the download rate you will use. The command to do this is --limit-rate and use like this --limit-rate k. To download you just need to use the basic curl command but add your username and password like this curl --user username:password -o filename. To upload you need to use both the —user option and the -T option as follows. To delete a file from the remote server.
The -X command allows you to send custom commands to the receiving server. If the server you are connecting to requires a cookie then you can send it using curl -b cookiefile. If you want to verify that your SSL cert is valid without using your browser and run into potential caching issues then use curl --cacert mycert. This is also useful if you need to validate the connection to ensure that you are connecting to the right server.
The certificate must be in PEM format. If the optional password is not specified, it will be queried for on the terminal. Say you want to download the HTML for the curl site to view later. For this, we'll use the -o switch like so:. The above command would download the HTML code from the curl site and save it as curl. Of course, curl isn't only capable of downloading source HTML. Say you have a file you want to download from a site.
Curl can handle this like so:. Say for example, you want to download the latest release of Ubuntu Server. That can be done like so:. You can also use curl with an FTP server. Say you need to download a file from an FTP server that happens to be password protected. The command for this would be:. At some point, the curl developers removed SFTP support from the libcurl. If you need to download a file, via SSH, you'll need to use the sftp command.
One of the biggest benefits of curl is that it can be used without interaction. Because of that, it's perfectly suited for scripting.
You could use curl to make another request manually, or you can use the --location or -L argument which tells curl to redo the request to the new location whenever it encounters a redirect. Give it a try:. You can combine the -L argument with some of the aforementioned arguments to download the file to your local system:. Warning : Many resources online will ask you to use curl to download scripts and execute them. You can learn more by viewing the manual page for curl by running man curl.
Where would you like to share this to? Twitter Reddit Hacker News Facebook. Share link Tutorial share link. 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.
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