Curl is an acronym for Client URL. It is a tool that can be used from the command line to transfer data between your machine and a network server, employing any of the protocols it supports. These protocols include HTTP, HTTPS, FTP, FTPS, SCP, SFTP, DICT, and others. Basically, if there’s a common protocol, Curl probably supports it!<\/p>\n
Curl is especially popular for working with HTTP and HTTPS – which are the protocols web browsers use to access web pages. However, unlike a web browser, Curl doesn’t have a graphical user interface. Everything is done through the command line, which makes it very powerful for automation scripts and testing.<\/p>\n
Why Use Curl?<\/strong><\/h2>\n\n- Simplicity and Flexibility<\/strong>: Curl is simple to use. Even with just the curl<\/strong> command followed by a URL, you can recover information. It also has a multitude of options that cater to various requirements, making it highly flexible.<\/li>\n
- Support for Multiple Protocols<\/strong>: As mentioned, Curl supports a wide array of protocols. This means that you can use it not just for web pages but for interacting with FTP servers, sending emails (SMTP), and much more.<\/li>\n
- Data Transfer<\/strong>: You can use Curl to download and upload files. Whether it’s a single file or content from an entire web page, Curl has got you covered.<\/li>\n<\/ul>\n
Installing Curl<\/strong><\/h2>\nNow that we understand what Curl is and why it’s an essential tool for handling web data, it’s time to get it installed on our Linux systems. Curl is widely supported and can be installed on various Linux distributions.<\/p>\n
On Debian-based Systems<\/strong><\/h3>\nIf you are operating on a Debian-based Linux distribution, like Ubuntu or Debian itself, the curl installation can be done using the apt-get<\/strong> command. Install curl by executing:<\/p>\nsudo<\/span> apt-get install<\/span> curl<\/div><\/div>\n![](\"http:\/\/linuxways.net\/wp-content\/uploads\/2023\/06\/word-image-19666-1.png\")
<\/em><\/strong><\/p>\nOn Red Hat-based Systems<\/strong><\/h2>\nIn case you are using a Red Hat-based Linux distribution like CentOS or Fedora, the installation process is equally simple but uses a different package manager called yum<\/strong>. Install curl by executing:<\/p>\nsudo<\/span> yum install<\/span> curl<\/div><\/div>\nVerify Installation<\/strong><\/h3>\nIn both cases, after installation is complete, you can check the Curl version to confirm it was installed correctly. The code is:<\/p>\n
curl --version<\/span><\/div><\/div>\n![](\"http:\/\/linuxways.net\/wp-content\/uploads\/2023\/06\/word-image-19666-2.png\")
<\/p>\n
Basic Curl Commands<\/strong><\/h2>\nAlright, let\u2019s now start with some of the basic commands that will get you up and running.<\/p>\n
1: Retrieve a Web Page<\/strong><\/h3>\nCurl’s most basic application is to fetch a web page. Instead of entering a website address into your browser, you can use Curl to directly retrieve the same page from your terminal. Here\u2019s how you do it:<\/p>\n
curl http:\/\/<\/span>example.com<\/div><\/div>\nThis will display the HTML content of the page in your terminal. If you just want to check if the page is accessible and don’t want to see all the HTML code, you can use the -I<\/strong> option to fetch just the headers.<\/p>\ncurl -I<\/span> http:\/\/<\/span>google.com<\/div><\/div>\n![](\"http:\/\/linuxways.net\/wp-content\/uploads\/2023\/06\/word-image-19666-3.png\")
<\/em><\/strong><\/p>\n2: Download Files<\/strong><\/h3>\nYou can also use this command to download a file directly from the terminal. Use the -O<\/strong> option and specify the URL of the file.<\/p>\ncurl -O<\/span> http:\/\/<\/span>example.com\/<\/span>file.zip.<\/div><\/div>\n![](\"http:\/\/linuxways.net\/wp-content\/uploads\/2023\/06\/word-image-19666-4.png\")
<\/em><\/p>\n3: Save Output to a File<\/strong><\/h3>\nWhen you use Curl to fetch a web page, it displays the content in the terminal. If you want to save this content to a file, use the -o<\/strong> option.<\/p>\ncurl -o<\/span> output.html http:\/\/<\/span>example.com<\/div><\/div>\n![](\"http:\/\/linuxways.net\/wp-content\/uploads\/2023\/06\/word-image-19666-5.png\")
<\/em><\/p>\nThis command will save the HTML content of the web page to a file called output.html.<\/p>\n
4: Limit the Transfer Rate<\/strong><\/h3>\nThere may be situations where you don’t want Curl to use all your bandwidth. Maybe you are doing something else that’s more important. Use –limit-rate<\/strong> to limit the transfer rate.<\/p>\ncurl --limit-rate<\/span> 100K -O<\/span> http:\/\/<\/span>example.com\/<\/span>largefile.zip<\/div><\/div>\n![](\"http:\/\/linuxways.net\/wp-content\/uploads\/2023\/06\/word-image-19666-6.png\")
<\/em><\/p>\nThis limits the download rate to 100 KB per second.<\/p>\n
5: Use a Proxy<\/strong><\/h3>\nIf, for some reason, you need to use a proxy, Curl can handle that too. Use the -x<\/strong> option followed by the proxy details.<\/p>\ncurl -x<\/span> http:\/\/<\/span>proxyserver:port http:\/\/<\/span>example.com<\/div><\/div>\n![](\"http:\/\/linuxways.net\/wp-content\/uploads\/2023\/06\/word-image-19666-7.png\")
<\/em><\/p>\n6: Measure Time Taken<\/strong><\/h3>\nWondering how long a request takes? Curl can give you this information with the -w<\/strong> option.<\/p>\ncurl -o<\/span> \/<\/span>dev\/<\/span>null -s<\/span> -w<\/span> 'Total time: %{time_total}s\\n'<\/span> http:\/\/<\/span>example.com<\/div><\/div>\n![](\"http:\/\/linuxways.net\/wp-content\/uploads\/2023\/06\/word-image-19666-8.png\")
<\/em><\/p>\nConclusion<\/strong><\/h2>\nCurl is a powerful tool for working with web data. With its abundance of options, the curl command offers versatility and can be used in numerous distinct ways. It\u2019s especially valuable for developers and system administrators for tasks like downloading files, interacting with APIs, and troubleshooting network issues.<\/p>","protected":false},"excerpt":{"rendered":"
A command-line utility that allows you to transfer data using various network protocols, with which you can interact with websites, APIs and even communicate with different devices on…<\/p>","protected":false},"author":110,"featured_media":19675,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1049],"tags":[],"class_list":["post-19666","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux-commands"],"_links":{"self":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts\/19666","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/users\/110"}],"replies":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/comments?post=19666"}],"version-history":[{"count":0,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts\/19666\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/media\/19675"}],"wp:attachment":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/media?parent=19666"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/categories?post=19666"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/tags?post=19666"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Installing Curl<\/strong><\/h2>\nNow that we understand what Curl is and why it’s an essential tool for handling web data, it’s time to get it installed on our Linux systems. Curl is widely supported and can be installed on various Linux distributions.<\/p>\n
On Debian-based Systems<\/strong><\/h3>\nIf you are operating on a Debian-based Linux distribution, like Ubuntu or Debian itself, the curl installation can be done using the apt-get<\/strong> command. Install curl by executing:<\/p>\nsudo<\/span> apt-get install<\/span> curl<\/div><\/div>\n<\/em><\/strong><\/p>\nOn Red Hat-based Systems<\/strong><\/h2>\nIn case you are using a Red Hat-based Linux distribution like CentOS or Fedora, the installation process is equally simple but uses a different package manager called yum<\/strong>. Install curl by executing:<\/p>\nsudo<\/span> yum install<\/span> curl<\/div><\/div>\nVerify Installation<\/strong><\/h3>\nIn both cases, after installation is complete, you can check the Curl version to confirm it was installed correctly. The code is:<\/p>\n
curl --version<\/span><\/div><\/div>\n<\/p>\n
Basic Curl Commands<\/strong><\/h2>\nAlright, let\u2019s now start with some of the basic commands that will get you up and running.<\/p>\n
1: Retrieve a Web Page<\/strong><\/h3>\nCurl’s most basic application is to fetch a web page. Instead of entering a website address into your browser, you can use Curl to directly retrieve the same page from your terminal. Here\u2019s how you do it:<\/p>\n
curl http:\/\/<\/span>example.com<\/div><\/div>\nThis will display the HTML content of the page in your terminal. If you just want to check if the page is accessible and don’t want to see all the HTML code, you can use the -I<\/strong> option to fetch just the headers.<\/p>\ncurl -I<\/span> http:\/\/<\/span>google.com<\/div><\/div>\n<\/em><\/strong><\/p>\n2: Download Files<\/strong><\/h3>\nYou can also use this command to download a file directly from the terminal. Use the -O<\/strong> option and specify the URL of the file.<\/p>\ncurl -O<\/span> http:\/\/<\/span>example.com\/<\/span>file.zip.<\/div><\/div>\n<\/em><\/p>\n3: Save Output to a File<\/strong><\/h3>\nWhen you use Curl to fetch a web page, it displays the content in the terminal. If you want to save this content to a file, use the -o<\/strong> option.<\/p>\ncurl -o<\/span> output.html http:\/\/<\/span>example.com<\/div><\/div>\n<\/em><\/p>\nThis command will save the HTML content of the web page to a file called output.html.<\/p>\n
4: Limit the Transfer Rate<\/strong><\/h3>\nThere may be situations where you don’t want Curl to use all your bandwidth. Maybe you are doing something else that’s more important. Use –limit-rate<\/strong> to limit the transfer rate.<\/p>\ncurl --limit-rate<\/span> 100K -O<\/span> http:\/\/<\/span>example.com\/<\/span>largefile.zip<\/div><\/div>\n<\/em><\/p>\nThis limits the download rate to 100 KB per second.<\/p>\n
5: Use a Proxy<\/strong><\/h3>\nIf, for some reason, you need to use a proxy, Curl can handle that too. Use the -x<\/strong> option followed by the proxy details.<\/p>\ncurl -x<\/span> http:\/\/<\/span>proxyserver:port http:\/\/<\/span>example.com<\/div><\/div>\n<\/em><\/p>\n6: Measure Time Taken<\/strong><\/h3>\nWondering how long a request takes? Curl can give you this information with the -w<\/strong> option.<\/p>\ncurl -o<\/span> \/<\/span>dev\/<\/span>null -s<\/span> -w<\/span> 'Total time: %{time_total}s\\n'<\/span> http:\/\/<\/span>example.com<\/div><\/div>\n<\/em><\/p>\nConclusion<\/strong><\/h2>\nCurl is a powerful tool for working with web data. With its abundance of options, the curl command offers versatility and can be used in numerous distinct ways. It\u2019s especially valuable for developers and system administrators for tasks like downloading files, interacting with APIs, and troubleshooting network issues.<\/p>","protected":false},"excerpt":{"rendered":"
A command-line utility that allows you to transfer data using various network protocols, with which you can interact with websites, APIs and even communicate with different devices on…<\/p>","protected":false},"author":110,"featured_media":19675,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1049],"tags":[],"class_list":["post-19666","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux-commands"],"_links":{"self":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts\/19666","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/users\/110"}],"replies":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/comments?post=19666"}],"version-history":[{"count":0,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts\/19666\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/media\/19675"}],"wp:attachment":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/media?parent=19666"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/categories?post=19666"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/tags?post=19666"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
If you are operating on a Debian-based Linux distribution, like Ubuntu or Debian itself, the curl installation can be done using the apt-get<\/strong> command. Install curl by executing:<\/p>\n In case you are using a Red Hat-based Linux distribution like CentOS or Fedora, the installation process is equally simple but uses a different package manager called yum<\/strong>. Install curl by executing:<\/p>\n In both cases, after installation is complete, you can check the Curl version to confirm it was installed correctly. The code is:<\/p>\n Alright, let\u2019s now start with some of the basic commands that will get you up and running.<\/p>\n Curl’s most basic application is to fetch a web page. Instead of entering a website address into your browser, you can use Curl to directly retrieve the same page from your terminal. Here\u2019s how you do it:<\/p>\n This will display the HTML content of the page in your terminal. If you just want to check if the page is accessible and don’t want to see all the HTML code, you can use the -I<\/strong> option to fetch just the headers.<\/p>\n You can also use this command to download a file directly from the terminal. Use the -O<\/strong> option and specify the URL of the file.<\/p>\n When you use Curl to fetch a web page, it displays the content in the terminal. If you want to save this content to a file, use the -o<\/strong> option.<\/p>\n This command will save the HTML content of the web page to a file called output.html.<\/p>\n There may be situations where you don’t want Curl to use all your bandwidth. Maybe you are doing something else that’s more important. Use –limit-rate<\/strong> to limit the transfer rate.<\/p>\n This limits the download rate to 100 KB per second.<\/p>\n If, for some reason, you need to use a proxy, Curl can handle that too. Use the -x<\/strong> option followed by the proxy details.<\/p>\n Wondering how long a request takes? Curl can give you this information with the -w<\/strong> option.<\/p>\n Curl is a powerful tool for working with web data. With its abundance of options, the curl command offers versatility and can be used in numerous distinct ways. It\u2019s especially valuable for developers and system administrators for tasks like downloading files, interacting with APIs, and troubleshooting network issues.<\/p>","protected":false},"excerpt":{"rendered":" A command-line utility that allows you to transfer data using various network protocols, with which you can interact with websites, APIs and even communicate with different devices on…<\/p>","protected":false},"author":110,"featured_media":19675,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1049],"tags":[],"class_list":["post-19666","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux-commands"],"_links":{"self":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts\/19666","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/users\/110"}],"replies":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/comments?post=19666"}],"version-history":[{"count":0,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/posts\/19666\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/media\/19675"}],"wp:attachment":[{"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/media?parent=19666"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/categories?post=19666"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/linuxways.net\/de\/wp-json\/wp\/v2\/tags?post=19666"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/em><\/strong><\/p>\nOn Red Hat-based Systems<\/strong><\/h2>\n
Verify Installation<\/strong><\/h3>\n
<\/p>\nBasic Curl Commands<\/strong><\/h2>\n
1: Retrieve a Web Page<\/strong><\/h3>\n
<\/em><\/strong><\/p>\n2: Download Files<\/strong><\/h3>\n
<\/em><\/p>\n3: Save Output to a File<\/strong><\/h3>\n
<\/em><\/p>\n4: Limit the Transfer Rate<\/strong><\/h3>\n
<\/em><\/p>\n5: Use a Proxy<\/strong><\/h3>\n
<\/em><\/p>\n6: Measure Time Taken<\/strong><\/h3>\n
<\/em><\/p>\nConclusion<\/strong><\/h2>\n