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SHAREOLITE

Linux curl command syntax and practical examples

In this post , we will learn how to use one of the most powerful commands of Linux , curl which may be used to query web servers and API specific applications. Here are few practical examples of curl command

Use case 1 : To perform a GET request for a web or API URL 

Syntax :  curl --get "End point URL"

Example : curl --get "https://shareolite.com/feeds/poster/default?alt=json&type=1&filter=latest"

Use case 2 : To perform a POST request for a web or API URL 

Syntax :  curl "End point URL"

Example : curl "https://shareolite.com/feeds/poster/default?alt=json&type=1&filter=latest"

Linux curl command syntax and practical examples

Use case 3 : POST data to a Web server or API URL

Syntax : curl --data "data to be posted" URL

Example :  curl --data "client_id=1&client_name=shareolite" "https://shareolite.com/api"

Use case 4 : POST JSON data to a Web server with body content in a file

Syntax :  curl -H "Content-Type: application/json" --data @filename URL

Example : curl -H "Content-Type: application/json" --data @body.json http://10.20.30.40/api/feed

In the body.json file above , copy the JSON content

Use case 5 : POST data with Basic Authentication

Syntax : curl --data "data to be posted" --user name:password URL

Example :  curl --data "client_id=1&client_name=shareolite" --user "testuser:testpassword" "https://shareolite.com/api"

Use case 6 : Print header information also using option -v

Syntax :  curl -H "Content-Type: application/json" --data @filename URL -v

Example : curl -H "Content-Type: application/json" --data @body.json http://10.20.30.40/api/feed -v

In the body.json file above , copy the JSON content

Use case 7 : Set Time out for connection request using --connect-timeout

Syntax : curl --connect-timeout (value in seconds) URL

Example :  

curl --connect-timeout 20 https://shareolite.com      ( 20 seconds )
curl --connect-timeout 3.14 https://shareolite.com   ( 3.14 seconds )
 

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