Curl in Bash Scripts by Example

1. What is curl in bash script?
2. How do I run a curl script in bash?
3. How do you curl a script?
4. How do I curl a variable in bash?
5. How do you automate cURL commands?
6. How do I run a cURL script in Linux?
7. How do you use the variable in curl command?
8. How do I run multiple curl commands in shell script?
9. How do I use curl call REST API?
10. Why do we use curl?
11. What is curl in math?
12. How do I follow curl redirect?

What is curl in bash script?

curl is a command line tool to transfer data to or from a server, using any of the supported protocols (HTTP, FTP, IMAP, POP3, SCP, SFTP, SMTP, TFTP, TELNET, LDAP or FILE). curl is powered by Libcurl. This tool is preferred for automation, since it is designed to work without user interaction.

How do I run a curl script in bash?

In bash, we curl to download a file as follows.

1. curl $url # download file.
2. curl $url > outfile. # download file saving as outfile. ...
3. curl -I $url # download headers.
4. curl -u -H --data $url # send crafted request.
5. #!/bin/bash. ## curl-basic-auth-config. ...
6. bash bash-curl-basic-auth-example.sh URL. ...
7. curl \ ...
8. ## method (1)

How do you curl a script?

The syntax for the curl command is as follows: curl [options] [URL...] In its simplest form, when invoked without any option, curl displays the specified resource to the standard output. The command will print the source code of the example.com homepage in your terminal window.

How do I curl a variable in bash?

Place them inside double-quotes instead: curl -u <my-api-token>: \ -X POST https://api.pushbullet.com/v2/pushes \ --header 'Content-Type: application/json' \ --data-binary '"type": "note", "title": "'"$TR_TORRENT_NAME"'", \ "body": "'"$TR_TORRENT_NAME completed"'."'

How do you automate cURL commands?

Script to automate different REST API CURL commands asynchronously

1. POST on REST API with JSON input.
2. Extract 'ID1' from Response Data and pass it to next GET call.
3. Extract another 'ID2' from the above GET call and pass it to next GET call.
4. Extract 'Elapsed Time' from next GET call.

How do I run a cURL script in Linux?

15 Tips On How to Use 'Curl' Command in Linux

1. Download a File. If you want to download a file, you can use curl with the -O or -o options. ...
2. Download Multiple Files. With the following command you will download info. ...
3. Use a Proxy with or without Authentication. If you are behind a proxy server listening on port 8080 at proxy.yourdomain.com, do. ...
4. Specify User Agent.

How do you use the variable in curl command?

Three ways to pass the environment variables

1. 1 Add a single quote and a double quote around the variable. $ curl -X POST https://requestbin.io/1bk0un41 -H "Content-Type: application/json" -d ' "property1":"'"$TERM"'", "property2":"value2" ' ...
2. 2 Escaping double quote. ...
3. 3 Use a data generation function.

How do I run multiple curl commands in shell script?

7 Answers

1. make a file called curlrequests.sh.
2. save the file and make it executable with chmod : chmod +x curlrequests.sh.
3. run your file: ./curlrequests.sh.

How do I use curl call REST API?

The syntax for the curl command is as follows: curl [options] [URL...]
...
Here are the options that we'll use when making requests:

1. -X , --request - The HTTP method to be used.
2. -i , --include - Include the response headers.
3. -d , --data - The data to be sent.
4. -H , --header - Additional header to be sent.

Why do we use curl?

curl is a widely used because of its ability to be flexible and complete complex tasks. For example, you can use curl for things like user authentication, HTTP post, SSL connections, proxy support, FTP uploads, and more! You can also do simple things with curl, such as download web pages and web images.

What is curl in math?

In vector calculus, the curl is a vector operator that describes the infinitesimal circulation of a vector field in three-dimensional Euclidean space. ... The curl of a field is formally defined as the circulation density at each point of the field. A vector field whose curl is zero is called irrotational.

How do I follow curl redirect?

In curl's tradition of only doing the basics unless you tell it differently, it does not follow HTTP redirects by default. Use the -L, --location to tell it to do that. When following redirects is enabled, curl will follow up to 50 redirects by default.