You can set the User-Agent header in a cURL request on Linux or Unix using the -H option. The User-Agent header is used by the server to identify the client software and version. Here is an example of how to set the User-Agent header in a cURL request:
curl -H "User-Agent: MyClient/1.0" https://www.example.com
In this example, the User-Agent header is set to “MyClient/1.0”. You can replace this with any string that you like to identify your client software and version.
Note that some websites may block or limit access based on the User-Agent header, so it’s always a good idea to set a meaningful and accurate User-Agent header to ensure that your cURL requests are not mistaken for automated or malicious requests.