curl command HowTo - Linux / Unix Q & A from nixCraft

Curl Set User Agent Command on Linux or Unix

last updated May 8, 2018 in Linux, UNIX

I need to set the user agent header for curl command. How can I set or change user agent with curl command on Linux or Unix like system?

How to redirect Nginx non-www to www domain over SSL

last updated April 24, 2018 in Linux, Nginx, Troubleshooting, UNIX

I am getting an error that reads, “Your connection is not secure” when trying to redirect https://theos.in/ to https://www.theos.in/ domain using HTTP 301. How do I redirect Nginx non-www to www domain over SSL?

How to install curl command on a Ubuntu Linux

last updated October 20, 2017 in Linux, Package Management, Ubuntu Linux

I am a new Ubuntu Linux user. I switched from Apple MacOS/Macbook and I trying to run the curl command from a shell script but getting the following error:
bash: curl: command not found
How do I fix this on a Ubuntu Linux version 17.10/16.04 LTS?

How to use the cURL command to do a POST data to fields on Linux or Unix

last updated May 28, 2017 in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, Linux, RedHat and Friends, Suse, UNIX

How do I use the cURL command on Linux or Unix to post data i.e. upload something on Linux or Unix? How do I make a POST request with the cURL Linux command-line to upload file?

How to ignore invalid and self singed ssl connection errors with curl command

last updated January 24, 2017 in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, Linux, RedHat and Friends, Suse, UNIX

I wanted to curl command to ignore SSL certification warning. Does curl command have a --no-check-certificate option like wget command on Linux or Unix-like system?

How to use curl command with http/2 on MacOS X

last updated November 1, 2016 in BASH Shell, Mac OS X, Package Management, Troubleshooting, UNIX

I am using a MacOS sierra (version 10.12.1). How do I use curl command with http2/ protocol? I am getting an error that read as follows:

How to use curl command with proxy username/password on Linux/ Unix

last updated December 26, 2017 in BASH Shell, FreeBSD, Linux, Mac OS X, UNIX

My sysadmin provided me the following proxy details:
       IP: 202.54.1.1
       Port: 3128
       Username: foo
       Password: bar
The settings worked perfectly with Google Chrome and Firefox browser. How do I use it with the curl command? How do I tell the curl command to use my proxy settings from Google Chrome browser?