What does scheme missing mean in Linux?
Yes, the double quoting is the problem. Remove the ' ones and it should work. The error message means that wget gets the argument 'http://foo/get_file.php?file_name=bar_100.zip' - scheme missing means that it expects the argument to be http/ftp/https and so on, and 'https in no scheme.
How do I run a wget command in Linux?
Most Linux distributions have Wget installed by default. To check, type wget in your terminal and press ENTER . If it is not installed, it will display: command not found . You can install it by running the following command: sudo apt-get install wget .