stun:tldr:b9ba1
stun: Make a STUN request.
$ stun ${stun-1und1-de}
try on your machine
This command seems to be using a variable called "stun-1und1-de" and passing its value as an argument to the "stun" command.
The exact purpose or functionality of the "stun" command is unclear without further context. It could refer to a specific command-line executable or a function defined in a script.
The "${stun-1und1-de}" syntax is known as parameter expansion or substitution in shell scripting. It allows you to use the value of a variable or a default value if the variable is not set or empty. In this case, it suggests that the value of the "stun-1und1-de" variable is expected to be provided or already set for proper execution of the "stun" command.
This explanation was created by an AI. In most cases those are correct. But please always be careful and
never run a command you are not sure if it is safe.