dnstracer:tldr:cb246

The command "dnstracer -4 ${www-example-com}" is used to trace the DNS (Domain Name System) delegation path for a specific domain name.

Here's a breakdown of each component:

• "dnstracer" is the name of the command or program that is being executed.
• "-4" is a command line option that specifies to use IPv4 addresses for the trace. This means that the command will only use IPv4 for DNS resolution and not IPv6.
• "${www-example-com}" is the domain name for which you want to trace the DNS delegation path. The domain name in this case is "www.example.com", but the "${}" syntax is commonly used to define variables in command line scripts or shells. So, if you see this command in a script or within a shell, it likely means that the domain name is stored in a variable named "www-example-com".

To summarize, this command will use the dnstracer program to trace the DNS delegation path for the domain specified in the variable "www-example-com" using IPv4 addresses only.