nsenter:tldr:c51ae

The nsenter command is used to run a command with a different Linux namespace. Namespaces provide isolation for various system resources such as processes, network interfaces, mount points, etc. By using nsenter, you can enter a specific namespace and execute a command within that namespace.

The command nsenter --target ${pid} --net ${command} ${command_arguments} has the following components:

• ${pid}: This is the Process ID (PID) of the target process whose namespace you want to enter. It specifies the namespace to be targeted.
• --target: This option is used to specify that we want to enter the namespace of a particular target process identified by its PID.
• --net: This option indicates that we want to enter the network namespace specifically. With --net, we enter the network namespace of the target process.
• ${command}: The command you want to execute within the specified namespace. It can be any valid command or executable.
• ${command_arguments}: The arguments or options that need to be passed to the ${command} while executing it within the specified namespace.

Overall, the given command instructs nsenter to enter the network namespace of the process identified by ${pid} and then execute ${command} with the specified ${command_arguments} within that network namespace.