An administrator needs to change the IP address on a server remotely. After updating the configuration files, a network restart is needed. However, the administrator fears that when the network…

The `nohup` command runs a command immune to hangups, meaning it prevents the process from receiving the SIGHUP signal which is typically sent to processes when the controlling terminal is closed or a network connection drops, ensuring the network restart script completes.

Appending `&` to a command runs it in the background, but the process can still receive a SIGHUP signal and be terminated if the terminal session ends.

`at now` schedules a command to run immediately in a new shell environment, which might survive a session drop, but `nohup` is specifically designed to make a process immune to hangups from terminal closure or network loss.

`dg` is not a standard Linux command for preventing scripts from being killed upon session termination.