On some systems, using Ctrl-C to kill the currently running process will also kill sub-processes, even if they've been started with nohup.
To remedy this, the subprocesses need to be started using setsid as follows:
setsid nohup COMMAND &
setsid runs its first argument (nohup) with a new Process Group ID, thus stopping Ctrl-C from killing it.
nohup runs its first argument (COMMAND) such that it will ignore hangup signals (SIGHUP).
& runs setsid in the background.
This command can be used on the command line or inside a shell script.