hup - execute command pending hang-up signal
hup [command]
This command is a C-shell built-in command.
With command, hup(1) runs command so that it will exit on a hang-up signal and arranges for the shell to send it a hang-up signal when the shell exits. Note, however, that commands can set their own response to hangups, overriding hup. Without an argument (allowed only in a shell script), hup(1) causes the shell to exit on a hangup for the remainder of the script. (See also Signal Handling in tcsh(1) and the nohup(1) built-in command.)