10-07-2008
When you disconnect from a terminal - like turn off the modem, click the 'x', or otherwise tell the terminal you are using to close - this sends a signal to every process that is part of that terminals' "family" of processes. The signal is SIGHUP. Short for hangup.
When a process gets a SIGHUP signal it exits. nohup blocks the signal and the process created by nohup keeps on running - so "no hup" signal gets thru. ...sorry but that is where it comes from.
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killall(1M) killall(1M)
NAME
killall - kill all active processes
SYNOPSIS
[signal]
DESCRIPTION
is a procedure used by to kill all active processes not directly related to the shutdown procedure.
is chiefly used to terminate all processes with open files so that the mounted file systems are no longer busy and can be unmounted. sends
the specified signal to all user processes in the system, with the following exceptions:
the process;
all processes (including background processes) associated with the terminal from which was invoked;
any process, if owned by
any process, if owned by
any process;
any process;
any process.
obtains its process information from and therefore may not be able to perfectly identify which processes to signal (see ps(1)).
If no signal is specified, a default of (kill) is used.
is invoked automatically by The use of is recommended over using by itself (see shutdown(1M)).
FILES
SEE ALSO
fuser(1M), kill(1), ps(1), shutdown(1M), signal(5).
STANDARDS CONFORMANCE
killall(1M)