04-07-2010
@jgt
The script you post is terrifying, but I follow the basic reasoning. I would recommend that nobody runs that script on an operational system - especially one which has data.
Sorry, but it is scripts such as this which issue "kill -9" arbitarily actually cause the situation which we see with "who -d" in the original post.
If you were forced to issue a kill against orphan interractive process it should be "kill -15" or whatever "kill" signal is required by the application.
Never issue "kill -9" unless you are having trouble shutting a system down or encounter a process which is definitely stuck on impossible I/O.
Last edited by methyl; 04-07-2010 at 09:06 PM..
Reason: typo
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LEARN ABOUT OPENDARWIN
kill
KILL(1) BSD General Commands Manual KILL(1)
NAME
kill -- terminate or signal a process
SYNOPSIS
kill [-s signal_name] pid ...
kill -l [exit_status]
kill -signal_name pid ...
kill -signal_number pid ...
DESCRIPTION
The kill utility sends a signal to the processes specified by the pid operand(s).
Only the super-user may send signals to other users' processes.
The options are as follows:
-s signal_name
A symbolic signal name specifying the signal to be sent instead of the default TERM.
-l [exit_status]
If no operand is given, list the signal names; otherwise, write the signal name corresponding to exit_status.
-signal_name
A symbolic signal name specifying the signal to be sent instead of the default TERM.
-signal_number
A non-negative decimal integer, specifying the signal to be sent instead of the default TERM.
The following pids have special meanings:
-1 If superuser, broadcast the signal to all processes; otherwise broadcast to all processes belonging to the user.
Some of the more commonly used signals:
1 HUP (hang up)
2 INT (interrupt)
3 QUIT (quit)
6 ABRT (abort)
9 KILL (non-catchable, non-ignorable kill)
14 ALRM (alarm clock)
15 TERM (software termination signal)
Some shells may provide a builtin kill command which is similar or identical to this utility. Consult the builtin(1) manual page.
SEE ALSO
builtin(1), csh(1), killall(1), ps(1), kill(2), sigaction(2)
STANDARDS
The kill function is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.
HISTORY
A kill command appeared in Version 6 AT&T UNIX.
BUGS
A replacement for the command ``kill 0'' for csh(1) users should be provided.
BSD
April 28, 1995 BSD