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Full Discussion: Kill users
Top Forums Shell Programming and Scripting Kill users Post 55531 by Perderabo on Tuesday 14th of September 2004 08:23:10 AM
Old 09-14-2004
First, you can become "samuel":
su samuel

Be very sure that this worked:
id

Kill all processes owned by the current user:
/usr/bin/kill -9 -1

A pid of -1 is special, it is a wildcard pid. Some shells have a kill built-in command that doesn't understand this. That's why you might need the real kill command.

However, you should not use kill -9 except as a last resort. A process cannot catch or ignore -9, that's why newbie admins love it. The process almost always dies with a -9. But most processes behave well with signals. Only a few processes are broken. And processes may have allocated resources that they will free upon their death. But that can't happen if they are killed with a -9.

So try a:
/usr/bin/kill -1 -1
first. And wait a few seconds. Anything left was probably nohup'ed. It may be important and you may want to contact the user before proceeding. Then do:
/usr/bin/kill -15 -1
which should kill a nohup'ed process.

If it survives a -15, you will need to try the -9. But that should happen only rarely.
 

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LEARN ABOUT OSX

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
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