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Full Discussion: Kill command
Top Forums UNIX for Dummies Questions & Answers Kill command Post 302894199 by rbatte1 on Monday 24th of March 2014 10:39:29 AM
Old 03-24-2014
A very harsh way to learn is the difference between kill %1 and kill 1

This should be fine:-
Code:
# sleep 100 &
[1]     5638
# jobs
[1] +  Running                 sleep 100 &
# ps -f
     UID   PID    PPID  C    STIME TTY       TIME COMMAND
    root 17654   17653  0 13:33:49 pts/tv    0:00 -ksh
    root 5638    17654  0 14:28:48 pts/tv    0:00 sleep 100
    root 5840    17654  1 14:29:27 pts/tv    0:00 ps -f
    root 17653   986    0 13:33:49 pts/tv    0:00 telnetd -b /etc/herald
# kill %1
[1] + Terminated               sleep 100 &
#

I need to make this next bit clear:-
Do not run this!
Code:
# sleep 100 &
[1]     5638
# jobs
[1] +  Running                 sleep 100 &
# ps -f
     UID   PID    PPID  C    STIME TTY       TIME COMMAND
    root 17654   17653  0 13:33:49 pts/tv    0:00 -ksh
    root 5638    17654  0 14:28:48 pts/tv    0:00 sleep 100
    root 5840    17654  1 14:29:27 pts/tv    0:00 ps -f
    root 17653   986    0 13:33:49 pts/tv    0:00 telnetd -b /etc/herald
# kill 1
.
.
.

.... or your server with fail in the instant. Not even a crash in most cases, it just fails.

Even process 5 may be very early and a very critical process. You may be lucky and process 5 may have already terminated, but it's very risky stuff all the same. If you are the root user, you can terminate any process, so single digit errors on a kill command can be catastrophic. Imagine terminating an application serving process, a database query or worse a critical database service sudo as pmon for Oracle or oinit for Informix etc.


With great power comes great responsibility and errors can cause irrevocable damage.


Robin
 

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KILL(1) 						      General Commands Manual							   KILL(1)

NAME
kill, broke - print commands to kill processes SYNOPSIS
kill name broke DESCRIPTION
Kill prints commands that will cause all processes called name and owned by the current user to be terminated. Use the send command of 81/2(1), or pipe the output of kill into rc(1) to execute the commands. Kill suggests sending a kill note to the process; the same message delivered to the process's ctl file (see proc(3)) is a surer, if heavy handed, kill, but is necessary if the offending process is ignoring notes. Broke prints commands that will cause all processes in the Broken state and owned by the current user to go away. When a process dies because of an error caught by the system, it may linger in the Broken state to allow examination with a debugger. Executing the commands printed by broke lets the system reclaim the resources used by the broken processes. SOURCE
/rc/bin/kill /rc/bin/broke SEE ALSO
ps(1), stop(1), proc(3) KILL(1)
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