Top Forums Shell Programming and Scripting Finding the age of a unix process, killing old processes, killing zombie processes Post 302412948 by sukerman on Wednesday 14th of April 2010 04:48:15 AM
Finding the age of a unix process, killing old processes, killing zombie processes

I had issues with processes locking up. This script checks for processes and kills them if they are older than a certain time.

Its uses some functions you'll need to define or remove, like slog() which I use for logging, and is_running() which checks if this script is already running so you can add it to cron without running multiple copies.

Hope this helps someone ;-)


    if (is_running()) die();

    slog("monitor started",2);

        check_process("convert"); // kill convert processes over 5 minutes old (default)
        check_process("bash",1440); // kill bash processes over 1440 minutes old
        check_process("qmail-smtpd",30); // kill qmail-smtpd processes over 30 minutes old

    function cmd($cmd){
        $fp = popen($cmd, 'r');
        while ($read = fread($fp, 2096)) $ret = $ret.$read;
        return $ret;
    function kill_pid($pid){
        slog("kill_pid: killing [$pid]",2);
    function check_process($cmd,$max_runtime=5) {
        $now = getdate();
        $h = $now['hours'];
        $m = $now['minutes'];
        $nowtime = ($h*3600)+($m*60);
        $x = cmd("ps h -fC $cmd");
        if ($x){
            $x = explode("\n",$x);
            foreach($x as $l){
                if ($l){
                    while (strstr($l,"  ")) $l = str_replace("  "," ",$l);
                    list($owner,$pid,$ppid,$c,$stime,$tty,$s,$time,$cmd) = explode(" ",$l);
                    if (!strstr($stime,":")) {
                        slog("check_process: $cmd : STIME [$stime] - more than a day old",2);
                    } else {
                        slog("check_process: $cmd : check runtime");
                        list($sh,$sm) = explode(":",$stime);
                        $runtime = ($sh*3600)+($sm*60);
                        $diff = ($nowtime - $runtime)/60;
                        if ($diff>$max_runtime){
                            slog("check_process: $cmd : STIME [$stime] now [$h:$m] - over $max_runtime minutes since start",2);
                        } else slog("check_process: $cmd : STIME [$stime] now [$h:$m] - running $diff/$max_runtime minutes",2);
        } else slog("check_process: $cmd : no processes",2);

Last edited by sukerman; 04-14-2010 at 06:10 AM.. Reason: Added script shebang incase you didn't realise its php
Test Your Knowledge in Computers #774
Difficulty: Medium
The finite state machine has more computational power than a Turing machine.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Killing idle user processes

I'm looking for some help, please! I'm trying to kill any idle user processes over 40 Minutes. I have tried putting TMOUT=2400 within the users .profile However this does not seem to be working. We run aix 4.3.3 with ORACLE 7.3 The above works o.k. when the user is only within the... (3 Replies)
Discussion started by: annette
3 Replies

2. Shell Programming and Scripting

Killing processes in scripts

I have a small problem. It's annoying though. I wrote this shell script: # # This script will accept two arguments. The first is a flag and the # second is a time interval. The only valid flag is '-t' which means # the user will specify the interval in seconds, otherwise the # default is 600... (3 Replies)
Discussion started by: el_toro
3 Replies

3. Solaris

killing all processes for an user

how can I kill all the processes belonging to an user. I need it because I can't see a process initiated by a user and thus unable to kill it. (2 Replies)
Discussion started by: krishan
2 Replies

4. UNIX for Dummies Questions & Answers

forking and killing parent processes

Hi everybody, I'm having some problems wiriting a program in UNIX using the "fork" and "kill" system calls. I have to create a C program P0, which creates 9 other processes P1, P2, ..., P9, where P0 is the father of P1, P1 the father of P2, and so on. All the processes contain an infinite... (0 Replies)
Discussion started by: davewilliams20
0 Replies

5. Shell Programming and Scripting

killing cascade processes

Hi everybody!! I've got a problem. I have a loop like this: while true; do some_work sleep 10m done It's possible to kill the main loop process and kill all childs from it? I want to kill main process and kill the sleep also. I tried kill -9 <loop_pid> with no result ... (4 Replies)
Discussion started by: victorin
4 Replies

6. UNIX for Advanced & Expert Users

Monitoring Processes - Killing hung processes

Is there a way to monitor certain processes and if they hang too long to kill them, but certain scripts which are expected to take a long time to let them go? Thank you Richard (4 Replies)
Discussion started by: ukndoit
4 Replies

7. UNIX for Advanced & Expert Users

killing all child processes

Hi, Is there a way I can kill all the child processes of a process, given its process id. Many thanks in advance. J. (1 Reply)
Discussion started by: superuser84
1 Replies

8. HP-UX

OSF/1 swap file low and killing processes!

Hi, Hoping someone may be able to help with some general guidance. Hope I've posted this in the right forum! I hava DEC Workstation running OSF/1. It's will run for a period of time then slow down to the point it becomes unusable. Then i have to reboot and the whole thing repeats. I... (1 Reply)
Discussion started by: emeak
1 Replies

9. Solaris

Killing a zombie process[PRD]

Dear All, I have checked so many post about killing Zombie process. Most of the cases, everyone suggested to "reboot" the system, as "kill -9/-15 zombie" may not work! My concern is: If the system is a Production server then what to do? Regards, Sapy. (6 Replies)
Discussion started by: saps19
6 Replies

10. Shell Programming and Scripting

killing serious of processes in the server

i am new to unix..i have requirement to kill informatica server process. when i used the below query pidoff "pmserver" it displayed 3 process running.. i need to get the 3 process and kill individual process in shell script. Can you please assit me in this. (2 Replies)
Discussion started by: hkoshekay
2 Replies
KILLALL(1)							   User Commands							KILLALL(1)

killall - kill processes by name SYNOPSIS
killall [-e,--exact] [-g,--process-group] [-i,--interactive] [-q,--quiet] [-v,--verbose] [-w,--wait] [-V,--version] [-S,--sid] [-c,--con- text] [-s,--signal signal] [--] name ... killall -l killall -V,--version DESCRIPTION
killall sends a signal to all processes running any of the specified commands. If no signal name is specified, SIGTERM is sent. Signals can be specified either by name (e.g. -HUP) or by number (e.g. -1). If the command name contains a slash (/), processes executing that particular file will be selected for killing, independent of their name. killall returns a zero return code if at least one process has been killed for each ilisted command. killall returns zero otherwise. A killall process never kills itself (but may kill other killall processes). OPTIONS
-e, --exact Require an exact match for very long names. If a command name is longer than 15 characters, the full name may be unavailable (i.e. it is swapped out). In this case, killall will kill everything that matches within the first 15 characters. With -e, such entries are skipped. killall prints a message for each skipped entry if -v is specified in addition to -e, -g, --process-group Kill the process group to which the process belongs. The kill signal is only sent once per group, even if multiple processes belong- ing to the same process group were found. -i, --interactive Interactively ask for confirmation before killing. -l, --list List all known signal names. -q, --quiet Do not complain if no processes were killed. -v, --verbose Report if the signal was successfully sent. -V, --version Display version information. -w, --wait Wait for all killed processes to die. killall checks once per second if any of the killed processes still exist and only returns if none are left. Note that killall may wait forever if the signal was ignored, had no effect, or if the process stays in zombie state. -S (Flask only) Specify SID: kill only processes with given SID. Mutually exclusive with -c argument. Must precede other arguments on command line. -c (Flask only) Specify security context: kill only processes with given security context. Mutually exclusive with -s. Must precede other arguments on the command line. FILES
/proc location of the proc file system KNOWN BUGS
Killing by file only works for executables that are kept open during execution, i.e. impure executables can't be killed this way. Be warned that typing killall name may not have the desired effect on non-Linux systems, especially when done by a privileged user. killall -w doesn't detect if a process disappears and is replaced by a new process with the same PID between scans. AUTHORS
Werner Almesberger <> wrote the original version of psmisc. Since version 20 Craig Small <csmall@small.drop-> can be blamed. SEE ALSO
kill(1), fuser(1), pgrep(1), pidof(1), ps(1), kill(2) Linux March 25, 2001 KILLALL(1)

Featured Tech Videos

All times are GMT -4. The time now is 08:18 AM.
Unix & Linux Forums Content Copyright 1993-2020. All Rights Reserved.
Privacy Policy