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Full Discussion: How to add conditional check of whether a process is running before doing rest of script?
Top Forums Shell Programming and Scripting How to add conditional check of whether a process is running before doing rest of script? Post 302854087 by nbsparks on Monday 16th of September 2013 05:38:09 PM
Old 09-16-2013
OK... So I've never done anything like that before...

Here's the script I have that I want to modify.
Code:
#!/bin/bash

echo Overviewer Starting... >>/home/mcmaps/scripts/overviewer.log
date >>/home/mcmaps/scripts/overviewer.log
echo ------------------------- >>/home/mcmaps/scripts/overviewer.log
overviewer.py --verbose --quiet --processes 1 --config=/home/mcmaps/servers/bukkitpvt/overviewer.conf >>/home/mcmaps/scripts/overviewer.log
echo ------------------------- >>/home/mcmaps/scripts/overviewer.log
echo Overviewer Complete >>/home/mcmaps/scripts/overviewer.log
echo ============================================ >>/home/mcmaps/scripts/overviewer.log

An example of the log it creates:
Code:
============================================
Overviewer Starting...
Mon Sep 16 13:57:52 PDT 2013
-------------------------
overviewer.py:290  12313 2013-09-16 13:57:52 INFO     Welcome to Minecraft Overviewer!
observer.py:105    12313 2013-09-16 13:59:37 INFO     Rendered 0 of 0.  100% complete
observer.py:97     12313 2013-09-16 13:59:37 INFO     Rendered 0 of 0.  100% complete
-------------------------
Overviewer Complete
============================================
Overviewer Starting...
Mon Sep 16 14:10:45 PDT 2013
-------------------------
overviewer.py:290  13681 2013-09-16 14:10:45 INFO     Welcome to Minecraft Overviewer!
observer.py:105    13681 2013-09-16 14:12:31 INFO     Rendered 0 of 1808.  0% complete
observer.py:105    13681 2013-09-16 14:12:33 INFO     Rendered 11 of 1808.  0% complete
observer.py:105    13681 2013-09-16 14:12:35 INFO     Rendered 22 of 1808.  1% complete
observer.py:105    13681 2013-09-16 14:12:36 INFO     Rendered 33 of 1808.  1% complete
observer.py:105    13681 2013-09-16 14:12:37 INFO     Rendered 44 of 1808.  2% complete
observer.py:105    13681 2013-09-16 14:12:38 INFO     Rendered 55 of 1808.  3% complete
observer.py:105    13681 2013-09-16 14:12:39 INFO     Rendered 66 of 1808.  3% complete
observer.py:105    13681 2013-09-16 14:12:40 INFO     Rendered 77 of 1808.  4% complete
observer.py:105    13681 2013-09-16 14:12:42 INFO     Rendered 88 of 1808.  4% complete
observer.py:105    13681 2013-09-16 14:12:43 INFO     Rendered 99 of 1808.  5% complete
observer.py:105    13681 2013-09-16 14:12:48 INFO     Rendered 150 of 1808.  8% complete
observer.py:105    13681 2013-09-16 14:12:57 INFO     Rendered 201 of 1808.  11% complete
observer.py:105    13681 2013-09-16 14:13:08 INFO     Rendered 252 of 1808.  13% complete
observer.py:105    13681 2013-09-16 14:13:17 INFO     Rendered 303 of 1808.  16% complete
observer.py:105    13681 2013-09-16 14:13:27 INFO     Rendered 354 of 1808.  19% complete
observer.py:105    13681 2013-09-16 14:13:40 INFO     Rendered 405 of 1808.  22% complete
observer.py:105    13681 2013-09-16 14:13:49 INFO     Rendered 456 of 1808.  25% complete
observer.py:105    13681 2013-09-16 14:14:07 INFO     Rendered 557 of 1808.  30% complete
observer.py:105    13681 2013-09-16 14:14:26 INFO     Rendered 658 of 1808.  36% complete
observer.py:105    13681 2013-09-16 14:14:45 INFO     Rendered 759 of 1808.  41% complete
observer.py:105    13681 2013-09-16 14:15:07 INFO     Rendered 860 of 1808.  47% complete
observer.py:105    13681 2013-09-16 14:15:24 INFO     Rendered 961 of 1808.  53% complete
observer.py:105    13681 2013-09-16 14:15:43 INFO     Rendered 1062 of 1808.  58% complete
observer.py:105    13681 2013-09-16 14:16:05 INFO     Rendered 1163 of 1808.  64% complete
observer.py:105    13681 2013-09-16 14:16:24 INFO     Rendered 1264 of 1808.  69% complete
observer.py:105    13681 2013-09-16 14:16:43 INFO     Rendered 1365 of 1808.  75% complete
observer.py:105    13681 2013-09-16 14:17:04 INFO     Rendered 1466 of 1808.  81% complete
observer.py:105    13681 2013-09-16 14:17:33 INFO     Rendered 1567 of 1808.  86% complete
observer.py:105    13681 2013-09-16 14:17:59 INFO     Rendered 1668 of 1808.  92% complete
observer.py:105    13681 2013-09-16 14:18:21 INFO     Rendered 1769 of 1808.  97% complete
observer.py:97     13681 2013-09-16 14:18:28 INFO     Rendered 1808 of 1808.  100% complete
-------------------------
Overviewer Complete
============================================

What I see if I run it again and then view "top" in another terminal session.
Code:
  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND
15228 mcmaps    20   0  115m  33m 5080 R 100.1  0.9   0:06.94 overviewer.py

But the PID changes each time I run the script. So how would I know what to store (PID wise) in "/var/run/processname.pid" and how would I know what to look for?

Totally lost. Sorry. :-(
 

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