I have a java runnable jar which I need to run it if it not running or got killed for some reason so I decided to use crontab for this - 

I need to run the crontab as "poppetapp" user so I am logged in as this user and created crontab like this - 

```
*/5 * * * * pgrep -f test_java_10.jar || cd /home/poppetapp && /home/poppetapp/test_java.sh > /home/poppetapp/test_java.out

```

And my shell script is like this which is in `/home/poppetapp/` location - 

```
#!/bin/sh
/usr/home/java -jar /home/poppetapp/test_java_10.jar

```

My java runnable jar is in the home location for "poppetapp" user which is `/home/poppetapp/`.

So my question is - Does this look right? I just need to start my `test_java_10.jar` if it is not running or got killed for some reason so I created a crontab which will run every 5 minutes to check whether it is running or not. If it is not running it will execute my shell script to start the `test_java_10.jar` process.

But somehow when I make this crontab change, I am seeing lot of `test_java_10.jar` process is getting invoked. I think every 5 minutes it is launching another process for this.

**UPDATE:-**

If I modify my crontab like this - 

```
*/5 * * * * pgrep -f test_java_10.jar || /home/poppetapp/test_java.sh > /home/poppetapp/test_java.out

```

then I see below mail which doesn't say what's the problem or does it say anything?

```
& t 35
Message 35:
From poppetapp@machineA  Tue Mar 24 17:05:01 2015
X-Original-To: poppetapp
From: root@machineA (Cron Daemon)
To: poppetapp@machineA
Subject: Cron <poppetapp@machineA> pgrep -f test_java_10.jar || /home/poppetapp/test_java.sh > /home/poppetapp/test_java.out
Content-Type: text/plain; charset=ANSI_X3.4-1968
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <HOME=/home/poppetapp>
X-Cron-Env: <PATH=/usr/bin:/bin>
X-Cron-Env: <LOGNAME=poppetapp>
Date: Tue, 24 Mar 2015 17:05:01 -0700 (GMT+7)

```