Solved

finding java process id using perl on Linux

Posted on 2007-11-18
4
2,125 Views
Last Modified: 2008-02-01
Whats the best way to find a java process for a particular user so that a system call for sighup can be issued? Basically I need to find the PID for several reasons - but the main one is it kill the jvm process from a tomcat installation. (There are more than one jvm running and  by having the user information I should be able to pull their active JAVA PID)

ps -u username | grep java works for bash.

In perl i tried:
system "ps -u username | grep java > tempPID.txt";

then i was going to access the file and pull the PID but I couldn't get the system call to work.

Any suggestions?

Thanks!
0
Comment
Question by:kipper3d
  • 2
4 Comments
 
LVL 48

Accepted Solution

by:
Tintin earned 125 total points
ID: 20309895
Assuming your system has pgrep (most Unix/Linux systems do)

my $pid=`pgrep -U username java` or die "Can not run pgrep $!\n";
0
 
LVL 1

Author Comment

by:kipper3d
ID: 20310271
Wow! I had no idea there was such a thing. Beautiful. Thank you!
0
 
LVL 9

Expert Comment

by:Suhas .
ID: 20310287
on windows machine:

use module Win32::Process

1. $ProcessObj->GetProcessID()
2. Win32::Process::KillProcess($pid, $exitcode)
0
 
LVL 1

Author Comment

by:kipper3d
ID: 22003837
ok I tried this - finally.

The result:
5917 <- prints from Line 1
0 <- what is actually in $pid variable.

I need to carry the value 5917 in $pid to issue a kill statement but System returns 0
The statement above returns only a string.


my $pid = system("pgrep -U $user java");
 
print $pid;

Open in new window

0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Removing file extension within a file. 4 94
perl script to search for files containing text 3 79
Using Perl DBI to query oracle 3 43
Call Shell Script from Perl Script 6 102
I have been pestered over the years to produce and distribute regular data extracts, and often the request have explicitly requested the data be emailed as an Excel attachement; specifically Excel, as it appears: CSV files confuse (no Red or Green h…
A year or so back I was asked to have a play with MongoDB; within half an hour I had downloaded (http://www.mongodb.org/downloads),  installed and started the daemon, and had a console window open. After an hour or two of playing at the command …
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question