Frequently Asked Questions About Linux / UNIX » lsof command

Linux: Find All File Descriptors Used By a Process

Vivek Gite — Fri, 01 Jul 2011 23:06:46 +0000

How can I find all the file descriptors used by a process such as httpd (Apache web server) or mysqld (MySQL Database server)?

Linux: Check Network Connection Command

Vivek Gite — Mon, 10 Jan 2011 19:50:28 +0000

How do I check network connections under Linux using command line options?

Linux: Find Out Which Process Is Listening Upon a Port

Vivek Gite — Sun, 31 Oct 2010 18:02:23 +0000

How do I find out running processes were associated with each open port? How do I find out what process has open tcp port 111 or udp port 7000 under Linux?

Linux Syslogd: Nothing Gets Logged Using /dev/log And /jail/apache/dev/log

Vivek Gite — Sun, 22 Aug 2010 07:33:19 +0000

I've configured my Apache in chrooted jail at /jail/apache directory. However, my syslogd is not working and nothing gets logged using /dev/log and /jail/apache/dev/log. How do I fix this problem under CentOS 5.x AMD64 with SELinux?

Linux: Find Out Apache User Name

Vivek Gite — Mon, 20 Jul 2009 23:29:21 +0000

How do I find out my apache username under Linux operating system or CentOS Linux server?

/bin/bash: bad interpreter: Text file busy Error and Solution

Vivek Gite — Tue, 06 Jan 2009 12:02:52 +0000

Q. I'm getting an error as follows while trying to run a shell script over remote ssh session:

./myscript.sh /bin/bash: bad interpreter: Text file busy

How do I fix this error message and run the script?

FreeBSD Install lsof To Displays Information About Files Open to Unix processes

Vivek Gite — Wed, 16 Jul 2008 11:46:02 +0000

How do I install the free, open-source, Unix administrative tool called lsof (for LiSt Open Files) under FreeBSD operating system to displays information about files open to Unix processes?

Linux / UNIX: List Open Files for Process

Vivek Gite — Wed, 05 Mar 2008 17:08:24 +0000

Q. How do I list all open files for a Linux or UNIX process using command line options? A. Both Linux and UNIX like operating systems comes with various utilities to find out open files associated with process. Task: UNIX List Open Files For Process First use ps command to get PID of process, enter: [...]

Linux / UNIX Find Out What Program / Service is Listening on a Specific TCP Port

Vivek Gite — Wed, 20 Feb 2008 18:36:01 +0000

Q. How do I find out which service is listening on a specific port? How do I find out what program is listening on a specific TCP Port? A. Under Linux and UNIX you can use any one of the following command to get listing on a specific TCP port: => lsof : list open [...]

Find Out What Ports Are Listening / Open On My Linux & FreeBSD Server

Vivek Gite — Mon, 27 Mar 2006 21:56:00 +0000

Q. How do I find open ports on Linux / FreeBSD server?