lsof command HowTo - Linux / Unix Q & A from nixCraft

How to check open ports in Linux using the CLI

last updated July 22, 2019 in CentOS, Debian / Ubuntu, Linux, Networking, RedHat and Friends, Security, Suse

I need to list all open ports in Linux cloud server. How do I check open ports in Linux using the CLI? Can you give me the command to check open ports in Linux operating system?

How do I check if a port is in use on Linux?

last updated April 16, 2019 in Linux, Networking

I am a new Linux system user. I need to find out which process is listening on a port on Linux using the command line. How do you find out which process is listening on a port on Linux operating systems?

Linux: Find Out What Is Using TCP Port 80

last updated August 22, 2013 in Commands, Linux, Networking

How do I find out what is listing or using tcp port number 80 on Linux based systems using command line options?

Linux: Find All File Descriptors Used By a Process

last updated July 1, 2011 in Linux

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

last updated January 10, 2011 in Linux, Networking

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

Linux Find Out Which Process Is Listening Upon a Port

last updated April 21, 2020 in Linux

How do I find out running processes were associated with each open port on Linux? How do I find out what process has open TCP port # 111 or UDP port 7000 under Linux using the CLI?

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

last updated August 22, 2010 in Apache, CentOS, Linux, RedHat and Friends, SELinux

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?