How to check open ports in Linux using the CLI

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

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?
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Linux: Find Out What Is Using TCP Port 80

How do I find out what is listing or using tcp port number 80 on Linux based systems using command line options?
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Linux: Find All File Descriptors Used By a Process

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

How do I check network connections under Linux using command line options?
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Linux Find Out Which Process Is Listening Upon a Port

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

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?
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lsof command