check port linux in use code example

Example 1: linux how to see ports in use

# Any of the following
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 # see a specific port such as 22
sudo nmap -sTU -O IP-address-Here

Example 2: netstat command in linux to check specific port

netstat -tulpn | grep :80

Example 3: linux see used ports

netstat -tulpn

Example 4: edit default port for linux server

# Change Apache, FTP, and SSH Default Port To A Custom port
nano /etc/apache2/ports.conf

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