linux check if port is 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: ubuntu check process on port

sudo lsof -i:22

Example 3: how to check list of open ports in linux

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 4: linux how to see ports in use

sudo netstat -tulpn | grep LISTEN

sudo lsof -i:22 # see a specific port such as 22

Example 5: linux see used ports

netstat -tulpn

Example 6: check if port is running in ubuntu

# Any of the following
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:22 # Port
sudo nmap -sTU -O IP-address-Here