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check if port is available linux Code Example
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
check if port is available linux 
sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo ss -tulpn | grep LISTEN
sudo lsof -i:22 ## see a specific port such as 22 ##
sudo nmap -sTU -O IP-address-Here
Source: www.cyberciti.biz
linux see used ports 
netstat -tulpn
check port status linux 
You can check if a process listens on a TCP or UDP port with netstat -tuplen.
Source: serverfault.com



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Horje