[process listening on port] 3 Ways to Find Out Which Process Listening on a Particular Port https://www.tecmint.com/find-out-which-process-listening-on-a-particular-port/ #networking #port #debug #ops

fuser.sh

# Least recommended
#
# WARNING: Do not use delete flags with fuser!  - Courtesy of ssolt
#
# Source:
#   https://www.tecmint.com/find-out-which-process-listening-on-a-particular-port/
#
# $ sudo yum install psmisc	#RHEL/CentOS 
# $ sudo apt install psmisc	#Debian/Ubuntu
# $ sudo dnf install psmisc	#Fedora 22+

fuser 80/tcp

# Then find the process name using PID number with the ps command like so.

ps -p 2053 -o comm=
ps -p 2381 -o comm=

lsof.sh

# Preferred
#
# Source:
#   https://www.tecmint.com/find-out-which-process-listening-on-a-particular-port/
#
# $ sudo yum install lsof       #RHEL/CentOS 
# $ sudo apt install lsof		#Debian/Ubuntu
# $ sudo dnf install lsof		#Fedora 22+

lsof -i :80

netstat.sh

# Preferred
# Most commonly available
#
# Source:
#   https://www.tecmint.com/find-out-which-process-listening-on-a-particular-port/
#
# $ sudo yum install net-tools	#RHEL/CentOS 
# $ sudo apt install net-tools	#Debian/Ubuntu
# $ sudo dnf install net-tools	#Fedora 22+

netstat -ltnp | grep -w ':80' 

#In the above command, the flags:
# l – tells netstat to only show listening sockets.
# t – tells it to display tcp connections.
# n – instructs it show numerical addresses.
# p – enables showing of the process ID and the process name.
# grep -w – shows matching of exact string (:80).