lsof lists open files. This CLI tool is available on most *nix OSes.
On linux, a much quicker alternative may be to use fuser
List files open by a given user
lsof -u username
show listening TCP sockets
Since everything in unix is a file, including network sockets, you can list open sockets and the programs that have them open. However, this is notably unreliable in Docker, so don't trust this completely. When in doubt, double check against
lsof -iTCP -sTCP:LISTEN
Show a sorted list of processes by listening port
lsof -iTCP -sTCP:LISTEN -P | sort -k2 -t: -n
show what process is using port 80 or 443 with port numbers
# -n makes lsof not resolve hostnames from ip addresses # -P makes lsof not resolve service names for port numbers. # -iTCP shows IP TCP sockets. lsof -nP -iTCP:80,443
show the selinux context for sockets
lsof -i -Z
See man page for extended syntax around Z
- Process Explorer - LSOF type functionality for windows.