List And Kill Processes That Are Using Socket Or File Or Library


Kill all processes using port 80

fuser -k -n tcp 80

Kill all processes using this path pr file in any way

fuser -k -n file -m /home


List processes using specific sockets

lsof -i                 #all the TCP/UDP connections
lsof -i tcp             #all the TCP connections
lsof -i udp             #all the UDP connections
lsof -i tcp:80          #TCP connections on port 80
lsof -i @    #Connection between my host and

List all files opened by a process

lsof -p 1456

List of all network connections and all files opened by a processs

lsof -i -p 1234

List of all network connections used by a specific process

#-a acts like an AND operator
lsof -i -a -p 1234

List of all files opened by user toto or 500 or by process 1234 or by process 12345

lsof -p 1234,12345 -u 500,toto


There’s a few parameters to netstat that are useful for this :

  • -l or –listening : Shows only the sockets currently listening for incoming connection.
  • -a or –all : Shows all sockets currently in use.
  • -t or –tcp : Shows the tcp sockets.
  • -u or –udp : Shows the udp sockets.
  • -n or –numeric : Shows the hosts and ports as numbers, instead of resolving in dns and looking in /etc/services.
  • -p or –program : Shows the PID and name of the program to which each socket belongs

You use a mix of these to get what you want. To know which port numbers are currently in use, use one of these:

netstat -atn           # For tcp
netstat -aun           # For udp
netstat -atun          # For both
netstat -nlapute | grep LISTEN | grep 11000

4. pldd & ldd : List dependencies/libraries used by a process

#using the executable
ldd /bin/ls

#using the PID
lsof -p PID
#can also look at /proc/$PID/maps
pldd pid

# Write all dependencies into a file
lsof -p 20346 >> temp.txt &&  lsof -p 20328 >> temp.txt && lsof -p  20330 >> temp.txt
# grep the specific library you're looking for and deduplicate them
cat ./temp.txt | grep mqm | awk -F " " '{  print $9 }' |  sort -u 
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