commands for linux troubleshooting (draft)

14 June 2016

port

Check to see if the server is listening on the host:

sudo lsof -i :8080

sudo fuser 9092/tcp
sudo fuser -n tcp 9092

sudo netstat -ant | grep :2181
sudo netstat -peanut | grep ":5140"

kill process on specific port

fuser -k 8080/tcp
kill -9 $(lsof -t -i:8080)

kill -9 $(lsof -t -i:9092)
fuser -k 9092/tcp

checking port 8080 is open or not

cat /etc/services | grep 8080

connecting to open port

sudo yum install telnet
telnet localhost 8080

scanning port for open port & running services on it

sudo yum install nmap
sudo nmap -sT -O localhost

permission

Changing the ownership of all sub-directories

sudo chown -R snikam:snikam ./Prod/

process

process id of running program

ps aux | grep java

kill prcess with given id

ps aux | grep -i firefox | awk {'print $2'} | xargs kill -9

Shutdown/Restart

Restart now

sudo shutdown -r now

shutdown now (immediately)

sudo ?

networking

Assign static ip

Check if it is configured

sudo ifdown eth0

Edit like this (just the important lines):

sudo gedit /etc/network/interfaces

auto eth0
  iface eth0 inet static
  address <static IP address>
  netmask <netmask>
  gateway <default gateway>
  pre-up sleep 2

Activate the new IP

sudo ifup eth0

Python

ModuleNotFoundError: no module named <X> Error

import sys
import os

# add dir to PYTHONPATH
sys.path.append(os.getcwd())

export PYTHONPATH=${PYTHONPATH}:${HOME}/abcPythonModule 

other

vs code - column selction on Mac

Shift + option + Command + Right/Left

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