useful Linux commnad

gistfile1.bat

# find process holding port 
sudo netstat -lpn |grep :80

# run nginx command
sudo LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH /opt/nginx/sbin/nginx

#reload nginx 
sudo LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH /opt/nginx/sbin/nginx -s reload

#get all nginx process
ps fax | grep nginx

#get architecture of machine like number of cpu and all
lscpu

#get free memory of machine
free

#get io operation install iotop using following command
sudo apt-get install iotop

#get all ip from network (wlan or lan)
sudo arp -a

#login to another user over ssh
sudo su -s /bin/bash jenkins