Some useful Linux commands

To get process details of the specified processename.
ps -ef | grep [processname]
To kill the process with processid.
pkill -9 [processid]
To find ip address

 sudo /sbin/ifconfig
To find version information.             uname -a
To check open port.                                netstat -ano | grep “1521”
To create jar                                                    jar -cvf <jar_name> <files to be added in jar>
To create User.                                      useradd <username> -passwd                        This will prompt to enter password
To change the root password:
sudo passwd
To change logged in user’s password:
passwd
To change non logged in user’s  password:
sudo passwd USERNAME

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