System Monitoring Tools Every SysAdmin Should Know

Linux Change Your Own Password

Login using the ssh client or open a command-line terminal (select Applications > Accessories > Terminal), than type the following command:
$ passwd

Rename an Account [ User ID ]

You need to use the usermod command. It can modify the system account files (such as /etc/passwd) to reflect the changes that are specified on the command line. The syntax is as follows:

In this example, rename login id from yuva to yahoo. Open a command-line terminal (select Applications > Accessories > Terminal), and then type the following command

 sudo usermod -l yahoo yuva

To verify new changes, enter:

$ id yahoo

20 Linux System Monitoring Tools Every SysAdmin Should Know

#1: top - Process Activity Command

The top program provides a dynamic real-time view of a running system i.e. actual process activity. By default, it displays the most CPU-intensive tasks running on the server and updates the list every five seconds.

#2: vmstat - System Activity, Hardware and System Information

The command vmstat reports information about processes, memory, paging, block IO, traps, and cpu activity.

# vmstat 3

#3: w - Find Out Who Is Logged on And What They Are Doing

w command displays information about the users currently on the machine, and their processes.

# w username
# w yuva