System administrator must maintain the health of their server. One of the critical component is memory. When server memory is full utilized, it can slow down the server performance. To monitor memory utilization, Linux have another command that called free. [...]
LINUX COMMANDS
Understanding Linux cd Command with Examples
The cd command is the most basic command in *nix world. What linux cd command does is it changes your current working directory. This article details about this command, what this command can do and the internals about the command. [...]
Linux who command - Displays who is on the system
As a system administrator, we need to ensure who is on the system on a particular time. We must keep on eye to our servers. But of course we can’t do that for 24 hours a day. On Linux system, [...]
Linux id Command - Print user ID and group ID information
To log in into a computer, we need a username. Username is an identity to recognized by a computer. Based on it, computer will apply a set of rules to a someone that log in with that username. On Linux [...]
10 Linux iostat Command to Report CPU and I/O Statistics
A Central Processing Unit or CPU is the brain of the computer. All of the processing command is run here. Input/Ouput or I/O also play critical roles. The disks is used to provide data to the processor and keep the [...]
Linux vmstat Command - Tool to Report Virtual Memory Statistics
As we already know that computer must have memory which called RAM to make the computer works. RAM is refer to a physical memory that planted into the computer mainboard. This RAM is used to load applications such as browser, [...]
Linux lsusb Command to Print information about USB on System
Universal Serial Bus or USB was designed to standardize the connection of computer peripherals such as keyboards, pointing devices, printers, digital cameras, portable media players, disk drives and network adapters) - Source : Wikipedia Since it becoming a industry standard, [...]
Linux mpstat Command - Reports Processors Related Statistics
Generally today computer is using multiple processors. Or maybe 1 physical processor with 4 cores inside. On server side, more processors or cores means more power. But the other side, application also more power consumption. You may find a situation [...]
Linux whoami command - Knowing Who is Logged In
Generally, on your console you will find a username is printed on the command prompt. But in some shell such as csh, by default you will not see your username there. So this command particularly is used with the shell [...]
Linux dmesg Command to Print or Control the Kernel Ring Buffer
Sometime we underestimate the existence of logs. For system administrator logs is important. From log, we can analyze what cause an error. Linux has dmesg or Display Messages. Why we need to know about dmesg? Let’s start to explore it. [...]
How to use Linux Netcat Command as Port Scanner
Hi linoxide readers! Today we will teach you how to perform port scanning with the TCP/IP Swiss Army Knife tool, netcat. What is Netcat? nc, also known as the TCP/IP swiss army knife is a feature rich network utility which [...]
Linux w Command to See Who is Logged In And What Doing
As system Administrator, you must manage the users who logged in into your system. Allow them to do something, and restrict them do the rest. It’s a normal procedure for system Administrator. But you should not trust them 100% . [...]
Linux cal and ncal Commands to Display Calender
Beside date command, Linux also has cal command to display calendar. As its name, cal just show you the calendar in many ways. There is also ncal command which have same function with cal. Let’s start. Run cal Cal is [...]
Linux date command - Display and Set System Date and Time
Date on the operating system may only be considered as a timepiece. Especially on console mode, we do generally not see date as an important think. But for Administrator, this assumption is false. Do you know that a wrong date [...]