Author Archive: Pungki Arianto

Pungki , currently working as a Linux / Unix administrator for a banking company. He love to work in Linux / Unix since it's fun for him. He is also interested in information technology, information security and writing.

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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 which don’t print the username on their shell. How do I run whoami To run […]

December 12, 2013 | By
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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. What is dmesg dmesg is a command that print kernel messages into your screen. What […]

December 10, 2013 | By
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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% . People changed. Sometimes leak comes from inside, not from outside. To prevent that thing, you […]

December 10, 2013 | By
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Linux vnstat - A Console Network Traffic Monitoring Tool

There are a lot of network monitoring tool in the internet. The most popular one may be Multi Router Traffic Graph or known as MRTG. To access MRTG, we need to install a web server. If you don’t want to install a web server, you may want to use vnstat as an MRTG alternative. Vnstat […]

December 8, 2013 | By
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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 a built-in command which shipped in every Linux distribution. To run cal, just type cal […]

December 8, 2013 | By
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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 and time can make you can’t compile an application? Because date and time is important, […]

December 7, 2013 | By
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Using Password Aging to Secure your Linux Access

Security is playing important role in computer networks. Since you can’t trust anyone in the network, you have to protect your server. Sometime security hole comes not from outside, but from inside. One of the example is the validity of username and password. As an System Administrator, you may understand that you have to manage […]

December 6, 2013 | By
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Built in Audit Trail Tool - Last Command in Linux

If you are working as a server administrator, you may understand that you have to protect your server. Not only from the outside, but you have to protect it from the inside. Linux has one built-in command to see who is the last logged in user into your server. The command is last. This command […]

December 3, 2013 | By
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Linux ntopng - Network Monitoring Tool Installation (Screenshots)

Nowdays computers are connected between each other. From the small area such as your home Local Area Network (LAN) until the the biggest one which we call - Internet. When you are managing a network computer, you are managing one of the most critical component. Since most of developed application is web based application, the […]

December 2, 2013 | By
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How To Display And Set Hostname in Linux

With more and more computer connected to the network, computer need to have an attribute to make it different to each other. Same as human in the real world, computer also hava an attribute which named hostname. What is hostname From its manual page, hostname is used to display the system’s DNS name and to […]

December 1, 2013 | By
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Wajig - Unified Package Management Front-end for Debian

Debian users - and it’s derivative such as Ubuntu and Linux Mint users - must be familiar with APT (Advanced Package Tool). It’s a tool for package management. APT comes with several tools. Apt-get, apt-cache, apt-mark, apt-key are the examples. It's also used as an engine for another front-end such as Aptitude or Synaptic in […]

November 27, 2013 | By
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Linux Uptime Command - Find How Long Your System Been Running

Information about how long the system has been running may not critical for some people. But for server administrators, it is critical. Servers which running mission critical application must be running as long as possible. Sometimes it must be zero-downtime. So, how can we know information about it? On Linux operating system, we can use […]

November 24, 2013 | By
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20 Linux Cat Command Examples For File Management

In Linux operating system most of configuration files, logs even shell scripts are in text file format. There is why we have numbers of text editors in Linux. When you just need to see the content of those files, you can use a simple command named cat. From cat manual page it says cat is […]

November 23, 2013 | By
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Squid Analyzer - A Parser for Squid proxy access.log File

Squid is one of the most popular proxy software in Linux world. It’s powerful, it has a lot of features and of course, it’s free. Squid has been used by ISP’s since the early 1990 to provide faster download speeds and reduce latency. For common proxy use, I believe squid is implemented in most companies […]

November 21, 2013 | By
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