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Author Archives: Network World Data Centre

How to use the expand command: 2-Minute Linux Tips

In this Linux tip, we’re going to look at the expand command. It's used to replace tabs in text files with space characters (sometimes referred to as "blanks").

How to address emissions concerns for power-hungry data centers

Data centers are a critical, but often power-hungry, part of the enterprise. But, why exactly do data centers require so much energy? And how can businesses address emissions concerns as well as cut back on the costs associated with cooling data centers? Ashish Nadkarni, group vice president within IDC's Worldwide Infrastructure Practice, joins Juliet to discuss the status of data center efficiency, what it means within the context of green IT and how technology has advanced to make servers more efficient.

How to use the sequence command: 2-Minute Linux Tips

In this Linux tip, we’re going to look at the seq (sequence) command. It provides a very easy way to generate a sequence of numbers and gives you a lot of control.

How to use the true and false commands: 2-Minute Linux Tips

In this Linux tip, learn how to use the true and false commands. What they do is very simple. The true command generates an exit code of 0 (no problems) and the false command generates a value of 1.

How to use the fold command: 2-Minute Linux Tips

In this Linux tip, learn how to use the fold command. It allows you to limit the length of lines when displaying a text file by "folding" long lines into smaller pieces and, of course, you can save the shortened lines into another file.

How to use the csplit command: 2-Minute Linux Tips

In this Linux tip, learn how to use the csplit command. It's a command that lets you split a file into pieces based on its content. For example, you might separate a file based on chapter headings, dates or content separators of some kind. Think of "csplit" as meaning "context split."

How to use the nethogs command: 2-Minute Linux Tips

In this Linux tip, learn how to use the nethogs command. As the name implies, nethogs will display information on how much processes using or "hogging" your network bandwidth.

How to use the whois command: 2-Minute Linux Tips

In this Linux tip, learn how to use the whois command. It sends requests to what are called WHOIS servers. These servers maintain numerous details on domain registrations. So, when you ask about a particular domain, you get a pile of details.

How to use the dmesg command: 2-Minute Linux Tips

In this Linux tip, learn how to use the dmesg command. It's a command that displays the content of the kernel message buffer – messages that were sent by various system services such as device drivers. You can view a lot of information that you would normally not see and get insights into how your system is working.

How to use the free command: 2-Minute Linux Tips

In this Linux tip, learn how to use the free command. It doesn't mean a command that you are not paying for, but one that tells you how much memory – physical and swap – is being used on your Linux system including how much is "free" and how much is available.

How to use the bpytop command: 2-Minute Linux Tips

In this Linux tip, learn how to use the bpytop command. It's one of many "top" commands (like top and htop) that make it easy to gauge many aspects of system performance on Linux.

How to use the cheat command: 2-Minute Linux Tips

In this Linux tip, learn how to use the cheat command. It provides what have come to be called "cheat sheets" on a huge assortment of Linux commands. Once installed, all you have to do is type "cheat" followed by the name of the command for which you want to see sample commands.

How to use the xargs command: 2-Minute Linux Tips

In this Linux tip, learn how to use the xargs command. It accepts input that is piped to it and then uses that input as arguments to whatever command you specify.

How to add comments in scripts: 2-Minute Linux Tips

In this Linux tip, learn how to add comments to your scripts. It's a super easy thing to do and can make it a lot easier for you or someone else to figure out what your script is intended to do – especially if the script is complex or you haven't looked at it in a long time.

How to use the sar command: 2-Minute Linux Tips

In this Linux tip, learn how to use the sar command. The name "sar" stands for "system activity report". It provides details on all aspects of system performance including system load, CPU usage, memory use, paging, swapping, disk usage, device load, network activity and so on.