In this Linux tip, learn how to use the head and tail commands. They're basic commands that every Linux user should know. The head command is generally used to display the top lines in a text file, and the tail command shows the last lines in a file.
A year into the coronavirus pandemic, IT continues to support remote employees. As organizations begin planning to bring workers back into the office, IT must now consider upgrading their networks to best support employees in a post-COVID world. IDC ...
In this Linux tutorial, learn how to use the pi command. You probably won't need it very often, but, if you need to calculate pi to some arbitrary number of digits, you'll probably be surprised at how easy this can be.
In this Linux tip, learn how to use the rig command. It randomly generates name, address and phone number listings. It's useful when you're testing an application and need hundreds or thousands of addresses to make sure that it works correctly.
In this Linux tip, learn how to use the lslogins command. It provides some useful details on user accounts and logins. In its simplest form, you could just type lslogins, but without using sudo, some of the details you'll probably want to see won't b...
In this Linux tip, learn how to use the autoexpect command. You can use it to build expect scripts that let you run scripts without having to provide answers interactively.
In this Linux tip, learn how to use expect. It's a tool that allows you to automate interactions with other scripts so that you can run them with a set of predefined answers.
In recent months, IDG invited 30 senior IT leaders to participate in our CIO Think Tank program to discuss their multicloud architecture goals along with the top challenges they face in making multicloud a reality. These conversations across six hour...
Kristie Grinnell is Global CIO and Chief Supply Chain Officer at General Dynamics Information Technology, and her philosophy isn’t just “cloud-first,” but “why not cloud?” This approach is how she leads 30,000 employees to deliver enterpris...
In this Linux tip, learn how to use the ip neigh command. It works a lot like the arp command, but is considerably newer and still in active development. It provides network details – IP and MAC addresses -- along with an indication of each system'...
In this Linux tip, learn how to use the arping command. If it sounds like a combination of arp and ping, that should serve as a hint for how it works. It's a command that you can use to discover or probe systems on your local network.
In this Linux tip, learn how to use the pidof and pgrep commands. Both help you to find the process IDs (PIDs) of running processes. All you have to do is enter the command followed by the name of the process you're interested in.
In this Linux tip, learn how to use the screenfetch and neofetch commands. They're actually both bash scripts that you'll need to install if you haven't already. Once installed, without anything more than invoking them by name, either one will fetch ...
In this Linux tip, learn how to use the groupmod command. It’s a command that allows you to change the name of a user group. It does this by changing the entry in the /etc/group file (the line that connects the group name with the group number) and...
In this Linux tip, learn how to use the usermod command. It’s a command that allows you to make a lot of different changes to user accounts without having to edit configuration files.
In this Linux tip, learn how to use the factor command. It’s not one that you will likely need very often, but it can be very useful when you’re doing math on the command line. It provides the factors for any number you offer as an argument.
In this Linux tip, learn how to use the disown command. It provides a way to detach a process you’re running from your login session so that it isn’t killed (hung up on) when you log out. This means that the process can continue running after you...
In this Linux tip, learn how to use ranger. It’s a tool that allows you to easily browse files in a terminal window, but in a much different manner than you normally would on the command line.
In this Linux tip, learn how to use the tar command. It’s used to create (and extract contents from) file archives. The name “tar” stands for “tape archive” though “tape” is rarely part of the equation anymore.
Learn each of the seven layers of the Open Systems Interconnection, or OSI, model with this easy mnemonic trick. The OSI Model was developed in order to help troubleshoot network problems, promote interoperability among devices, and to simplify the t...
In this Linux tip, we’re going to look at the lscpu command that provides a lot of information on your system’s CPU or CPUs.
In this Linux tip, learn how to use the unset command. It’s a command that removes an environment variable from your current login session.
In this Linux tip, learn how to use the look command. It allows you to easily pick out lines that begin with a given string from a file that you specify. The look command only matches beginnings of lines and doesn’t work with wild cards. For more c...
In this Linux tip, learn how to use the df command. It reports on disk space. It’s important to check disk space from time to time to ensure that the system is not about to run out of space.
In this Linux tip, we’re going to look at the chkrootkit command. It’s a command that will examine your system for rootkits -- generally malicious software that enables unauthorized access to a system.
In this Linux tip, we’re going to look at the dig command. It’s generally used to troubleshoot problems with DNS (the domain naming system). Learn how to get information on what DNS can tell you about a system you’re hoping to connect to.
In this Linux tip, learn how to use the mkdir (make directory) command. It’s one of the basic commands that every Linux user ought to know, but there are some rules and a couple options that aren’t obvious.
In this Linux tip, learn how to use the uptime command. It tells us how long the system has been up and running – and provides some additional information as well.
In this Linux tip, learn how to use the finger command. It provides information on the selected user account. Once it’s installed, all you have to do to use the finger command is type “finger” followed by the username of the account you want to...
The U.S. Commerce Department has continued to block many U.S. tech companies from working with Huawei. And now the U.S. government has taken measures a step further by prohibiting all companies from selling to Huawei if they use American IP and/or eq...
In this Linux tip, we’re going to look at the && operator that provides a useful functionality in scripts. It represents an AND operator. But, first, to demonstrate how this operator works, we’ll run some simple commands on the command line.
In this Linux tip, learn how to use the OR (||) operator that provides a useful functionality in scripts. But, first, to demonstrate how this operator works, we’ll run a couple simple commands on the command line.
In this Linux tip, learn how to use the chage command. The name stands for “change age” and allows Linux admins to manipulate aging settings for user accounts – when passwords will must be changed or accounts will expire.
With more of us connecting with our healthcare providers virtually during the coronavirus pandemic, hackers may find it more appealing to attack medical or hospital systems. Increased amounts of data due to telemedicine and medical internet of things...
In this Linux tip, learn how to use the mv (move) command. It allows you to rename files, move files to other places in the file system or do both of those things at the same time.
When remote-access VPNs are heavily used, traffic to and from the internet can tax the corporate internet connection as well as the security measures. That's where split tunneling comes in. Split tunneling is when only the traffic destined for resour...
How to use the script command to capture a series of commands that you run along with any output that they generate. This be helpful when you are documenting a process or testing a series of commands.
There is no evidence that 5G poses health risks or dangers to humans, but that hasn’t stopped people from circulating conspiracies about 5G’s unproven link to the coronavirus pandemic. Juliet explains why 5G poses no known health risks to the pub...
Edge computing is what it sounds like: computing that takes place at the edge of corporate networks, with “the edge” being defined as the place where end devices access the rest of the network – things like phones, laptops, industrial robots, a...
In this Linux tip, we’re going to look at xz command. It’s a relatively new command for compressing and decompressing files and works a lot like zip and bzip2. With xz, compressed files will take on the extension “xz”.
The Federal Communications Commission (FCC) in the U.S. recently approved some wireless spectrum within the 6GHz band for Wi-Fi 6 use. This will nearly quintuple the existing Wi-Fi 6 spectrum. The version of Wi-Fi that will take advantage of this spe...
With the adoption of 5G, carriers may offer some higher-paying customers more bandwidth than others on the same physical network infrastructure. Principal analyst and president of J. Gold Associates, Jack Gold, talks with Juliet about what network sl...
The at command allows you to schedule tasks to run at some other time – whether later that same day or way in the future. It allows you to schedule simple commands or complex scripts to run when you need them to run. Unlike the cron command, at is ...
The coronavirus pandemic forced IT teams around the world to adapt to serving an almost entirely remote workforce. But once we all return to work in an office, those lessons shouldn’t be forgotten. Jack Gold, president and principal analyst at J. G...
The convert command allows you to manipulate image files on the command line and has a LOT of options. We’ll just look at a few of the many kinds of changes you can make.
With IT and security teams stressed due to the COVID-19 crisis, it’s more important than ever to make sure you’ve prepared your network for a disaster.
The tac command displays text files “upside-down” — the last lines show up first and the first last. If you ever need to invert a file, you’ll find this quick and easy command ready to make the task easy.
In this Linux tip, learn to use the ln command, which can create either type of link on Linux systems.
Due to concerns around the coronavirus and COVID-19, you might be working from home. We are too! On today’s first remote episode of Today in Tech, Juliet discusses if your home Wi-Fi network will be able to handle a huge spike in videoconferencing,...
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