In this Linux Tip, learn to use the iotop command, which helps to monitor I/O usage for your disks.
In this Linux Tip, you'll learn to use the W diff command, which displays the content of compared files, showing one copy if the files are identical.
In this Linux Tip, you'll learn to use the sdiff command, which compares text files side by side.
In this Linux tip, we’re going to look at the diff3 command. It’s similar to the diff command, but allows you to compare the contents of three text files instead of just two. In addition, the formatting of the output makes it easy to understand h...
In this Linux tip, we’re going to look at the colordiff command. It displays the differences between two files like the diff command, but adds color whenever the content is different. This first command has no output because the files are the same....
In this Linux tip, we’re going to look at the cmp command. It’s a command that allows you to compare the content of two text files. If the files that you are comparing are identical, there will be no output.
In this Linux tip, we’ll take a look at how you can test whether a string or variable includes some regular expression or substring you want to test for.
In this Linux tip, we’ll look at how you can use the grep command to look for more than one value in a single command. This can be useful when you want to select lines of two forms, but ensure they will appear in the same order as they do in the fi...
In this Linux tip, we’re going to look at a command that allows you see how many days have passed since the beginning of the Linux epoch – Jan 1, 1970. To begin, we use the command below to display the number of seconds since the epoch began on J...
In this Linux tip, we’re going to take a look at the pv (pipe viewer) command that can provide some reassuring visual feedback when some process you will be running might take a long time to complete. In this simple example, everything will run ver...
In this Linux tip, we look at the stat command. Like the ls command, stat displays important details about a file – like permissions and ownership, but in a much different and surprisingly useful way.
In this Linux tip, we’re going to look at what happens on many Linux systems when someone mistypes “ls” – typing “sl” instead. What you can anticipating seeing (provided the sl command has been installed with one of the commands shown bel...
In this Linux tip, we're going to take a look at the shuf command.
In this Linux tip, we’ll take a look at the chmod command for changing permissions on a Linux file.
In this Linux tip, we’ll take a look at the apropos command and how it can help you identify commands that you want to use. The meaning of the word apropos is “fitting and to the point”. When you use this command on the Linux command line, you ...
In this Linux tip, we’re going to examine the shred command – a command that allows you to overwrite the content of a file with randomized data so that it is no longer readable and basically impossible to recover.
In this Linux tip, we’re going to look at directories on Linux – basically folders that are set up to house related files. Whenever you use a command like “ls dirname” for a directory, you will see a list of the files it contains.
In this Linux tip, we’re going to examine some commands for generating reports on who is logging into a Linux server. The data for login activity is stored in the /var/log/wtmp file.
In this Linux tip, we’re going to look at the cal (calendar) command. This command allows you to display a calendar for a month or even for a year. Using a command like this, you display a calendar for the current month with the today highlighted.
In this Linux tip, we’re going to take a quick look at the /etc/shadow file on Linux systems. It contains a lot of useful information pertaining to user accounts – and is a file that can only be viewed or changed with root or sudo access.
In this Linux tip, we’ll look at how you can “source” files on the Linux command line. “Sourcing” means reading the file and running the commands that it contains – even if the file isn’t set up with execute permissions. There are two w...
In this Linux tip, we’re going to look at timestamps used on Linux systems. There are actually three of them and they represent the date and time that the file was last accessed, the time it was last modified and the time it was last changed. Modif...
In this Linux tip, we take a look at the who command – a command that tells you who is logged into the system. If you’re working on a Linux server, you might see that a number of people are logged in. The who command also tells you where the user...
In this Linux tip, we’re going to take a look at epoch time – the way Unix and Linux systems store dates and times. Unix and Linux systems don’t store dates and times in a way that includes months, days and years in the way that you see them di...
In this Linux tip, we’re going to look at the –help option that is available with most Linux commands. Type a command name followed by the argument --help and you will get some information on the command and its options.
This Linux tip explains how to locate files based on several different criteria.
In this Linux tip, we take a look at long file listings – using the ls -l command to examine the provided details.
In this Linux tip, we’re going to look at the easiest way to empty a file of its contents while not deleting the file. All you have to do is point a greater-than sign at a file and its contents are removed.
In this Linux tip, we’re going to look at if-then-else and if-then-elsif commands. Both are frequently used in bash scripts to make running a series of commands much easier.
In this Linux tip, we’re going to look at case statements – commands that are used in bash scripting to run shell commands depending on the value of some variable or command output.
In this Linux tip, we’re going to look at how the greater than symbols work. Both allow you to save the output of Linux commands to files, but they’re not the same.
In this Linux tip, we’ll look at the touch command. It’s a command that can be used to create an empty file or update the time stamp on an existing file.
In this Linux tip, we’ll look at the whoami command. It’s a very simple command that displays your username.
Before we all got obsessed with generative artificial intelligence, the technology world was obsessed with connecting everything to “the Internet of Things” – street lights, water sensors, buildings, locks, cameras, etc. Disruptions from the pa...
With many companies and organizations going through IPv4 to IPv6 migration, they may be left with a large block of IPv4 addresses that can still provide value to other groups. Lee Howard, senior vice president of IPv4.Global, chats with Keith about t...
Even though widespread deployment isn’t expected until 2030, many wireless industry officials are already discussing 6G wireless and what it could mean for carriers, businesses and consumers. Keith chats with analyst Jack Gold about what obstacles ...
In this video transcript, Sandra Henry-Stocker discusses how to calculate factorials on a Linux system. She explains that factorials are the multiplication of numbers starting with a specified number and decreasing incrementally until reaching 1. To ...
In this episode, Sandra Henry-Stocker, author of the "Unix as a Second Language" blog on NetworkWorld, explores the use of the "nohup" (no hangup) command in Linux.
In this episode, Sandra Henry-Stocker, the author of the "Unix as a Second Language" blog on NetworkWorld, introduces various ways to use the Linux date command. She demonstrates how to use the "date" command to display the current day of the week, d...
In this Linux tip, we’re going to look at several ways to increment and decrement numeric variables in bash.
In this Linux tip, we’re going to look at a way that you can view every Nth line in a text file – whether every other line, every third line, every eleventh line or whatever you want to see.
In this Linux tip, we’re going to look at the comm command – a Linux command that provides a report on the lines that are common in two text files along with those that only exist in one file or the other.
In this Linux tip, we’re going to look at an easy way to avoid saving commands in your command history. The first thing you need to do is set your HISTCONTROL variable to ignore commands that you enter followed by a space by using the “ignorespac...
In this Linux tip, we’re going to look at how you can get your command history to omit commands when you enter them more than once in a row.
In this Linux tip, we’re going to look at using the more command to view text files a selected number of lines at a time.
Beyond firewalls and perimeter security, a zero trust architecture allows security officials to better protect data and system access to both outsider and insider threats, adopting a mantra of "trust no one". We explain the concept in this video.
The newest version of Wi-Fi (version 6E) allows for higher capacity and bandwidth with the opening of 6GHz frequency spectrum, but with version 7 likely to occur next year, companies might decide to wait. Keith talks with IDC analyst Brandon Butler a...
In this Linux tip, we’re going to look at the greater than and greater than x2 operators and how they work. The greater than operator will take the output of the command preceding it and put it into the file that follows it.
In this Linux tip, we’re going to look at setting up sudo privileges for users on Fedora. The key is to make them members of the “wheel” group.
Hi, this is Sandra Henry-Stocker, author of the "Unix as a Second Language" blog on NetworkWorld. In this video, I'm going to show you how to take a file that was password-protected with vim and turn it back into a regular text file.
