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Member since: June 2008
Sandra Henry-Stocker has been administering Unix systems for more than 25 years. She describes herself as "USL" (Unix as a second language) but remembers enough English to write books and buy groceries. She currently works for TeleCommunication Systems -- a company that builds innovative technologies to make critical connections happen -- where no one else necessarily shares any of her opinions. Send comments and suggestions to firstname.lastname@example.org.
- Sometimes what seems like the simplest of questions can have you scrambling for answers. Today's seemingly simple question is "How can a bash script identify its own location?"
4 days 41 min ago
- Sorting data numerically and alphanumerically isn't generally much of a challenge on Unix systems, but sometimes .5 is smaller than .11.
1 week 4 days ago
- Last week's post provided some tips and tricks for debugging scripts. This week's provides some even better ones!
2 weeks 4 days ago
- All kinds of things can go wrong with your shell scripts, but they don't have to. Let's look a some debugging tips that can help ensure your scripts run the way you intend.
3 weeks 5 days ago
- The kill command provides a lot more functionality than just terminating processes. You can use it to send any of more than 60 signals to processes and what happens next depends on the signal, the process and maybe even your settings.
4 weeks 3 days ago
- It's easy to find files on Unix systems. You can find them by almost any criteria that you can imagine. The bigger challenge is deciding how to describe what you're looking for and deciding what to do with the files once you find them.
5 weeks 2 days ago
- One of the most endearing qualities of Unix devotees is how determined they are to be as efficient as possible. Why type three characters if you can do the same thing with two? And one of the best ways to cut down keystrokes is to turn common commands into aliases.
6 weeks 2 days ago
- Unlike federal shutdowns, Unix shutdowns (and reboots) are generally smooth and easy, don't cost $24B and leave the system in better shape.
7 weeks 2 days ago
- Ever need to look into a Unix process to see exactly what it's doing? The ps and top commands only give you a bird's eye view of what's going on. But strace will let you peer into a process' inner workings.
8 weeks 2 days ago
- The CISSP is a valuable certification, but it takes a lot more than just your many years of experience to prepare for it. You will likely have to learn about a lot of technology and processes that you’ve never worked with, some of it not especially current and all of it a lot less vendor-specific than you’ve ever imagined.
9 weeks 3 days ago
- Oh, Danny Boy, the pipes, the pipes are calling. But if you want to call them back, you need to give them names.
10 weeks 3 days ago
- Sandra Henry-Stocker wrote Security: Book Review -- The Practice of Network Security Monitoring, Richard Bejtlich, no starch press, July 2013If you work in cyber security or incident response, you MUST read this book. It is the best book ever for preparing yourself and your staff for handling inevitable network intrusions.
11 weeks 3 days ago
- No matter how much disk space you add to a system, sooner or later you're going to run short. But watching disk space get slowly used up is a lot like watching grass grow. How do you avoid a disk space crisis and avoid being lulled into a data stupor?
12 weeks 2 days ago
- The only thing wrong with sed is that most of us barely grasp how powerful it is. We use it in pipes to change "this" to "that", but we rarely consider it for the big editing jobs where it could save us considerable time and effort -- especially when it comes to boring repetitious work.
13 weeks 2 days ago
- Moving files between Linux (and other) servers is a lot smarter and more versatile when you discover lftp.
14 weeks 3 days ago
- Log files on Unix systems can easily grow to hundreds of thousands or even millions of lines. Here's a simple way to pluck out every Nth line.
15 weeks 3 days ago
- The things that make you love a job or drive you to thinking about moving on may have less to do with how much you earn than whether you look forward to Monday morning.
16 weeks 7 hours ago
- Sitting in a chair for 40 or more hours a week might seem like the makings of a good life if it's combined with an impressive salary, but if you value your health and/or your career, you might rethink your priorities. This invaluable book could add years to your life and keep you feeling good well into retirement. Let me repeat that. This invaluable book ...
17 weeks 4 days ago
- You need to understanding routing tables if you're going to do any kind of network troubleshooting. Let's take a look at what Linux commands can tell you about how your system is making connections.
18 weeks 4 days ago
- Friday, July 26th,2013 is Sysadmin Day or "Systems Administrator Appreciation Day" -- a good reason to celebrate those individuals who devote themselves to keeping our servers available, usable and secure, but how do you go about thanking these geeky superheroes? First, you have to disentangle them from whatever tasks they're currently juggling and then you have to get and hold their attention long enough to express your appreciation.
19 weeks 6 days ago
- Firewall logs. There's never enough time to review them, but you can't ignore them. Here's one way to look for malicious connections without spending a lot of time at it.
20 weeks 4 days ago
- CSV (comma-separated values) files represent a common standard for transmitting data between applications. Like the more generic "flat files", each line in a CSV file represents a record. Exporting or importing data from and to applications such as Excel in CSV format is standard practice for a lot of applications. Hand a CSV file to a tool such as awk, however, and you may run into some problems. Let's look at the problems and at a handy Perl module that takes the stress out of working with CSV files on Unix systems.
21 weeks 4 days ago
- The grep command has a lot more options and "flavors" than the casual command line pioneer might expect, but there are some options and limitations that you should know about when you're working with big data files.
22 weeks 4 days ago
- Big data may be a tech buzzword of the moment, but Unix admins who need to hunt through logs to figure out what's going with their systems have been grappling with huge data sets for decades. Here are tips on command-line tools and techniques that can make sense of seemingly overwhelming data sets.
23 weeks 3 days ago
- Wise men say that you should never choose the easy path but, instead, live life fully. But when it comes to moving around the Unix file system, easy is good. And bash's builtin shopt command can make maneuvering even the most complicated file system paths easier.
24 weeks 3 days ago
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