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Category Archives: tips & tricks
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[one-liner]: What options were used to boot my Linux Kernel?
Background
In newer versions of Linux distros the GRUB2 configuration file is often times locked down so that you need sudo rights to see what options the Linux Kernel was booted with. Using the following tip you can see these options as just a regular “joe” user.
Solution
This tip is pretty straightforward, since now the options are […]
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Posted in kernel, linux, one-liner, Syndicated, tips & tricks
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[one-liner]: Linux Runlevels
Background
Determining a systems runlevel can be useful when setting up a headless server or determining if a system is being used as a server or as a workstation. Thankfully it’s pretty easy, using a number of commands. But before we get started, a little background.
Runlevels are a concept from UNIX System V used by the […]
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Posted in linux, one-liner, Syndicated, sysadmin, tips & tricks
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[one-liner]: Improving the performance of SSH Tunnels using Alternative Ciphers; when displaying X11 Apps
Background
Have you ever used an ssh tunnel to try and remotely display an X windowed application and then wished you hadn’t, because the performance was so bad you’d be waiting till next week for the window to come up?
Read on because here’s how you can make this much more tolerable & usable.
Solution
There are 2 […]
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Posted in one-liner, shell, ssh, Syndicated, tip, tips & tricks
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[one-liner]: Securing your Subversion Password using GPG Agent
Background
If you’ve ever dealt with subversion on Unix, one of the annoyances is that it essentially stores it’s password in clear text under your $HOME/.subversion/auth/svn.simple directory in text files. Not a huge deal to a single developer or user but if you work in a large company or even a small one this is a […]
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[one-liner]: Dealing with UEFI
Background
UEFI looks to be a major pain in the @$$, but like it or hate it everyone in the Linux community will need to learn to navigate it. Here’s a list of useful UEFI resources that I’ve come across as I’ve started to get smarter about how to deal with this beast.
Solution
Wikipedia
Unified Extensible Firmware […]
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Posted in centos, fedora, one-liner, redhat, rhel, Syndicated, tips & tricks, UEFI
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[one-liner]: Debugging Bash Scripts
Background
From time to time it’s useful if you can turn up the debugging messages that come from Bash, when working out either interactive or shell script problems. Here are 2 methods that can help in getting down to the details.
Solution
There are essentially 2 methods.
Method #1: -x method
When writing a shell script you’ll sometimes want to […]
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[one-liner]: Why is Conky reporting a lower CPU frequency, when my CPU frequency is actually much higher?
Background
If you’ve every dealt with Conky you may have gotten a little confused when you’re trying to get it to display your CPU frequency like so:
1
${freq_g cpu0} Ghz
… and Conky is reporting your CPU frequency as 1.12GHz when in fact it’s actually much higher than that, say 2.67GHz. Most likely this is being caused by […]
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Posted in conky, linux, monitoring, one-liner, performance, Syndicated, sysadmin, tips & tricks
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[one-liner]: How do you capture the status of a command ($?) in Bash, when run through a pipe?
Background
While answering questions on the stackexchage website Unix & Linux I saw the following question which was about something I’d encountered, but until today never knew how to accomplish, so I’m posting it here for my own reference in the future.
The question?
How do you get the exit status ( $? ) from the command haconf […]
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[one-liner]: Checking out a HDD’s Health using the Command Line Tool udisk
Background
Here’s a quick tip for checking out the overall health of your computer’s hard drive. It makes use of a little known tool called udisks which provides access to information about storage devices from the D-Bus interface.
Solution
Before we jump into udisks here are some resources that might prove useful when dealing with the design/architecture of […]
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Posted in HDD, linux, monitoring, one-liner, performance, Syndicated, sysadmin, tips & tricks
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[one-liner]: Free Online Programming Courses
Background
This post is intended to capture various online resources for taking classes and/or getting training in anything. They’re predominately programming language and software engineering courses but their are other tracks that focus on history and chemistry, for example.
Solution
This is by no means meant to be an exhaustive list, it’s a clearinghouse of the different resources […]
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