BTRFS breathes new air into the old cp command. Suddenly it can be used to
create instantaneous copy-on-write (CoW) snapshots of single files via cp
--reflink.
When you want to convert a folder to a subvolume, you are best of with the following commands:
# mv folder folder_old
# btrfs su create ...Today's blog post will be about da pushing and da poppin'. More specifically the shell kind.
pushd <dir> is like cd <dir> except that it puts your previous location on
the directory stack before changing directory.
The directory stack can be inspected with dirs. The top is on the ...
The standard thread implementation on linux is pthreads and processes can
easily be created by issuing a fork function call. While I was studying
processes recently and reading the man pages for clone I found two important
pieces of information:
clone.There. Do I have your attention? With this post my intention is to finally figure out what this pair of instructions actually mean. I mean, they show up everywhere. To do this I'd like to deal with a simple C example.
int main(void)
{
for (int i = 0; i ...If you want to have binaries and libraries portable across linux systems, or even portable across locations on your filesystem, you need to know a bit about dynamic linking.
First read man ld.so, this will tell you about where libraries are looked up
when they are being searched for ...
I may be coming late to the SystemD bashing party, but I'd just like to say that I disagree with all of the opponents of this init system. It makes sense to have all of the basic components in one place (journal, basic networking), it does speed up booting ...
read moreSomething I find myself doing constantly is monitoring the performance of my machines. CPU usage, VM (virtual memory) usage and the likes.
The goto-application for this purpose is top. Top is great, and can be used on linux as well as BSD's, which I have been experimenting with recently ...
read moreI became interested in BSD's this week. The thought of installing one on my hardware had been crawling around my head ever since someone told me their "plan for the weekend is to install an original Unix while my girlfriend is away".
So I dived in and tried what ...
read moreThis one is pretty widespread and gets repeated a lot:
I don't use Linux because the battery life is worse than under Windows
Here's what I have to say about this.
My laptop is a Haswell machine. I say Haswell, because that's not only the processor generation ...
read morefg/bg/jobs is for jobs within a terminal
w to quickly show your terminals (that's a new one i didn't know before) who/whoami? useless now.
read moreI can't believe how awesome this is, it's the greatest thing to happen to me
since I got a laptop with a physical middle button which finally made separating
the CLIPBOARD-SELECTION buffer feasible. It's xsel!
xsel -b < file.in
xsel -b > file.out
and more, can be ...
read moreEveryone should care about vectorization. It's relatively easy for the compiler to do on it's own compared to stuff like auto-parallelisation, and can yield high performance gains on certain parts of the code. The win can be anything from 2x to 8x, depending on what data type we ...
read moreYou can use %! to pipe a buffer through a unix command.
I'm just about to finish reading the fantastic essay by Neal Stephanson entitled "In the Beginning was the Command Line" and I stumbled upon this quote:
read moreUnix is hard to learn. The process of learning it is one of multiple small epiphanies. Typically you are just on the verge ...
As I was editting a python script this morning, I acidentally entered K in
normal mode. Vim quickly hid and revelead a shell which contained two lines:
no Python documentation found for 'd'
Press ENTER or type command to continue
What is this sorcery, I thought to myself. I quickly ...
read moreI'm not usually a hater against Windows but this time I feel it's time to speak up. I wanted to install Windows 8 on my new laptop, but since it doesn't have a CD/DVD drive (and I wouldn't want it) I wanted to load the ...
read moreI want to share a python trick with you, that I have found to be very useful. And since I want to also find out how to embed gists, I decided to use this post as a testing ground.
I'm trying out the syntax highlighting extension to markdown available in pelican. Here it goes
#include <vector>
int main()
{
std::vector c = { 1, 2, 3 };
for (auto&& e : c) {
e -= 1;
}
return c[2];
}
Now let's see how this looks.
read moreThis is my first post on my pelican based website. I tried Jekyll and JekyllBootstrap first, but since I know neither ruby nor css, I couldn't customize my website at all. But with a python based generator, this shouldn't be an issue anymore. So: Hello, World to you!
read more