One way to check whether a library is installed is to use ld, e.g. check that zlib is installed: ld -lzlib If library is installed you’ll get something like this: ld: warning: -arch not specified ld: could not find entry…
The trick is to use vmstat and look at the number for “wait on acknowledge”. vmstat -S m 1 100 Look under “cpu” and the “wa” column. If this number is high, it is bad. It should be zero. Some…
Warning: This is a description of how to create a OpenStreetMap WMS with GeoServer. It works fine up to the point where the layers published as an unstyled WMS. This is where I’ve not been able to produce a good…
Say you have a static JSON file sitting on a web server, e.g. mystaticfiles.com on Amazon S3 or a CDN. For the sake of argument, let’s imagine that it’s a configuration file. The contents of the file looks like this:…
If you have an ESRI Shapefile (.shp) that you want to reproject, you can use ogr2ogr ogr2ogr -t_srs newfile.shp oldfile.shp The EPSG code could be for instance epsg:28532.
Warning: This is not the hardest way to create a word cloud from pdf-documents, but it’s up there. Say you have directory containing pdf documents: $ ls a.pdf b.pdf c.pdf …
Include the packages. The blindtext package is just an easy way to type Lorem ipsum etc. \usepackage{multicol} \usepackage{blindtext} Make a two column section of a page. \begin{multicols}{2}[\textbf{Example for a two column text}] \blindtext \end{multicols}
The following recipe should work for any OS. Download and install VirtualBox Download OpenSolaris image Start VM If you want to try an other image than OpenSolaris, you can find many others images (CentOS, FreeBSD, etc) here:
I’m half way through the Part-time parliament on Paxos article by Leslie Lamport. It is an article that describes a three-phase consensus protocol by telling a story of a (fictional) parliement on the greek island of Paxos, complete with fat…
SYSTEM_PROFILER Show a very long list of details about your machine and kernel (verbose output) system_profiler