I was looking through some documentations for my university task and noticed that all of the syscalls there are followed by (2), like execv(2), fork(2) or fcntl(2). What do they represent?
For example: man(1), find(3), updatedb(2)?   What do the numbers in parentheses (Brit. "brackets") mean?
Creating fishnet grid with specified rotation angle in ArcGIS Desktop? I'm working on this project and I need a grid with a certain rotation, at about 60 degrees, for example.  Starting from that I need to make a block of 20mx50m, and the last thing is that inside each block there must be a small set of sub-blocks.   The result is this:    Of course it's been done manually, but I was thinking of a way of making it done automatically because I must do 30 blocks like this one, maybe more, and it is consuming a lot of my time. Formatting OGR VRT file to convert CSV to KML? I am attempting to get a nice KML for simple review of POI/geocoding from a CSV. I a using ogr2ogr and a VRT. You can see the VRT file below, with two attempts to get this right.  Basically, the issue is using ogr2ogr -f KML ... with the VRT w/o renaming results in a lot of "SimpleData" tags in the KML.   I'd like to get some CSV fields as the KML Placemark "Name" and "Description", concatenated fields, actually. -dsco NameField=RegionName option in ogr2ogr, but I don't see a way to concatenate fields into name, e.g Street, City, State..  In the .vrt below, the SrcSQL field results in no records. It does open, but with layer info. The Field tag (when not commented out) does result all records with in the new alias, but the "name" is the only field that comes through, it drops all other fields.  Is there a way to concatenate fields using ?  Of course, perhaps ogr is not capable of concatenation ...  &lt;OGRVRTDataSource&gt;     &lt;OGRVRTLayer name="roofing-poi2"&gt;         &lt;SrcDataSource&gt;roofing-poi2.csv&lt;/SrcDataSource&gt;         &lt;GeometryType&gt;wkbPoint&lt;/GeometryType&gt;         &lt;LayerSRS&gt;WGS84&lt;/LayerSRS&gt;         &lt;GeometryField encoding="PointFromColumns" x="Longitude" y="Latitude"/&gt; &lt;!--         &lt;Field src="StreetAddress" name="name" /&gt; --&gt;         &lt;SrcSQL&gt;SELECT StreetAddress as name&lt;/SrcSQL&gt;     &lt;/OGRVRTLayer&gt; &lt;/OGRVRTDataSource&gt; Making pen and ink corrections on a UK visa form? After printing out a UK visa form, can you cross out planned arrival date with a pen and write a new one? I have created a model which requires some faces to be dual sided.  I intend to import this model into Unity. Reading about this, it seems that the recommendation is to duplicate the polygons and then flip the normals.  What I have done so far is simply to duplicate the all of the relevant faces using Shift+D and then flip the normals. I don't like this method though as it hampers any future alterations to the model itself.  What is the best way of doing this? Cut points and connected space What's the fastest way to count the number of keys/properties of an object?  It it possible to do this without iterating over the object?  i.e. without doing  var count = 0; for (k in myobj) if (myobj.hasOwnProperty(k)) count++;   (Firefox did provide a magic __count__ property, but this was removed somewhere around version 4.) A large number of variants of this question were already asked here, including these - , , which are close, but none seem to answer my question. Assume that $n$ balls are thrown randomly and independently into $k$ bins.  What is the probability of finding $x$ empty bins? What is the expectation of the number of empty bins? What is this mark over the question When I open a site I see a mark over a question.See screen shot.  When I open the question mark is not remove.It still appear.    is this bug or? How can I sum two values and store the result in other variable? In LaTeX2e,how can I sum two values and assign them to other variable?  I want to compute something like:   var=\textwidth - 1cm    And if both were constants:   var=1+1 How to get reflections from 3D to show up on real images Andrew Price released a nice tutorial on how to nicely put 3D objects on top of a real image:   I have seen images, such as this:  which have 3D elements over images and have actual reflections from the object showing up on the wet asphalt.  How can this effect be achieved using render passes (or any other way)?  Here is another example (from ): Random bits of my chat die and come back to life during the day I am working in Illustrator (15.0.2 (CS5) or 16.0.0 (CS6)) and when I try to move objects small distances, they snap to the nearest two pixels on some invisible grid. I can't find anything in the preferences. Here are some screen shots: Multiple addresses in JSON-LD Schema.org Sum with parameter convergence What is a glue record? This is a  about DNS glue records.   What exactly (but briefly) is a DNS glue record?  Why are they needed and how do they work? mkdir error: no such file or directory on a linux machine running CENTOS v 7.8.2003 I am in a directory Neutrinos I now do  mkdir /pionloop/ this works. I then go to into this new directory pionloop and do mkdir /E_0.3 and this works as well. I thus have as a result a directory Neutrinos/pionloop/E_0.3.  Now, starting in Neutrinos I want to do this in one command and therefore do mkdir /pionloop/E_0.3 and get: `mkdir: cannot create directory ‘/pionloop/E_3.0’: No such file or directory  What is going wrong here?? How to remove zsh alias? Copy specific file type keeping the folder structure Why can't I destroy or place blocks? I'm playing on a Survival world with cheats on, "easy" difficulty, and at night in-game. I didn't have a sword or anything to make a sword with, and I was starving, so I switched to Creative to give myself a stack of food and a bed to set my spawn point. When I switched back to Survival, I couldn't destroy or place blocks. I'm on single player, and my Internet is fine, and I can destroy blocks still if I switch to creative. I've tried resetting the button one, and reloading the map, and it still doesn't work. I've even tried deleting everything I gave myself in Creative. This happened before on a different world and I ended up deleting it.  This only happens on this world. How do I fix it?  If I know I'm in the correct game mode, what else can cause this?  Are there different causes in multiplayer? Here is what it looks like in Blender Render (Not Cycles).   This is how I set it up.   Basically, I'm trying to export it, but it's not including the &quot;Freestyle&quot; lines. When I open up the .dae file in Finder, it looks like this:   What is wrong here? I want it to be exported (COLLIDA .dae) with the black outline. I'm seeming to think that maybe the &quot;Freestyle&quot; is only for the Blender Render. Am I right? How would I go about getting the black outline included in my exported model? Is it an export setting I have to tick? Thanks for any helpful answers.