Symbols not found for architecture x86_64 Linker Issue
Why can templates only be implemented in the header file?
When do merchants start paying the actual value of items without bonus effects and perks? Is there a Stack Exchange site for both technical and behavioural interview questions? Where I could ask questions about, for example:   Sample questions and solutions, experiences, or seeking advice for interviews A place where I could ask interview questions and what the best way to answer it (not just a correct way or the most efficient).   What to do in a certain situation such as negotiation, unfair interviews, etc.   Experiences interviewing at so-and-so company. How to prepare files for rsync on a case insensitive filesystem? I am transferring a large number of files on a HFS+ filesystem.  The files are currently on ext2 partitions.  I have conflicts due to case insensitivity of the target partition (HFS+).  I want to identify the files that have duplicates filenames once they are in lower case, and delete them if they are actually duplicates.  I also found that I will have duplicate folder names if I convert everyhing to lower case. Basically these hard drives contain years of unsorted data, and I happen to have this problem with folder names too.   Does this seem reasonable:  find . -type f | while read f; do echo $f:l; done | sort | uniq -d    $f:l is ZSH for convert to lower case.  Now I want to keep only one instance of each file that have duplicates. How to do this efficiently ?  I do not want to find files with duplicate content, unless they have the same lower case filename. I will deal with duplicates later. How does a one-sided glass work? How does a  work? If seen from the outer side, we can see through thinking it is transparent, while if seen from the inside, the glass acts as a mirror. How? Definition of the Infinite Cartesian Product I'm a first time Linux user. My laptop wasn't connecting to the wifi so I followed the instructions from .  On typing sudo apt-get update after that, I got this error:  E: Type 'sudo' is not known on line 2 in source list /etc/apt/sources.list E: The list of sources could not be read.   What can I do? What to do with an additional answer which IMHO explains only a small portion of the question, while another answer explains more For the apple.stackexchange question  a 2nd answer was given, which relates to the question, but IMHO does not answer a majority portion of the question. Here some details:   The question is about, how to set the PATH variable in a unified manner. The  details how to change the file /etc/launch.conf. It is to note, that changing this file is needed for the overall answer. The author of the answer does make the valid point that, when he searched for, how to change /etc/launch.conf, the question came up. The  does not detail the change of /etc/launch.conf enough.   So, the general problem is: What to do when an additional answer explains only a small (but unique portion) of the question, while an earlier answer explains more (but not what the additional question explains).  Finally, I think I should note that I am the initial asker and poster of the 1st answer. Laplace transform of $1/t$ I know that electric current is the flow of electrons but electrons have a very slow drift speed (about 2mm/s). How is it that electric current reaches its destination at almost the speed of light? alias to take a parameter and exit after execution I have something like this:  &lt;div class="content"&gt;     &lt;a href="#"&gt;A&lt;/a&gt; &lt;/div&gt; &lt;div class="content"&gt;     &lt;a href="#"&gt;B&lt;/a&gt; &lt;/div&gt; &lt;div class="content"&gt;     &lt;a href="#"&gt;C&lt;/a&gt; &lt;/div&gt;   When one of these links is clicked, I want to perform the .hide() function on the links that are not clicked. I understand jQuery has the :not selector, but I can't figure out how to use it in this case because it is necessary that I select the links using $(".content a")  I want to do something like  $(".content a").click(function() {     $(".content a:not(this)").hide("slow"); });   but I can't figure out how to use the :not selector properly in this case. \selectcolormodel{gray} doesn't work for the duck hair, but it works for the other parts of the ducks, why?  \documentclass{ltugboat}  \usepackage{microtype}  \usepackage{graphicx}  \usepackage{ifthen} \newboolean{grayscale}    \setboolean{grayscale}{true}% for the black &amp; white version    %\setboolean{grayscale}{false}% for the colored version     \usepackage{tikzducks} \usetikzlibrary{positioning}  \newenvironment{mytikz}{%     \begin{tikzpicture}     \ifthenelse{\boolean{grayscale}}{\selectcolormodel{gray}}{}      }     {\end{tikzpicture}}  \usepackage{ifpdf}  \ifpdf  \usepackage[breaklinks,hidelinks]{hyperref}  \else \usepackage{url} \fi   \begin{document}      Why \textbackslash\texttt{selectcolormodel\string{gray\string}} does not work for the duck hair?      Black and white version:          \begin{mytikz}         \begin{scope}[xscale=-1]             \duck[longhair=pink]         \end{scope}         \begin{scope}[xshift=10pt]             \duck[crazyhair=orange]         \end{scope}     \end{mytikz}      Colored version:     \setboolean{grayscale}{false}      \begin{mytikz}         \begin{scope}[xscale=-1]             \duck[longhair=pink]         \end{scope}         \begin{scope}[xshift=10pt]             \duck[crazyhair=orange]         \end{scope}     \end{mytikz} \end{document} Interpolating functions returned by NDSolve do not plot Should we allow adding rep to bounties to extend their duration? There are a few variables here that I was thinking about:   Spend rep to extend a bounty for a certain amount of time Allow the rep spent to extend duration to add into the original bounty Create minimums on the amount necessary to extend dependent on how long it has been up   These are just ideas and can be tweaked as necessary, but the idea in whole is to encourage people to spend more on rep and avoid "wasted" rep because there wasn't a good answer to a question while minimizing the amount of possible abuse. This was part of the idea to spend a small amount of rep to extend duration without adding to the rep so that you wouldn't have to spend the whole amount over again for a couple more days.  The typical use case that I am thinking of is when you create a bounty and it still gets no attention. I think it would be cool if you could then add onto it to turn it into a higher bounty instead of having those points completely gone.  Possible abuses:   Keeping bounty questions alive for inappropriately long times. There is already an answer but the author does not want to award the bounty.   For 1, you can resolve this by increasing the amount necessary to keep a question alive exponentially similar to what is already in place. You could also halve the amount of extended duration per extension. For 2, this is a problem with the existing system as well, but the author does not have a positive incentive not to award the points since he himself still cannot get them back. The LOTR wiki  Eru Ilúvatar intervened in the history of Arda:   creating Elves and Men removing Aman from the spherical Earth resurrecting Gandalf making Gollum trip      In a letter written by Tolkien, he stated that Eru again intervened, this time in the Third Age, causing Gollum to trip and fall into the fires of Mount Doom while still holding the One Ring, thus destroying it.   Is this correct? If so, what letter is this, and exactly what did Tolkien say? Is there a way to get "people reached" sum across entire network for a user? The New Model profiles on Meta.SE (pretty big improvement!) have a section for "" stat.  Now, unless I'm much mistaken, that stat is specific to a given site on the network.  If that assumption is indeed correct, is there a way to find out the "People Reached" summary across 100% of the sites on the network for all your connected profiles? True or false: {{∅}} ⊂ {∅,{∅}} Alice has a secp256k1 key pair that she used some time ago when she communicated with Bob. Bob can no longer user secp256k1 but he only uses ed25519 instead.  Is there a secure algorithm that Bob can use to derive an ed25519 pubkey from original Alice's secp256k1 pub key and also Alice can derive the matching ed25519 private key from her original secp256k1 private key such that they can communicate securely via ed25519 encrypted messages?  Thanks! How to open terminal, split to 9 terminals and switch between them using one script? Calculate Euler equations of fluid dynamics without division?