"while read -r LINE; do" is replacing multiple spaces with a single space
Why does my shell script choke on whitespace or other special characters?
Find the summation of given expression: $\sum_{k=1}^n k^3\binom nk$ I am trying to solve the following question which is Ex3 from Arthur Engel, Problem Solving strategies. Here is the question: $\sum_{k=1}^n k^3 {n \choose k}$ and asks to find the sum. I am sincerely having a hard time trying to figure out how to solve it and get $n^2 (n+3)(2)^{n-3}$. I would really appreciate if someone could show the step-by-step process. Thank you! If photons have no mass, how can they have momentum? The new ask page is now live on the network! Work in ArcGlobe and I want to calculate the coordinates of the globe latitude and longitude, but the coordinates from the mouse click is read from the screen, not the globe, because when I clicked on the corner of the screen it shows me the coordinates 0,0. How can I make it so that coordinates read with globe and not with the screen? import arcpy import pythonaddins  class ToolClass2(object):     &quot;&quot;&quot;Implementation for coord_addin.tool (Tool)&quot;&quot;&quot;     def __init__(self):         self.enabled = True         self.shape = &quot;NONE&quot; # Can set to &quot;Line&quot;, &quot;Circle&quot; or &quot;Rectangle&quot; for interactive shape drawing and to activate the onLine/Polygon/Circle event sinks.     def onMouseDown(self, x, y, button, shift):         pythonaddins.MessageBox(&quot;Long&quot; + &quot; &quot; + str(x) + '\n'+ &quot;Lat&quot;+ &quot; &quot; + str(y), 'Coordinates', 0)         pass     def onMouseDownMap(self, x, y, button, shift):         #pythonaddins.MessageBox(&quot;Long&quot; + &quot; &quot; + str(x) + '\n'+ &quot;Lat&quot;+ &quot; &quot; + str(y), 'Coordinates', 0)         pass     def onMouseUp(self, x, y, button, shift):         pass     def onMouseUpMap(self, x, y, button, shift):         pass     def onMouseMove(self, x, y, button, shift):         pass     def onMouseMoveMap(self, x, y, button, shift):         pass     def onDblClick(self):         pass     def onKeyDown(self, keycode, shift):         pass     def onKeyUp(self, keycode, shift):         pass     def deactivate(self):         pass     def onCircle(self, circle_geometry):         pass     def onLine(self, line_geometry):         pass     def onRectangle(self, rectangle_geometry):         pass Is it possible to run Drush without root? I run a Linux server that is administered by a friend of mine, and at the moment I work with Filezilla.  I've heard that Drush is a trivial installation: it seems to require no configuration and work out of the box.   However, it looks for configuration in several places:     Drush installation directory,  the home directory (as .drushrc.php),    root directory of a Drupal installation, and  site directory of a   Drupal installation.  Since the configuration files are just PHP   scripts, they can  contain any PHP code that you would like to have   executed on startup of Drush.  one could for instance call ini_set()   to set the value of a PHP configuration option.   and the configuration file /opt/drush/drushrc.php with following content:    # Allow Drush to use 128 MB of memory. Use -1 for no limit. ini_set('memory_limit', '128M');   I see this is necessary because PHP's default is too low, but I'm not sure if I need higher-level privileges because of it.  Do I have to have root-level permissions on the server, or am I able to work with Drush without them?   Update:  As far as i understand this, i only have to ask my admin to get some more privileges (permissions)Note according to BetaRides answer i need to have more than only the access-data that the FileZilla needs - that are provided for the filezilla! Guess so - but i don not need root-permissions.  btw - i have secure-shell-access (ssh2 access) guess that this is enough -With that i can setup a sftp-connection to the server with filezilla just lemme know - if i can use the exactly same data for the shell access (with the command line tool=?!= Do I need a transit visa in Zurich on the way to India? I am travelling from US to India, with an Indian passport but expired F1 visa and going there to get my H1B visa stamping. I have a stop at Zurich for 2 hours while flying to India. Do I need a transit visa for my trip? Why do some tests have a (nonzero) minimum score? I have an object with two solidify modifiers added, but the modifiers are not visible in the view pane. How can I see the applied modifiers. This is in Blender 2.91 Continuous function positive at a point is positive in a neighborhood of that point Pretty much the problem asks if a function is continuous at the point $c$ and $f(c) &gt; 0$ then there exists a $d &gt; 0$ such that $\forall x$, $f(x) &gt; 0$ with $|x-c| &lt; d$.   I can understand what the problem means. That if a function is positive at a point then there is another point that's really close that'll also be positive. I can not prove this in a formal way though. I've tried using the intermediate value theorem and I do not know hot to implement it. Any ideas? Can someone please give me a tip how to show that for distinct prime $p,q$ that $\mathbb{Q}(\sqrt{p},\sqrt[3]{q})=\mathbb{Q}(\sqrt{p}\sqrt[3]{q})$ and how to find the minimal polynomial of $\sqrt{p}\sqrt[3]{q}$ over $\mathbb{Q}$ ? Recently I have installed an older version of Ubuntu on my old machine. Whenever I try to install any software, I get an error saying it couldn't be found:  $ sudo apt-get install vlc Reading package lists... Done                Building dependency tree        Reading state information... Done     E: Couldn't find package vlc Can $R \times R$ be isomorphic to $R$ as rings? Importing a material from blender to unity Chrome address bar no longer shows protocol or www subdomain A couple of days ago I noticed that for all websites, chrome omits from the address bar the protocol and the subdomain if it is www. My co-workers report that they are not seeing this. Chrome version is 67.0.3396.87.  For example, if I type into the address bar https://www.google.com (without the quotes), Chrome immediately displays the chip "Secure" followed by google.com. See attached screenshots.      I have looked in vain for Chrome settings that affect this, plus the chrome://flags page and chrome://net-internals page.  I did not do anything consciously to make this change.  Any ideas?  EDIT: Suggestion from MrWhite that Ominbox UI Hide Stead-State URL Scheme and Trivial Subdomains had become enabled: good suggestion, except that the setting is still at “Default.” See screenshot:    However, as a shot in the dark, I am going to play with the setting to see what happens.  First I set it to “Disabled.” That restored the previous behavior of the address bar, which is to not to hide the protocol and “trivial subdomains.” Then I changed it back to “Default,” and it was hiding them again. One would suspect that somehow the default has been changed, except that co-workers are not reporting this issue.  Oh, well. I’ll just leave it as Disabled for now.  I would be ready to accept the answer from MrWhite, because it provides a workaround. Yet will leave it open for a bit longer, because it does not really answer why this behavior has changed, and why it has to be overridden.  EDIT 2: Chrome version is 67.0.3396.87. Why do the Localization of a Ring This question may be a bit vague, but neverthless, i would like to see an answer. Wikipedia tells me that:   In abstract algebra, localization is a systematic method of adding multiplicative inverses to a ring.   It is clear that for integral domains, we have the Field of Fractions, and we work on it. It's obvious that a Field has multiplicative inverses. Now if we consider any arbitrary ring $R$, by the definition of localization, it means that we are adding multiplicative inverses to $R$ thereby wanting $R$ to be a division ring or a field. My question, why is it so important to look at this concept of Localization. Or how would the theory look like if we never had the concept of Localization. Derivative of $(y-XB)' h(y-XB)$ with respect to $B$ How to convince airport security that I am not dangerous when having metallic parts in my body? I had an operation some time ago and now I have small screws in my shoulder which will not be removed anymore. When I decided to fly for vacation, I supposed that these will may bring me into trouble at the airport when going through the metal detector.  So I asked my doctor and at the hospital if there is any kind of "passport" or something similar which confirms the screws in my shoulder so that I do not get into many problems. Unfortunately, they told me such things do only exist if you get a new knee or something, not if you just have a few screws in your body.  When I flew from Vienna to Amsterdam and back, my fears were confirmed: The security staff inspected me very precise, and I had to explain them my story. Thank god I have some scars left so they believed me!  However this is not a permanent solution for the future. Is there any international "passport" which my doctor and hospital do not know about? If not, what else are my possibilities?  I am not that afraid when travelling within the EU, however I fear that this situation might get quite dangerous when I'm in other countries... How do I automatically restart docky after a crash? How to watch live youtube stream using vlc? Is it possible for now to watch live youtube video streams using vlc? I just don't want to use flash player. I know that vlc can play youtube videos using link for the page where that video is located, but how about live youtube videos? Conditional expectation of $X$ given $\sin(X)$