I was setting up a cloud server and saw that I accidentally added a folder named ^[[4~ (with escape code). I want to see what is inside and if that was just a mistake then remove that directory. However I cannot cd nor ls the contents. I tried finding out the escape code so that I could enter a command like cd \x1b[30m; and hope that it would get me in the directory.  What if I was to cd or remove by searching for the first directory listed with ls. Would that be possible? Because when I do a ls |grep 4 two results come up and one of them is the one I'm trying to access.  Either finding out the folder name in escape string or changing the directory to the first directory ls finds might be a solution here. How can I approach this problem?
I have a stubborn folder that someone must have created accidentally and that has persisted all this time. I can see it with:  # find /var/www/html -maxdepth 1 -type d   which gives me:  /var/www/html /var/www/html/files /var/www/html/.?   unfortunately the question mark there is not the actual character ?, it merely seems to denote that there is no proper glyph and/or translation for that character. So something like rmdir is out of the question. My system has UTF-8 as the default locale as so many modern Ubuntu systems, but admittedly the folder in question may have originated on a RHEL or CentOS box (tared up and unpacked).  # env|grep LANG LANG=en_US.UTF-8   When trying to cd .\? (as mentioned before it is not actually ?) I get auto-corrected to . by bash and actually end up in /var/www/html/. for some reason. Now if I can't "name" this folder usefully, I cannot access it in any way. How can I get rid of it without putting the whole system in jeopardy?  Now I installed detox already but that only seems to act on files, not folders, according to its documentation and besides it still requires that I be able to name the object somehow to do something with it.
Unmarshal a single element list fails Isolate OSX Dock per Space How can I make it so that each space has its own isolated dock?  Basically what I'm looking for is:   The dock in one space should not show the icon of an app that was open in another space. If I have the same program open in two different spaces, clicking on the icon in one space should not go to the app in the other space.   Is this possible natively, or with a third party program? What is "angle of view" in photography? What is this electronics symbol (four triangles?) When is it better to use String.Format vs string concatenation? How to install Ubuntu on portable external Hard Drive? Java; String replace (using regular expressions)? As part of a project for school, I need to replace a string from the form:  5 * x^3 - 6 * x^1 + 1   to something like:  5x&lt;sup&gt;3&lt;/sup&gt; - 6x&lt;sup&gt;1&lt;/sup&gt; + 1   I believe this can be done with regular expressions, but I don't know how to do it yet.  Can you lend me a hand?   P.S. The actual assignment is to implement a Polynomial Processing Java application, and I'm using this to pass polynomial.toString() from the model to the view, and I want do display it using html tags in a pretty way. Does existence of magnetic monopole break covariant form of Maxwell’s equations for potentials? Absence of magnetic charges is reflected in one of Maxwell's fundamental equations: $$\operatorname{div} \vec B = 0. \tag1$$ This equation allows us to introducte concept of vector potential: $$\vec B = \operatorname{rot} \vec A.$$ Using this concept, it is possible to express Maxwell's equations in a graceful symmetric form: $$\nabla^2 \vec A - \frac{1}{c^2}\frac{\partial^2 \vec A}{\partial t^2} = - \frac{\vec j}{\epsilon_0 c^2}, \tag2$$ $$ \nabla^2 \phi -\frac{1}{c^2}\frac{\partial^2 \phi}{\partial t^2} = - \frac{\rho}{\epsilon_0}. \tag3 $$  Noticing, that vector $\vec A$ and scalar $\phi$ potentials, as well as electric current density $\vec j$ and charge density $\rho$, form a 4-vector in Minkovsky space-time. Therefore, Maxwell's equations can be expressed in a covariant form, using d'Alembertian: $$\nabla_{\mu}\nabla^{\mu} A_{\nu} = \frac{j_{\nu}}{\epsilon_0}. \tag4$$  If magnetic monopols exist, Maxwell's equation $(1)$ will look as: $$\operatorname{div} \vec B = \mu_0 c \rho_{\mathrm{magnet}}.$$  As the divergence of $\vec{B}$ isn't equal to zero, it impossible to introduce concept of vector potential. Thus, the equation in the form of $(4)$ will not be possible to express. Looking at the questions and answer to these two questions.  &amp;  and neither mentions the longevity of magic. I recall several instances of magic failing to last; the money that was spread at the  and the broken  on.  If I recall correctly when Voldemort died, the curses on several people were lifted.  I don't recall if any other spells fell apart with his death.  Is there any canon evidence on the the length of time a spell will live? Forcing a SimpleXML Object to a string, regardless of context Why does Microsoft Windows' performance appear to degrade over time? Windows XP/2003 and earlier (can't attest to Windows Vista, but I suspect it's the same) all appear to become more sluggish over time as applications are installed and uninstalled.  This is not a scientifically tested observation, but more of a learned-through-experience piece of wisdom.  (I've always suspected the registry as being behind the issue.)  Is there any concrete evidence of this degradation occurring, or it just an invalid perception of mine? How do I show that $\sum_{cyc} \frac {a^6}{b^2 + c^2} \ge \frac {abc(a + b + c)}2?$ Let $a, b, c$ be positive real numbers, show that  $$\frac {a^6}{b^2 + c^2} + \frac {b^6}{c^2 + a^2} + \frac {c^6}{a^2 + b^2} \ge \frac {abc(a + b + c)}2.$$  I think this is likely to turn out to be proved by Hölder, but I can't see how. Any hints will be appreciated. Is it possible to kill Ulfric after joining the Stormcloaks? So I've been thinking if it's possible to join the Stormcloaks only to realize Ulfric's an ass and kill him after that at some point of the game (I know you can't just go and kill him at first because he's an important NPC for the main story quests).  I don't want to join the Empire and - in my mind - what would make sense in my character's storyline would be him joining the Stormcloaks at first (because of how the game starts and my character being a Nord and having escaped with Ralof), but later realizing how Ulfric is only after power and how his fight against the Empire might even benefit the Altmers by weakening both forces (Empire and Rebellion). His Talos talk is just an excuse for his actions, as I see it. I really don't like this guy (he's a crazy racist who would do anything for power), but I also don't like what the Empire has become.  Please note that I don't really want spoilers about the plot, I just want to know if it is possible to challenge Ulfric to one-on-one combat "in the Old Nord Way" or just take the Rebellion for myself by assassinating him. Is it ever a good idea to close credit cards? I have a bunch of credit cards with no balance, while others have fairly high balances. I'd like to close the 0 balance cards, but I know that will reduce my overall balance and hurt my credit rating, since my ratios of used to unused credit will rise.  Is it ever a good idea to close credit cards? Calculate distance between 2 GPS coordinates How do I calculate distance between two GPS coordinates (using latitude and longitude)? Why does bool(xml.etree.ElementTree.Element) evaluate to False? How to escape braces (curly brackets) in a format string in .NET I have to compute this integral $$\int_{0}^{\infty} \frac{dt}{1+t^4}$$ to solve a problem in a homework. I have tried in many ways, but I'm stuck. A search in the web reveals me that it can be do it by methods of complex analysis. But I have not taken this course yet. Thanks for any help. Moment generating functions/ Characteristic functions of $X,Y$ factor implies $X,Y$ independent. This is solely a reference request. I have heard a few versions of the following theorem:     If the joint moment generating function $\mathbb{E}[e^{uX+vY}] = \mathbb{E}[e^{uX}]\mathbb{E}[e^{vY}]$ whenever the expectations are finite, then $X,Y$ are independent.   And there is a similar version for characteristic functions. Could anyone provide me a serious reference which proves one or both of these theorems? Calculating peaks in DEM using GRASS