Removing unwanted characters from folder names
How to remove illegal characters from path and filenames?
How to raise a complex number to the power of another complex number? How do I calculate the outcome of taking one complex number to the power of another, ie  $\displaystyle {(a + bi)}^{(c + di)}$? Electromagnetic waves in vacuum If there is no source then also there is electromagnetic waves described by Maxwell equation. how if there is no source then existence of EM waves. What gives energy to this EM  waves. Is it vacuum fluctuation or something else? Array List count to users I usually prefer to fix a Linux system than to reinstall from scratch. My computers have seen many distribution upgrades and a list of PPAs or third-party repositories. APT usually makes sure that everything works in the end. However, the fact that the package manager thinks that all required packages are 'installed' does not guarantee that all the files are present on the file system.  Such a such situation may occur if you have to work-around dependency problems with dpkg --force-*. One could also reproduce such a situation by deleting a file from /usr as root.  Is there a simple way to verify whether all files belonging to an installed package are present?  If a such a problem package is found, aptitude reinstall fixes the problem. Why does printf not flush after the call unless a newline is in the format string? If $f$ is bounded and $\lim_{x \to c} g(x) = 0$, then $\lim_{x \to c}g(x)f(x) = 0$ Is [Its'] a word? (Note the apostrophe at the end.) I just had a strange flashback to a conversation I had when I was in high school, with a man who was regarded by many members of a particular online community as having an impressive degree of knowledge of the English language.  The conversation centered on a claim this man made that I found very difficult to accept. I had made some remark involving the difference between it's and its (a distinction which I trust is quite well-known to the majority of users on this site), to which he had contributed, mostly phrased as an amusing aside, that there was one more word I hadn't mentioned: its', with the apostrophe at the end.  I originally thought he might have been joking, but we ended up debating this rather fervently. I seem to recall that I kept demanding he use the word in an example sentence, but he either could not or refused to do so. Yet he maintained that it is a word.  Is this true? I must concede I haven't put a lot of thought into it just now; but at the time, I was perplexed by the very suggestion that it could be a word (what could it mean?), and at the moment I can't really think of any scenario where it would make any sense. Installed 14.04 on a non-PAE (Pentium-M), but now I can't update ("This kernel does not support a non-PAE CPU.") Here is what I'm looking at. This isn't my computer. I repair PC's and I had an end user with this low powered laptop running XP so I decided to let him try out lubuntu. The install went smoothly with the non-PAE boot switch, but now I can't update anything. I'd rather not have to format and start over since he's spent time configuring his system. Any tips would be appreciated. I tried sudo apt-get clean, sudo apt-get install -f, sudo apt-get update. No go.  Also his touchpad stopped working, the wireless stopped working, the keyboard works in firefox but not chrome, and in firefox the address bar sometimes turns black and gray for some reason. I was hoping the update would help address some of this stuff.  Here's the message I get trying to update:  Get:1 http://us.archive.ubuntu.com/ubuntu/ trusty-proposed/main linux-image-3.13.0-26-generic i386 3.13.0-26.48 [14.6 MB] Get:2 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main linux-image-3.13.0-24-generic i386 3.13.0-24.47 [14.6 MB] Fetched 29.2 MB in 2min 19s (208 kB/s)                                          (Reading database ... 169286 files and directories currently installed.) Preparing to unpack .../linux-image-3.13.0-26-generic_3.13.0-26.48_i386.deb ... This kernel does not support a non-PAE CPU. dpkg: error processing archive /var/cache/apt/archives/linux-image-3.13.0-26-generic_3.13.0-26.48_i386.deb (--unpack):  subprocess new pre-installation script returned error exit status 1 Examining /etc/kernel/postrm.d . run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.13.0-26-generic /boot/vmlinuz-3.13.0-26-generic run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.13.0-26-generic /boot/vmlinuz-3.13.0-26-generic Preparing to unpack .../linux-image-3.13.0-24-generic_3.13.0-24.47_i386.deb ... This kernel does not support a non-PAE CPU. dpkg: error processing archive /var/cache/apt/archives/linux-image-3.13.0-24-generic_3.13.0-24.47_i386.deb (--unpack):  subprocess new pre-installation script returned error exit status 1 Examining /etc/kernel/postrm.d . run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.13.0-24-generic /boot/vmlinuz-3.13.0-24-generic run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.13.0-24-generic /boot/vmlinuz-3.13.0-24-generic Errors were encountered while processing:  /var/cache/apt/archives/linux-image-3.13.0-26-generic_3.13.0-26.48_i386.deb  /var/cache/apt/archives/linux-image-3.13.0-24-generic_3.13.0-24.47_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1) Changing permissions on serial port I'm using the Arduino IDE in Ubuntu, and am having issues with the serial port. It has worked in the past, but for reasons that may be unnecesary, I felt the need to change the ownership of some of the files from root ownership to my users ownership.  This made the IDE work correctly, but I lost the ability to use the correct serial port.  In the dev folder, the port I need is listed as permission 166. Someone (who is no longer in the area to help me) swapped the permissions to 666, which made it all work gloriously.  However, it reverted back as soon as I restarted my computer, and if I now try to use the command:  sudo chmod 666 ttyACM0   nothing happens. No error messages, but no permission change either.    How can I change it, and how can I get it to change permanently.  I apologize if this question is overly simplistic or unclear, I'm an ubuntu noob, and I wouldn't begrudge feedback! I have a map a at the link below:    I added one of my GeoServer WMS layers to the map, now I try to add the attributes window pop up on click. I found to examples on the OpenLayers 3 homepage, but I cannot put together a working code...      Is there any chance to have a working sample somewhere? What is the word for the order of succession in which son assumes the throne after father? It can be any son-younger son after elder son after father. Also, what can be the term for only a single family in power? Please answer. Additional Boxes - Criteria, Longevity, Manipulability This feature has existed for a while (I'm not sure since when exactly), but I'm mainly interested in the Gen VI implementation (hence the tag).  Usually, at the start of a game, you have some number of Boxes available. In B/W, those were 8, in X/Y I think it was 15. Under certain conditions though, you receive additional Boxes that just appear at the end of your current Boxes list. Which brings me to Part 1 of my question:     1) What are the exact conditions for additional Boxes to appear and do you always get 8 additional Boxes? (Using Pokemon Bank reveals that in X/Y, the maximum number of Boxes is 31, which I have experienced to be unlocked in 2 steps of 8 Boxes each.)   Since I'm a person who really likes to order and organize stuff, my Boxes have names and are used to categorize my Pokemon. This results in some Boxes ending up empty for a while most of the time. So here's to     2) Do additional Boxes you receive stay forever or do they disappear if the conditions for them are no longer met?      3) If they disappear, is there a way (such as renaming or putting any Pokemon in the last Box) to make them stay no matter what, even if you released all your other Pokemon? Difference between float and decimal data type Direction arrows on a circle I would like to plot circle (or another curve) with positive direction (and show it wit arrows).  This plots the circle  \documentclass{article} \usepackage{tikz} \RequirePackage{pgfplots} \usetikzlibrary{shadows} \usetikzlibrary{shapes} \usetikzlibrary{decorations} \usepackage{verbatim} \usepackage[active,tightpage]{preview} \PreviewEnvironment{tikzpicture} \setlength\PreviewBorder{5pt} \begin{document} \begin{tikzpicture}     \begin{axis}[             xmin=-1.5,xmax=2.5,ymin=-1.5,ymax=1.5,             axis lines=center,             ticks=none,             unit vector ratio*=1 1 1,            ]                   \addplot [very thick, smooth, domain=(0:2*pi)] ({1.+cos(deg(x))},{sin(deg(x))});        \addplot[only marks,mark=*] coordinates{(1,0)};         \end{axis} \end{tikzpicture} \end{document}   And I want to add arrows like that    Would you advise me how to add such arrows? If banks offer a fixed rate lower than the variable rate, is that an indication interest rates may head down? This is one of the major banks in Australia:   At present time, the variable rate is 7.80% but the fixed rate is 6.99% for one year.  And it seems most banks in Australia, if you fix the rate (at the moment), you will get a lower rate.  Is this an indication that in the eyes of the banks, that they believe the interest rates are going to down? I just ask because it seems most people in the media think the rates are going up and they've risen about 6 times in a row now.  Could it be that the banks are secretly preparing for rates to drop? How does Lucio's aura work vertically? If I play Lucio, can I heal the teammates located at a different height? (roof, upstairs, hovering Pharah... )  In other word is that aura strictly horizontal? Or does it work more like a bubble like Winston's barrier?  If it's horizontal, does it require Line Of Sight or not? (will I heal a nearby ally right behind a wall?) Do spellcasters know when a dismissable spell has been broken? Do spell casters know how long their spells are active, and can they tell at a glance?  Specifically lets talk about , as I know its a permanent duration and dismissable. Does the spell caster who put someone under this spell know how long it is active? Could they tell automatically just by seeing the person (without any clues like them walking in a maze without difficulty or reacting to a sound)? So could they tell if someone has broken the spell they cast? libsensors5 or libsensors-config upgrade problem Is Tolkien prejudiced against the East? In Tolkien's The Lord of the Rings series, there are generally two groups of Men. The good ones are coming from the West (Dúnedain, Men of the West), and the bad ones, the Easterlings, mostly fight under Morgoth and Sauron.  Why was this so? The buttons on the modal dialog box for leaving a page with unsaved changes are confusing If you are editing a question and decide to close the tab/window/whatever, SO opens up a dialog box asking you if you are sure. The buttons for this dialog are "OK" and "Cancel". However, what these map to is not entirely obvious. It would make more sense to change them to action words describing what they do. For example, it could be "Close this Question" and "Stay Here". This would eliminate the need to explain which button does what in the dialog itself and require less work from the user.