Didn't used to or didn't use to?
What's the negation of "I used to be"? Surely not "I didn't used to be"?
Show that $8 \mid (a^2-b^2)$ for $a$ and $b$ both odd How can I install packages without starting their associated services? As you're probably aware, by default when you install a package on a Debian or Ubuntu based system, if the package contains a service, that service will generally be enabled and started automatically when you install the package.  This is a problem for me.  I've found myself needing to manage templates for building LXC containers. There are several containers, each corresponding to a Debian or Ubuntu release. (There are also Red Hat-based containers, but they aren't relevant here.)  /var/lib/libvirt/filesystems/debian6_template /var/lib/libvirt/filesystems/debian7_template /var/lib/libvirt/filesystems/ubuntu1004_template /var/lib/libvirt/filesystems/ubuntu1204_template   Occasionally I will find that the templates have a missing package or need some other change, so I will chroot into them to install the package. Unfortunately when I do that, I wind up with several copies of the package's service running!  By way of example, I found the templates didn't have a syslog daemon, so I installed one:  for template in /var/lib/libvirt/filesystems/{debian,ubuntu}*_template; do     chroot $template apt-get install rsyslog done   And promptly wound up with four copies of rsyslog running. Not to mention two copies of exim4. Oops!    I read somewhere (though I can't find it again now) that it's not supposed to start services when running in a chroot, but that clearly isn't happening here.  One potentially viable  calls for temporarily replacing the various commands which actually start services, such as start-stop-daemon and initctl, though this is a lot more work than I really wanted to do. If I have no other choice, though...  The ideal solution here would be for Debian-based systems to stop doing this crap, but failing that, perhaps an obscure or undocumented command line option for apt-get?  In case it wasn't clear, I really want to keep anything related to managing the templates outside the templates, if possible. What Happened to The Latex Symbols In the Libreoffice-Texmaths Equation Editor? How do we prove that this set is not manifold? Open Windows Terminal as admin with WIN+R I use shortcut  +R to run Windows Terminal [wt], but I cannot run it as Admin, which causes problems when I install something via choco.   To open it as Admin, I have to:  Press  > Right-click Terminal > More > Run as Admin  > ◀ > ENTER Some solutions say to use the following, but it can only open powershell, not wt:  +X > A > ◀ > ENTER While  say to use the following, but it also doesn't work:  +R > SHIFT+CTRL+ENTER   How do I open Windows Terminal as Admin via a command? Pygame: Is there any easy way to find the letter/number of ANY alphanumeric pressed? I try to color the page numbers of my table of contents.  I'm using the package hyperref along with the options :  \hypersetup{   colorlinks,   linkcolor=wine-stain % custom color }      Here's the output :       The numbers remain black..  What should I do so the numbers become the same color as defined for the sections ?  I tried to \color{wine-stain}{\tableofcontents} but still that doesn't work since "Contents" is also colorized and the subsection numbers are remaining black. How to bond/connect wires to neodymium magnets? After reading , I learned it is not advisable to solder a wire to neodymium magnets.  After more reading I found  post describing the use of conductive epoxy to bond electrical wires to neodymium magnets, a very messy process which takes several hours of waiting.  I want to ask this community if they have or suggest better methods to bond/connect a wire to a neodymium magnet to act as a conductive connection? Time limited and band limited signal Solve $\sin(z) = z$ in complex numbers Show that $\sin(z) = z$ has infinitely many solutions in complex numbers. Little Picard theorem should help, but using big Picard theorem is undesirable. Thanks a lot! How to interpret these acf and pacf plots Following are acf and pacf plots of a monthly data series. The second plot is acf with ci.type='ma':    The persistence of high values in acf plot probably represent a long term positive trend. The question is if this represent seasonal variation?  I tried to see different sites on this topic but I am not sure if these plots show seasonality.           Edit: following is the graph for lag upto 60:     Following are plots of diff(my_series):     And upto lag 60:     Edit: This data is from:  Here the contributors did not consider acf and pacf plot of original or differenced series worth mentioning (so it must not be important). Only acf/pacf plots of residuals was referred to in a couple of places. Add time restriction in ArcGIS Network Analyst I'm trying to use train tracks as a network in ArcGIS Network Analyst.   We are trying to create a model for security agents on board our trains and we'd like to optimize their daily "route". For now, it's all made by hand.   My approach is to take our gtfs data and create a network using stop times to determine when the train segment is "traversable". When there's a train on the segment, it's open, if not, it's restricted.   The problem is I can't set a restriction based on time in Network Analyst (or wasn't able to). I would like to be able to say by a formula or script than you can take that segment only from 7:03 AM to 7:10 AM for example.  Is it possible?  Thanks! How to pass parameters to function in a bash script? I'd like to write a function that I can call from a script with many different variables. For some reasons I'm having a lot of trouble doing this. Examples I've read always just use a global variable but that wouldn't make my code much more readable as far as I can see.  Intended usage example:  #!/bin/bash #myscript.sh var1=$1 var2=$2 var3=$3 var4=$4  add(){ result=$para1 + $para2 }  add $var1 $var2 add $var3 $var4 # end of the script  ./myscript.sh 1 2 3 4   I tried using $1 and such in the function, but then it just takes the global one the whole script was called from. Basically what I'm looking for is something like $1, $2 and so on but in the local context of a function. Like you know, functions work in any proper language. When does $\,n\mid q^3 \Rightarrow n\mid q\,$? I think this is true because of prime factorisations, i.e.  If $3$ a factor of the prime factorisation of $q^3$, then $3$ is a factor of the prime factorisation of $q$.  Therefore If $3$ divides $q^3$, then $3$ divides $q$.  Or for a general case, if $n$ divides $q^3$; then $n$ divides $q$. Is this correct? How do you remove a file whose filename begins with a dash (hyphen or minus) -?  I'm ssh'd into a remote OSX server and I have this file in my directory:  tohru:~ $ ls -l total 8 -rw-r--r--    1 me  staff  1352 Aug 18 14:33 --help ...   How in the world can I delete --help from a CLI?  This issue is something that I come across in different forms on occasion, these files are easy to create, but hard to get rid of.  I have tried using backslash  rm \-\-help   I have tried quotes  rm "--help"   How do I prevent the minus (dash or hyphen) character to be interpreted as an option? How can I prevent false score reports to global highscore tables? Browser and mobile games commonly have global highscore tables. It's also common for those tables to contain scores of 2,147,483,647 &mdash; where people have figured out the webservice call that reports scores and used it to record a fictitious score.  For simple puzzle games, we can defend against this by including a record of every move the player made (and any random seeds used to generate the level) with the score-reporting call. The entire game can then be reproduced and verified on the server.  However, this quickly becomes infeasible for anything larger than Pac-man.  How else can cheating of this kind be prevented? How can I automatically add some skeleton code when creating a new file with vim When creating a new file with vim, I would like to automatically add some skeleton code.  For example, when creating a new xml file, I would like to add the first line:    &lt;?xml version="1.0"?&gt;   Or when creating an html file, I would like to add:  &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt; &lt;html&gt;   &lt;head&gt;     &lt;title&gt;&lt;/title&gt;   &lt;/head&gt;   &lt;body&gt;   &lt;/body&gt; &lt;/html&gt; Is there a way to get DateTime value from timestamp type column? Why is the amount of photos that fit on one card dependent on ISO? This looks a little bit like a variation on  but specific to the tags view.  Reproduction (app version 1.0.71):   Select any site (say Meta) from the sidebar Switch to the tags view using the top bar Choose a tag, any tag ( is nice)   optionaly refine your search with more terms  Go to any question found, go back   you end on the unfiltered tags view  Go back again   lucky you, your search is here