How to see which directory occupy the most disk?
Tracking down where disk space has gone on Linux?
Why do my shortcut icons get broken on Windows 7? I have a strange problem. My icons seem to disappear randomly on my Windows 7. They were there a while back, now they ain't.  It happens often and quite randomly. Anyone know a fix? QGIS locked into fullscreen mode on Ubuntu 12.04 No crash in this case, but I made the mistake of toggling to fullscreen mode on my netbook running Ubuntu 12.04. It's now impossible to escape , and it seems to have disabled the popout unity launcher as well. Steps I've already taken:   Alt-Tab to move to a different program, then back - QGIS remains in fullscreen Alt-V, Ctrl-F and F11 get no response I've unistalled QGIS, deleted the /.qgis/ profile data folder, and reinstalled. Still launches fullscreen   To add to the weirdness, it now launches - still in fullscreen - into a different workspace than the active one.  I realize this has the sound of a Unity problem, but it's just this program that has a malfunctioning UI.  Thanks to all the crew; this in no way changes my opinion of QGIS as an essential tool. Non-static variable cannot be referenced from a static context What if the answers of a historical locked question become obsolete? My understanding is that a question is historically locked because the information in it is too valuable for the question to be deleted.   But if the "valuable information" becomes obsolete, what happens then?  We cannot modify the question content, or the answers for a historically locked question, right? As far as I understand, one of the main claimed problems with initializing e.g. a feed-forward neural network (with several $\text{tanh}$ or $\text{ReLU}$ layers) with $W=0$ is that it doesn't break "network symmetry", meaning, backpropagation would propagate the same error through all such units (i.e. "nudging all weights in the same direction"). This is, I presume, undesirable because we would not be learning "different" calculations through different paths of the network.  However, I'm confused why that even matters in this case given the fact that if $W$ ever drops to 0, we will effectively be propagating no gradients at all through the network, since W=0 would multiply all errors from the output and prevent any learning.  Put another way, even if $W=0$ does not break network symmetry (wasting calculations and paths in the network) is it correct to say that if $W=0$ (e.g. by initialization) we are effectively killing gradients in a neural network, and thus no learning can take place? MySQL ERROR 1045 (28000): Access denied for user 'bill'@'localhost' (using password: YES) What does the "static" modifier after "import" mean? When used like this:  import static com.showboy.Myclass;  public class Anotherclass{}   what's the difference between import static com.showboy.Myclass and import com.showboy.Myclass? Why does the question's closed status disappear when clicking to load a new edit? Updating a chart dynamically in Numbers Background: I've been having some sleep issues so I have started tracking my sleep habits along with some other data but so far, they are just entries in Evernote and as such it is not possible to see any patterns. Obviously I need a spreadsheet app with charting capabilities (doh!). I've been using a great iPhone app called  for data collection for sleep times and then enter those into Evernote.  I have the iWork set so I have been looking at Numbers and going through some tutorials but I still can't tell if it will do what I want. Given that my data set will increase daily, I'd like to be able to "page through" a chart/data set, so it shows say the last 30 data entries. With all the tutorials I have seen, the charts are of fixed size and adding more data to a linked table just causes the chart to cram more stuff in.  Can Numbers do this sort of "paging" of data? I would like to have this sort of "on the fly" charting rather than having to explicitly build a chart each time I want to visualize the data.   (sorry the question is rather garbled: I don't know really anything about using a spreadsheet type app) On every boot up I get this:    For about 10 seconds (or more) before the "normal" Ubuntu Gnome loading screen and the login screen comes up.  I've read some questions and a bug report about this already, but this problem was dismissed as a minor inconvenience or there were no real solutions (that worked for me). For me, this problem leads to an unacceptable slow boot compared to Ubuntu (Unity) or Windows.  Does anybody know how to fix this or is this a "feature" of Ubuntu Gnome and not a bug? How to show/hide a column at runtime? I'd like to show/hide a column at runtime based on a particular condition. I'm using "Print when expression" to conditionally show/hide this column (and it's header) in my report. When the column is hidden, the space it would have occupied is left blank, which is not particularly attractive.  I would prefer if the extra space was used in a more effective manner, possibilities include:   the width of the report is reduced by the width of the hidden column the extra space is distributed among the remaining columns   In theory, I could achieve the first by setting the width of the column (and header) to 0, but also indicate that the column should resize to fit its contents. But JasperReports does not provide a "resize width to fit contents" option.  Another possibility is to generate reports using the Jasper API instead of defining the report template in XML. But that seems like a lot of effort for such a simple requirement. Bad substitution: no closing "`" in a heredoc / EOF I'd like to print a man style usage message to describe a shell function like this output man find:  NAME        find - search for files in a directory hierarchy  SYNOPSIS        find [-H] [-L] [-P] [-D debugopts] [-Olevel] [starting-point...] [expression]  DESCRIPTION        This  manual  page  documents the GNU version of find.  GNU find searches the directory tree rooted at each        given starting-point by evaluating the given expression from left to  right,  according  to  the  rules  of        precedence  (see section OPERATORS), until the outcome is known (the left hand side is false for and opera‐        tions, true for or), at which point find moves on to the next file name.  If no  starting-point  is  speci‐        fied, `.' is assumed.  OPTIONS   I am facing an error message on the ` character. Following simple script shows the error:  ~$ cat &lt;&lt;EOF `.' EOF  bash: bad substitution: no closing "`" in `.'   I though heredoc was a cool way to echo strings by pasting them without having to escape its content such a quotes, etc... I assume I was wrong :/  Can someone explain this behavior please? Can heredoc accept ` character?  Edit 2: I accepted the answer of quoted here-document  &lt;&lt;'END_HELP', but I finally won't use it for this kind of complete manual output as  does   Edit 1: (For future reads) the limit with using quoted here-document is that is prevents to use tput in the here-document. To do so, I did the following:   unquoted here-document, for tput commands to be executed prevent the "bad substitution" error by escaping the backtick instead use tput within the  here-document   Example:  normal=$( tput sgr0 ) ; bold=$(tput bold) ;  cat &lt;&lt;END_HELP # here-document not quoted ${bold}NAME${normal}        find - search for files in a directory hierarchy  ${bold}SYNOPSIS${normal}        find [-H] [-L] [-P] [-D debugopts] [-Olevel] [starting-point...] [expression]  ${bold}DESCRIPTION${normal}        This  manual  page  documents the GNU version of find.  GNU find searches the directory tree rooted at each        given starting-point by evaluating the given expression from left to  right,  according  to  the  rules  of        precedence  (see section OPERATORS), until the outcome is known (the left hand side is false for and opera‐        tions, true for or), at which point find moves on to the next file name.  If no  starting-point  is  speci‐        fied, \`.' is assumed. END_HELP  unset normal ; unset bold ;   Here, note the escaped backtick that was source of error:  \`.' Proof $1+2+3+4+\cdots+n = \frac{n\times(n+1)}2$ This might be a bizarre but crucial question, can I fully trust leaving my laptop in repairs (Genius Bar) while they have full access to it ?  I recently went to the genius bar to get my display fixed, and apparently they asked for my laptop's password just in case they need some "testing" after they're done. Can't they do that as a guest account ?  I got sensitive information on my laptop such as passport copies etc, as well as passwords saved in Safari's keychains for my bank account, paypal, amazon etc ..  The service is due later on today, shall I change my password and ask them to contact me directly if they need something specific ?? They're going to fix in 3 hours so I'll be in the mall whilst they finish. How to allow non-superusers to mount any filesystem? Is it possible to allow some particular users (e.g. members of a group) to mount any filesystem without superuser privileges on Linux?  Another question might have been "in what ways a user can harm a system by mounting filesystems?" Unable to change payment information to NONE in iOS Appstore Prove that $Ax=0$ has infinite solutions if and only if $ \text{rank}(A)&lt;n$   Here is one way of my if proof, but I don't know how to proof the other part.  Let $r$ be the rank of $A$. Then $ r\leq  n$. If $ r&lt;n$, then there are $n-r$ linearly independent solutions. Furthermore any linear combination of these solutions will also be a solution of $Ax=0$. Hence, in this case, the equation $Ax=0$ has infinite number of solutions Index notation Lorentz transfromation matrix Ubuntu with spyware? Richard Stallman states that Ubuntu "has installed surveillance code". See:   Is this true?   I agree with him that "Any excuse Canonical offers is inadequate....". Finding minimum-area-rectangle for given points?