You can get the window back on your screen by using 

**`ALT + spacebar`**

This would show you the maximize/minimize/ ... options. Click maximize and it would occupy your screen.

You can also hit &quot;move&quot; and then either your mouse or arrow keys to move the window to your current window.

Be sure to have the off-screen window selected (use Alt-Tab or Super-W for example). Then **hold Alt+F7 and move the window with the cursor keys** until it appears in the viewport.

When this happens to me the hidden window is usually below the screen (I occasionally use two screens with one on top of the other, a setup that agrees well with a laptop on a desk). If you use Super-W to select the window, you can guess where it is by looking at the animations. Holding Alt+F7+Up brings the window into view for me.

Cheers.

I made a little script to fix a similiar bug I have in ubuntu 15.04 with two screens: https://github.com/mezga0153/offscreen-window-restore

The script makes use of the wmctrl command line tool to find the offscreen windows and then uses wmctrl to place each one back into a visible area.

&gt; **Possible Duplicate:**  
&gt; [A Transpose/Unzip Function in Python](https://stackoverflow.com/questions/19339/a-transpose-unzip-function-in-python)  

&lt;!-- End of automatically inserted text --&gt;

I have a list of tuples, where I want to unzip this list into two independent lists. I&#39;m looking for some standardized operation in Python. 

    &gt;&gt;&gt; l = [(1,2), (3,4), (8,9)]
    &gt;&gt;&gt; f_xxx (l)
    [ [1, 3, 8], [2, 4, 9] ] 

I&#39;m looking for a succinct and pythonic way to achieve this. 

Basically, I&#39;m hunting for inverse operation of [`zip()`][1] function. 


  [1]: http://docs.python.org/library/functions.html?highlight=zip#zip

How to unzip a list of tuples into individual lists?

How to copy a collection from one database to another in MongoDB

I have a dual monitor setup, and I am using Ubuntu 12.04 LTS
I have changed the positioning of the monitors several times, and now for some reason some of the windows open up off-screen (outside of both screens), Update Manager, for instance.
How can I position the windows on one of my screens?

Window appears off screen on ubuntu

<p>I have a dual monitor setup, and I am using Ubuntu 12.04 LTS
I have changed the positioning of the monitors several times, and now for some reason some of the windows open up off-screen (outside of both screens), Update Manager, for instance.
How can I position the windows on one of my screens?</p>


I have recently completed the *Wiki web development tutorial* ([http://golang.org/doc/articles/wiki/][1]). I had tons of fun and I would like to experiment more with the net/http package.

However, I noticed that when I run the wiki from a console, the wiki takes over the console. If I close the console terminal or stop the process with &lt;kbd&gt;CTRL+Z&lt;/kbd&gt; then the server stops.

How can I get the server to run in the background? I think the term for that is running in a daemon.

I&#39;m running this on Ubuntu 12.04. Thanks for any help.


  [1]: http://golang.org/doc/articles/wiki/

How do I get my Golang web server to run in the background?

How can I check if a directory exists on Linux in C?


How can I check if a directory exists?


I&#39;m trying to do a simple `git clone https://github.com/org/project.git` on a CentOS box but get:

&gt; error: The requested URL returned error: 401 while accessing
&gt; https://github.com/org/project.git/info/refs
&gt; 
&gt; fatal: HTTP request failed

It never prompts me for my username/password, just fails.

I can make the exact same call on my Mac no problem- what am I missing?



Can&#39;t clone a github repo on Linux via HTTPS

I am trying to build a simple C program for two different Linux environments. On one device the program runs fine, on the other device the program generates a floating point exception. The program does nothing but return 0 from main which leads me to believe there is some incompatibility with the start-up code perhaps ABI?

The program is compiled with gcc with the following build specs:

&gt; Using built-in specs. Target: i386-redhat-linux Configured with:
&gt; ../configure --prefix=/usr --mandir=/usr/share/man
&gt; --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --disable-plugin --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic --host=i386-redhat-linux Thread model: posix gcc version 4.1.2 20080704 (Red Hat 4.1.2-52)


The program source is the following:

    int main()
    {
            return(0);
    }

On the Celeron device this program generates the following under GDB:

    [root@n00200C30AA2F jrn]# /jrn/gdb fail GNU gdb Red Hat Linux (5.3post-0.20021129.18rh) (gdb) run Starting program: /jrn/fail 
    
    Program received signal SIGFPE, Arithmetic exception. 0x40001cce in ?? () (gdb) bt
    #0  0x40001cce in ?? ()
    #1  0x4000c6b0 in ?? ()
    #2  0x40000cb5 in ?? ()

Below are the details that I can think to gather to help find out what is happening:

&lt;!-- language: none --&gt;

    CELERON:  ( fails on this device )
    2.6.8 #21 Mon Oct 1 11:41:47 PDT 2007 i686 i686 i386 GNU/Linux
    ============
    [root@n00200C30AA2F proc]# cat cpuinfo 
    processor       : 0
    vendor_id       : GenuineIntel
    cpu family      : 6
    model           : 9
    model name      : Intel(R) Celeron(R) M processor          600MHz
    stepping        : 5
    cpu MHz         : 599.925
    cache size      : 512 KB
    fdiv_bug        : no
    hlt_bug         : no
    f00f_bug        : no
    coma_bug        : no
    fpu             : yes
    fpu_exception   : yes
    cpuid level     : 2
    wp              : yes
    flags           : fpu vme de pse tsc msr mce cx8 sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 tm pbe
    bogomips        : 1179.64
    
    GNU C Library stable release version 2.3.2, by Roland McGrath et al.
    Compiled by GNU CC version 3.2.2 20030222 (Red Hat Linux 3.2.2-5).
    Compiled on a Linux 2.4.20 system on 2003-03-13.
    Available extensions:
            GNU libio by Per Bothner
            crypt add-on version 2.1 by Michael Glad and others
            linuxthreads-0.10 by Xavier Leroy
            BIND-8.2.3-T5B
            libthread_db work sponsored by Alpha Processor Inc
            NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk
    
    ATOM:  ( works fine on this device )
    2.6.35 #25 SMP Mon Mar 12 09:02:45 PDT 2012 i686 i686 i386 GNU/Linux
    ==========
    [root@n00E04B36ECE5 ~]# cat /proc/cpuinfo 
    processor       : 0
    vendor_id       : GenuineIntel
    cpu family      : 6
    model           : 28
    model name      : Genuine Intel(R) CPU N270   @ 1.60GHz
    stepping        : 2
    cpu MHz         : 1599.874
    cache size      : 512 KB
    fdiv_bug        : no
    hlt_bug         : no
    f00f_bug        : no
    coma_bug        : no
    fpu             : yes
    fpu_exception   : yes
    cpuid level     : 10
    wp              : yes
    flags           : fpu vme de tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc up arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 xtpr pdcm movbe lahf_lm
    bogomips        : 3199.74
    clflush size    : 64
    cache_alignment : 64
    address sizes   : 32 bits physical, 32 bits virtual
    power management:
    
    
    GNU C Library stable release version 2.5, by Roland McGrath et al.
    Compiled by GNU CC version 4.1.2 20080704 (Red Hat 4.1.2-44).
    Compiled on a Linux 2.6.9 system on 2009-09-02.
    Available extensions:
            The C stubs add-on version 2.1.2.
            crypt add-on version 2.1 by Michael Glad and others
            GNU Libidn by Simon Josefsson
            GNU libio by Per Bothner
            NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk
            Native POSIX Threads Library by Ulrich Drepper et al
            BIND-8.2.3-T5B
            RT using linux kernel aio
    Thread-local storage support included.


What can I do to determine what is causing this problem?
How about trying to statically link against a certain version of libc?

After failure occurs under GDB I execute:

&gt;     (gdb) x/1i $eip
&gt;     0x40001cce:     divl   0x164(%ecx)
&gt; 

    (gdb) info reg
    eax            0x6c994f 7117135
    ecx            0x40012858       1073817688
    edx            0x0      0
    ebx            0x40012680       1073817216
    esp            0xbffff740       0xbffff740
    ebp            0xbffff898       0xbffff898
    esi            0x8049580        134518144
    edi            0x400125cc       1073817036
    eip            0x40001cce       0x40001cce
    eflags         0x10246  66118
    cs             0x73     115
    ss             0x7b     123
    ds             0x7b     123
    es             0x7b     123
    fs             0x0      0
    gs             0x0      0
    (gdb) x/1wx 0x164+$ecx
    0x400129bc:     0x00000000
    (gdb) 


Based on the help I&#39;ve received it appears that for some reason the libc startup code is dividing by 0. 

The question now is, what is causing this obviously bad behavior? Something must be incompatible with something else? 

**Assembly output:**

    [jrn@localhost ~]$ more fail.s
            .file   &quot;fail.c&quot;
            .text
    .globl main
            .type   main, @function
    main:
            leal    4(%esp), %ecx
            andl    $-16, %esp
            pushl   -4(%ecx)
            pushl   %ebp
            movl    %esp, %ebp
            pushl   %ecx
            movl    $0, %eax
            popl    %ecx
            popl    %ebp
            leal    -4(%ecx), %esp
            ret
            .size   main, .-main
            .ident  &quot;GCC: (GNU) 4.1.2 20080704 (Red Hat 4.1.2-52)&quot;
            .section        .note.GNU-stack,&quot;&quot;,@progbits

  




Floating point exception ( SIGFPE ) on &#39;int main(){ return(0); }&#39;

I learned the &quot;**[Program Library HOWTO][1]**&quot;. It mention that using `soname` to manage the version like follow.

    gcc -shared -fPIC -Wl,-soname,libfoo.so.1  -o libfoo.so.1.0.0 foo.c
    ln -s libfoo.so.1.0.0  libfoo.so.1
    ln -s libfoo.so.1 libfoo.so

And I get the information that if the `soname` is not set. it will be equal to libfoo.so.1.0.0 ,see the answer from [here][2].

And I find that it also can work without soname , like following   

     gcc -shared -fPIC -o libfoo.so.1.0.0 foo.c
     ln -s libfoo.so.1.0.0  libfoo.so.1
     ln -s libfoo.so.1 libfoo.so

So I think that the only one useful point is that the `soname` option can tell you the version of the shared library when you use `readelf -d libfoo.so` command to check it. 

**What else can it do?**


  [1]: http://tldp.org/HOWTO/Program-Library-HOWTO/
  [2]: https://stackoverflow.com/questions/4071962/how-does-linker-find-shared-library-without-soname

What is the &#39;soname&#39; option for building shared libraries for?

I&#39;m on Ubuntu, and I want to install Boost. I tried with

    sudo apt-get install boost

But there was no such package. What is the best way to install Boost on Ubuntu?



How to install Boost on Ubuntu

I&#39;d like to send a local REST request in a flask app, like this:

    from flask import Flask, url_for, request
    import requests

    app = Flask(__name__)

    @app.route(&quot;/&lt;name&gt;/hi&quot;, methods=[&quot;POST&quot;])
    def hi_person(name):
        form = {&quot;name&quot;: name}
        return requests.post(url_for(&quot;hi&quot;, _external=True), data=form)

    @app.route(&quot;/hi&quot;, methods=[&quot;POST&quot;])
    def hi():
        return &#39;Hi, %s!&#39; % request.form[&quot;name&quot;]

Sending `curl -X POST http://localhost:5000/john/hi` causes the entire flask app to freeze.  When I send a kill signal, I get a broken pipe error. Is there a way to prevent flask from freezing here?

Flask broken pipe with requests

I am trying to compile ARM code on [Ubuntu 12.04][1] (Precise Pangolin).

Everything is working fine when I put the code in the local directory.

But when I put the code in the cited mount directory, an error shows up:

    making testXmlFiles
    sh: 0: getcwd() failed: No such file or directory
    ARM Compiling xxxxx.c
    sh: 0: getcwd() failed: No such file or directory

Here is my setting in [fstab][2]:

    //10.0.0.1/data /mnt/data   cifs    auto,noserverino,credentials=/root/.smbcredentials,file_mode=0777,dir_mode=0777,uid=user,gid=users,noperm 0 0

What is going on here? What could cause this error?

  [1]: https://en.wikipedia.org/wiki/Ubuntu_version_history#Ubuntu_12.04_LTS_.28Precise_Pangolin.29
  [2]: https://en.wikipedia.org/wiki/Fstab






sh: 0: getcwd() failed: No such file or directory on cited drive

I have Symfony2 running on an Ubuntu Server 12.04 (64-bit) VM (VirtualBox).  The host is a MacBook pro.  For some reason I am getting really long request times in development mode (app_dev.php).  I know its slower in dev mode, but I&#39;m talking 5-7 seconds per request (sometimes even slower).  On my Mac I get request times of 200ms or so in development mode.

After looking at my timeline in the Symfony2 profiler, I noticed that ~95% of the request time is &quot;initialization time&quot;.  What is this?  What are some reasons it could be so slow?

This issue only applies to Symfony2 in dev mode, not any other sites I&#39;m running on the VM, and not even to Symfony2 in production mode.

I saw this (http://stackoverflow.com/questions/11162429/whats-included-in-the-initialization-time-in-the-symfony2-web-profiler), but it doesn&#39;t seem to answer my questions.

Symfony2 Slow Initialization Time

When I tried to install mongoDb in my AWS EC2 Linux instance:Ubuntu 12.04.1 LTS,

    deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen

I get this following error, meaning deb command is not found.
```
$ deb Sorry, command-not-found has crashed! Please file a bug report
at: https://bugs.launchpad.net/command-not-found/+filebug Please
include the following information with the report:
 
command-not-found version: 0.2.44
```
Can someone please help me find out how to install deb in my AWS instance?

AWS EC2 Ubuntu 12.04.1 LTS: deb command-not-found

Okay, so, I switched from ubuntu 12.04 64-bit to 32-bit and installed `build-essential.`

I then compiled and installed GMP-5.0.5, MPFR-3.1.1, MPC-1.0, ISL-0.10 and CLOOG-0.17.0. I checked out a copy of the main gcc trunk and attempted to build it with the following configure line (from a separate directory):

    ../svnsrc/configure --prefix=/usr/GCC/svn --enable-__cxa_atexit --with-plugin-ld=/usr/bin/ld.gold --enable-threads=posix --enable-werror --enable-build-with-cxx --with-gmp=/usr/GCC/prereq/svn --with-mpfr=/usr/GCC/prereq/svn --with-mpc=/usr/GCC/prereq/svn --with-isl=/usr/GCC/prereq/svn --with-cloog=/usr/GCC/prereq/svn --enable-languages=c,c++

Configure ran fine and so I ran `make &amp;&amp; make check`. This ran fine for a while, but then it failed with the following error:

    /home/matt/GCC/svnbuild/./gcc/xgcc -B/home/matt/GCC/svnbuild/./gcc/ -B/usr/GCC/svn/i686-pc-linux-gnu/bin/ -B/usr/GCC/svn/i686-pc-linux-gnu/lib/ -isystem /usr/GCC/svn/i686-pc-linux-gnu/include -isystem /usr/GCC/svn/i686-pc-linux-gnu/sys-include    -g -O2 -O2  -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem ./include   -fpic -mlong-double-80 -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector   -fpic -mlong-double-80 -I. -I. -I../.././gcc -I../../../svnsrc/libgcc -I../../../svnsrc/libgcc/. -I../../../svnsrc/libgcc/../gcc -I../../../svnsrc/libgcc/../include -I../../../svnsrc/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c ../../../svnsrc/libgcc/libgcc2.c -fvisibility=hidden -DHIDE_EXPORTS
    In file included from /usr/include/stdio.h:28:0,
                     from ../../../svnsrc/libgcc/../gcc/tsystem.h:88,
                     from ../../../svnsrc/libgcc/libgcc2.c:29:
    /usr/include/features.h:324:26: fatal error: bits/predefs.h: No such file or directory
     #include &lt;bits/predefs.h&gt;
                              ^
    compilation terminated.
    make[3]: *** [_muldi3.o] Error 1
    make[3]: Leaving directory `/home/matt/GCC/svnbuild/i686-pc-linux-gnu/libgcc
I looked around, but everything I seemed to find was that this error was caused on x86_64, by not installing `gcc-multilib`, because Ubuntu and Debian use the mutiarch system, separating the libraries. Okay, fine...but I&#39;m using i686, so why would I need the 64-bit libraries? Any help would be appreciated. Thanks.

gcc cannot find bits/predefs.h on i686

I have installed:

 - eclipse juno
 - java-6-openjdk-i386 (selected as default JRE in Eclipse)
 - java-7-openjdk-i386

When I try to add a new server Tomcat7, in Eclipse, I get this message 

**&#39;Cannot create a server using the selected type&#39;**

and I can not continue. No problem adding Tomcat6 server.

I read this [question][1] but it didn&#39;t solve it for me 


  [1]: https://stackoverflow.com/questions/8025841/eclipse-3-7-indigo-tomcat7-cannot-create-a-server-using-the-selected-typ

Eclipse 4.2 (Juno) &#39;Cannot create a server using the selected type&#39; in Tomcat 7

I have installed sbt on Ubuntu.

    :~/bin/sbt/bin$ ls
    classes    sbt      sbt-launch.jar       target
    jansi.jar  sbt.bat  sbt-launch-lib.bash  win-sbt

However, whenever I try to launch sbt (from the same directory where sbt is located) it does not work:

    No command &#39;sbt&#39; found, did you mean:
     Command &#39;skt&#39; from package &#39;latex-sanskrit&#39; (universe)
     Command &#39;sb2&#39; from package &#39;scratchbox2&#39; (universe)
     Command &#39;sbd&#39; from package &#39;cluster-glue&#39; (main)
     Command &#39;mbt&#39; from package &#39;mbt&#39; (universe)
     Command &#39;sbmt&#39; from package &#39;atfs&#39; (universe)
     Command &#39;lbt&#39; from package &#39;lbt&#39; (universe)
     Command &#39;st&#39; from package &#39;suckless-tools&#39; (universe)
     Command &#39;sb&#39; from package &#39;lrzsz&#39; (universe)

I am new to linux and I have no idea how to tackle this issue.


Install sbt on ubuntu

I know this sounds stupid, but when I use

    SELECT CONVERT_TZ(&#39;2004-01-01 12:00:00&#39;,&#39;UTC&#39;,&#39;Asia/Jakarta&#39;) AS time

it outputs NULL. I&#39;m using MySQL Workbench in Ubuntu 12.04 64 bit, and it works in my other laptop/os (also using MySQL Workbench).


convert_tz returns null

Learning debugging in PhpStorm and keep accidentally hitting &lt;kbd&gt;Ctrl&lt;/kbd&gt; + &lt;kbd&gt;Alt&lt;/kbd&gt; + &lt;kbd&gt;F8&lt;/kbd&gt;. I use 3 displays this disconnects the two remotes and goes back to just the laptop.

I cannot see this documented anywhere (running Win 10).

The worst part is that hitting the combination again does NOT reconnect the displays. 

Anyone know either:

* combination to reverse the effect - IE reconnect displays

* how I can stop it or 

* a tool that will help me find out where it is firing from (motherboard/Windows/Intel/nVidia/USB monitor driver - goodness knows where).

Grateful for a helping hand. &lt;kbd&gt;F8&lt;/kbd&gt; in various combinations are the debugging shortcuts for PhpStorm and I keep hitting &lt;kbd&gt;Ctrl&lt;/kbd&gt; + &lt;kbd&gt;Alt&lt;/kbd&gt; + &lt;kbd&gt;F8&lt;/kbd&gt; accidentally. I am about to throw a monitor out of the window. 

EDIT Apologies. When I posted this it said &lt;kbd&gt;Ctrl&lt;/kbd&gt; + &lt;kbd&gt;Shift &lt;/kbd&gt; + &lt;kbd&gt;F8&lt;/kbd&gt; in error. Hope did not confuse anyone.

Oops misremembered my own post!.

Ctrl Alt F8 disconnects displays?

Using multiple screens I normally place multiple classes (files) in different screens, this helps me a lot while refactoring, checking tests and comparing changes.
Visual Studio Code does not allow me to drag a tab outside the window and view it in (for example) another monitor.
I checked the documentation and plugins, but the only way I found, is to open two windows, pointing to the same project (folder) and put those in different screens.
I don&#39;t like this solution, that causes also some problem when I watch code changes using TypeScript.

Any suggestion?

I use Windows 10, latest version of VSCode.

Content Type	Original Author	Original Content on Stackoverflow
Question	Mladen Danic	View Question on Stackoverflow
Solution 1 - Linux	ibaralf	View Answer on Stackoverflow
Solution 2 - Linux	Georg Jung	View Answer on Stackoverflow
Solution 3 - Linux	Tine Mezgec	View Answer on Stackoverflow

Window appears off screen on ubuntu

Linux Problem Overview

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How to copy a collection from one database to another in MongoDB

How to unzip a list of tuples into individual lists?

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