Once `gdb` starts, you can run the program using &quot;r _args_&quot;.  

So if you are running your code by: 

    $ executablefile arg1 arg2 arg3 

Debug it on `gdb` by:

    $ gdb executablefile  
    (gdb) r arg1 arg2 arg3

Try 

    gdb --args InsertionSortWithErrors arg1toinsort arg2toinsort

I&#39;m using GDB7.1.1, as `--help` shows:

    gdb [options] --args executable-file [inferior-arguments ...]

IMHO, the order is a bit unintuitive at first.



Another option, once inside the GDB shell, before running the program, you can do

    (gdb) set args file1 file2

and inspect it with:

    (gdb) show args



Is it possible to filter out some requests using Chrome developer tools, say, filter out all image requests?

Is there a way to filter network requests using Google Chrome developer tools?

I have the following code which repeats and displays the name of the user and his score:

    &lt;div ng-controller=&quot;AngularCtrl&quot; ng-app&gt;
      &lt;div ng-repeat=&quot;user in users | orderBy:predicate:reverse | limitTo:10&quot;&gt;
        &lt;div ng-init=&quot;user.score=user.id+1&quot;&gt;
            {{user.name}} and {{user.score}}
        &lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;

And the corresponding angular controller.

    function AngularCtrl($scope) {
  	    $scope.predicate = &#39;score&#39;;
  	    $scope.reverse = true;
        $scope.users = [{id: 1, name: &#39;John&#39;}, {id: 2, name: &#39;Ken&#39;}, {id: 3, name: &#39;smith&#39;}, {id: 4, name: &#39;kevin&#39;}, {id: 5, name: &#39;bob&#39;}, {id: 6, name: &#39;Dev&#39;}, {id: 7, name: &#39;Joe&#39;}, {id: 8, name: &#39;kevin&#39;}, {id: 9, name: &#39;John&#39;}, {id: 10, name: &#39;Ken&#39;}, {id: 11, name: &#39;John&#39;}, {id: 1, name: &#39;John&#39;}, {id: 2, name: &#39;Ken&#39;}, {id: 3, name: &#39;smith&#39;}, {id: 4, name: &#39;kevin&#39;}, {id: 5, name: &#39;bob&#39;}, {id: 6, name: &#39;Dev&#39;}, {id: 7, name: &#39;Joe&#39;}, {id: 8, name: &#39;kevin&#39;}, {id: 9, name: &#39;John&#39;}, {id: 10, name: &#39;Ken&#39;}]
    }









When I run the above code, I get the **Error: 10 $digest() iterations reached. Aborting!** error in my console. 

I have created [jsfiddle](http://jsfiddle.net/JSWorld/7ecYd/1/) for same. 

The sort predicate is being initialized only inside the ng-repeat and also the limit is being applied on the number of objects. so I feel having both the sortby and limitTo watchers together is the reason for error.

If the $scope.reverse is false (ascending order of score), then it does not error.

Can anyone help me understand what is wrong here? Much appreciate your help.



Error: 10 $digest() iterations reached. Aborting! with dynamic sortby predicate

I have to debug a program that has errors in it as part of my assignment. However, I must first pass command line arguments in order to solve this problem.

I do:

    gdb -tui InsertionSortWithErrors

which works, but after that I don&#39;t know how to pass arguments. I used `gdb -help` and it says something about `--args` which I also tried and it didn&#39;t work.

I want to be able to get the debugger+the GUIand pass command line arguments.



How do I pass a command line argument while starting up GDB in Linux?

I have to debug a program that has errors in it as part of my assignment. However, I must first pass command line arguments in order to solve this problem.
I do:
<pre><code class="hljs">gdb -tui InsertionSortWithErrors
</code></pre>
which works, but after that I don't know how to pass arguments. I used <code>gdb -help</code> and it says something about <code>--args</code> which I also tried and it didn't work.
I want to be able to get the debugger+the GUIand pass command line arguments.

Suppose defined: `int a[100]`  Type `print a` then gdb will automatically display it as an array:`1, 2, 3, 4...`. However, if `a` is passed to a function as a parameter, then gdb will treat it as a normal int pointer, type `print a` will display:`(int *)0x7fffffffdaa0`. What should I do if I want to view `a` as an array?

How to view a pointer like an array in GDB?

I came across the data type `int32_t` in a C program recently.  I know that it stores 32 bits, but don&#39;t `int` and `int32` do the same?

Also, I want to use `char` in a program.  Can I use `int8_t` instead? What is the difference?

To summarize: **what is the difference between int32, int, int32_t, int8 and int8_t in C?**

Difference between int32, int, int32_t, int8 and int8_t

I&#39;m writing a console program in C++ to download a large file. I know the file size, and I start a work thread to download it. I want to show a progress indicator to make it look cooler.

How can I display different strings at different times, but at the same position, in cout or printf?

How to display a progress indicator in pure C/C++ (cout/printf)?

I saw an interesting technique used in an [answer][1] to [another question][2], and would like to understand it a little better.

We&#39;re given an unsigned 64-bit integer, and we are interested in the following bits:

    1.......2.......3.......4.......5.......6.......7.......8.......

Specifically, we&#39;d like to move them to the top eight positions, like so:

    12345678........................................................

We don&#39;t care about the value of the bits indicated by `.`, and they don&#39;t have to be preserved.

The [solution][1] was to mask out the unwanted bits, and multiply the result by `0x2040810204081`. This, as it turns out, does the trick.

How general is this method? Can this technique be used to extract any subset of bits? If not, how does one figure out whether or not the method works for a particular set of bits?

Finally, how would one go about finding the (a?) correct multiplier to extract the given bits?

  [1]: https://stackoverflow.com/a/14539116/367273
  [2]: https://stackoverflow.com/questions/14537831/isolate-specific-row-column-diagonal-from-a-64-bit-number

Extracting bits with a single multiplication

By considering that the memory is divided into four segments: data, heap, stack, and code, where do global variables, static variables, constant data types, local variables (defined and declared in functions), variables (in main function), pointers, and dynamically allocated space (using malloc and calloc) get stored in memory?

I think they would be allocated as follows:

- Global variables  -------&gt;  data
- Static variables  -------&gt;  data
- Constant data types -----&gt;  code
- Local variables (declared and defined in functions)  --------&gt;  stack
- Variables declared and defined in main function  -----&gt;  heap
- Pointers (for example, `char *arr`, `int *arr`) -------&gt;  heap
- Dynamically allocated space (using malloc and calloc) --------&gt; stack

I am referring to these variables only from the C perspective.

Please correct me if I am wrong as I am new to C.


Where in memory are my variables stored in C?

There are two files called **&quot;a.txt&quot;** and **&quot;b.txt&quot;** both have a list of words. Now I want to check which words are extra in **&quot;a.txt&quot;** and  are not in **&quot;b.txt&quot;**. 

I need a efficient algorithm as I need to compare two dictionaries.

Comparing two files in linux terminal

I&#39;m working with a CentOS server. I have a folder named `test` located in `/home/server/folder/test`. I need to copy the directory `test` to `/home/server/`. How can I do it?

CentOS: Copy directory to another directory

I have created a simple program in java:

    public static void main(String[] args) throws InterruptedException {
        while (true) 
            ;
    }

If I run this on a Linux machine, it shows 100% CPU usage, but doesn&#39;t cause the OS to appear slow.  However, if I run the exact same code on Windows, it only shows about 20% CPU usage.

I am using Oracle JRE on Windows and OpenJDK 6 on Linux.

I&#39;m wondering if Windows&#39; scheduler preempt threads randomly and Linux&#39;s doesn&#39;t?

Why does “while(true)” without “Thread.sleep” cause 100% CPU usage on Linux but not on Windows?

I have installed **mongo-10gen mongo-10gen-server** on Linux CentOS server.

I followed the steps from [**Link**][1].

I have configured **/etc/mongod.conf** as - 

    logpath=/var/log/mongo/mongod.log
    port=27017
    dbpath=/var/lib/mongo

I have set port 27017 for mongo in **iptables**.
To start mongo I used commands - 

    service mongod start and
    mongo

It get started well, but after few days I am getting the error - 


    Tue Jan 29 08:41:54 [initandlisten] ERROR: Insufficient free space for journal files
    Tue Jan 29 08:41:54 [initandlisten] Please make at least 3379MB available in /var/lib/mongo/journal or use --smallfiles
    Tue Jan 29 08:41:54 [initandlisten]
    Tue Jan 29 08:41:54 [initandlisten] exception in initAndListen: 15926 Insufficient free space for journals, terminating
    Tue Jan 29 08:41:54 dbexit:
    Tue Jan 29 08:41:54 [initandlisten] shutdown: going to close listening sockets...
    Tue Jan 29 08:41:54 [initandlisten] shutdown: going to flush diaglog...
    Tue Jan 29 08:41:54 [initandlisten] shutdown: going to close sockets...
    Tue Jan 29 08:41:54 [initandlisten] shutdown: waiting for fs preallocator...
    Tue Jan 29 08:41:54 [initandlisten] shutdown: lock for final commit...
    Tue Jan 29 08:41:54 [initandlisten] shutdown: final commit...
    Tue Jan 29 08:41:54 [initandlisten] shutdown: closing all files...
    Tue Jan 29 08:41:54 [initandlisten] closeAllFiles() finished
    Tue Jan 29 08:41:54 [initandlisten] journalCleanup...
    Tue Jan 29 08:41:54 [initandlisten] removeJournalFiles
    Tue Jan 29 08:41:54 [initandlisten] shutdown: removing fs lock...
    Tue Jan 29 08:41:54 dbexit: really exiting now



When I execute the command - 

    service mongod status

It gives Error - 

    mongod dead but subsys locked


Please help me to solve the problem of ***mongod dead but subsys locked*** and ***Insufficient free space for journals, terminating***


  [1]: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-redhat-centos-or-fedora-linux/

Why getting error mongod dead but subsys locked and Insufficient free space for journal files on Linux?

I have been searching and tried various alternatives without success and spent several days on it now - driving me mad.

Running on Red Hat Linux with Python 2.5.2
Began using most recent Virtualenv but could not activate it, I found somewhere suggesting needed earlier version so I have used Virtualenv 1.6.4 as that should work with Python 2.6.

It seems to install the virtual environment ok
---------
    [necrailk@server6 ~]$ python virtualenv-1.6.4/virtualenv.py virtual
    New python executable in virtual/bin/python
    Installing setuptools............done.
    Installing pip...............done.

Environment looks ok
---------------------
    [necrailk@server6 ~]$ cd virtual
    [necrailk@server6 ~/virtual]$ dir
    bin  include  lib

Trying to activate
---------------------
    [necrailk@server6 ~/virtual]$ . bin/activate
    /bin/.: Permission denied.

Checked chmod
---------------------
    [necrailk@server6 ~/virtual]$ cd bin
    [necrailk@server6 bin]$ ls -l
    total 3160
    -rw-r--r--    1 necrailk biz12        2130 Jan 30 11:38 activate
    -rw-r--r--    1 necrailk biz12        1050 Jan 30 11:38 activate.csh
    -rw-r--r--    1 necrailk biz12        2869 Jan 30 11:38 activate.fish
    -rw-r--r-

Problem, so I changed it
----------------------
    [necrailk@server6 bin]$ ls -l
    total 3160
    -rwxr--r--    1 necrailk biz12        2130 Jan 30 11:38 activate
    -rw-r--r--    1 necrailk biz12        1050 Jan 30 11:38 activate.csh
    -rw-r--r--    1 necrailk biz12        2869 Jan 30 11:38 activate.fish
    -rw-r--r--    1 necrailk biz12        1005 Jan 30 11:38 activate_this.py
    -rwxr-xr-x    1 necrailk biz

Try `activate` again
--------------------
    [necrailk@server6 ~/virtual]$ . bin/activate
    /bin/.: Permission denied.

Still no joy...

How to activate virtualenv in Linux?

When using [Safari Web Inspector][1] to read the JavaScript console output, the log is reset upon navigation i.e. going from page *index.html* to *mail.html* clears the console output. In the [Chrome Developer Tools][2], I can easily preserve the log by right clicking on the console space and selecting *Preserve Log Upon Navigation*. With this option, console log output remains intact until I manually clear the output simplifying the process of debugging JavaScript that refreshes or redirects to another page. 

Is there a similar feature in Safari Web Inspector? 


  [1]: https://developer.apple.com/library/safari/documentation/AppleApplications/Conceptual/Safari_Developer_Guide/Introduction/Introduction.html
  [2]: https://developers.google.com/chrome-developer-tools/docs/console

Safari Developer Tools: How to Preserve Console Log Upon Navigation?

`list` commands prints a set of lines, but I need one single line, where I am and where an error has probably occurred.



gdb: how to print the current line or find the current line number?

Every time `console.log` is executed, a line saying `undefined` is appended to the output log.

It happens in both Firefox and Chrome on Windows and Linux.


Chrome/Firefox console.log always appends a line saying &#39;undefined&#39;

I don&#39;t understand why I am getting the error: 

&gt; initialization of &#39;element&#39; is skipped by &#39;case&#39; label. 

Can someone please explain to me?

    void LinkedList::process_example(int choice) {
        switch(choice) {
        case 1:
            cout &lt;&lt; endl &lt;&lt; endl &lt;&lt; &quot;Current S = &quot;;
            this-&gt;printSet();

            cout &lt;&lt; &quot;Enter an element :&quot;;
            char* element = &quot;lol&quot;;

            //cin&gt;&gt;element;
            cin.clear();
            cin.ignore(200, &#39;\n&#39;);

            this-&gt;Addelementfromback(element); //error is here
            cout &lt;&lt; endl &lt;&lt; endl &lt;&lt; &quot;Current S = &quot;;

            this-&gt;printSet();
            break;
        
        case 2:
            this-&gt;check_element();
            break;

        case 3:
            cout &lt;&lt; endl &lt;&lt; endl;
            cout &lt;&lt; &quot;Current Set S = &quot;;
            this-&gt;printSet();

            cout &lt;&lt; endl &lt;&lt; &quot;S has &quot;;
            int count = this -&gt;check_cardinality();
            cout &lt;&lt; count &lt;&lt; &quot; elements&quot;;
            break;
        }
    }

initialization of &#39;element&#39; is skipped by &#39;case&#39; label

When I want to try or debug smthing I run `rails console` and do some stuff there. I can print some text or variables from code by raising exception with `raise &quot;blablabla&quot;`.
**Question:** How I can just write to *rails console* without exception raising (and obvious breaking code execution) like a simple `logger.info &quot;blah&quot;`?

Write to rails console

At some point during my work, Xcode&#39;s `po` and `p` commands stopped working. No matter what I enter, it doesn&#39;t generate output:

    (gdb) po self
    (gdb) po [self name]
    (gdb) po [UITableView class]
    (gdb) po @&quot;Hello&quot;
    (gdb) p indexPath.row
    (gdb) print indexPath.row
    (gdb) po fjkldsjflksdjklwjfkljfkldsjflk
    (gdb)

When I enter any of these commands, the command line just goes to the next line, where it prints the blue `(gdb)`, but no output.

I tried the following steps:

- Restart Xcode, restart my Macbook
- Tried while debugging in the simulator as well as on a iOS device
- Switched to LLDB and restarted
- Re-installed Xcode

The other debugging tools in Xcode seem to work okay: Breakpoints, step-by-step execution, the **Auto** variable examination window etc.

**Any ideas?**

**EDIT:** Doesn&#39;t work even after a re-install of Xcode.


po command in Xcode does not generate output

In gdb, after reaching a breakpoint, I want to list all the variables in the current context, instead of giving each variable name explicitly? Is there any way to achieve this at all?

How to list all variables in the current context in gdb?

Is there an equivalent command in GDB to that of WinDbg&#39;s `!process 0 7`?

I want to extract all the threads in a dump file along with their backtraces in GDB. `info threads` doesn&#39;t output the stack traces. So, is there a command that does?


How do I get the backtrace for all the threads in GDB?

I would like to use argparse to parse boolean command-line arguments written as &quot;--foo True&quot; or &quot;--foo False&quot;. For example:

    my_program --my_boolean_flag False

However, the following test code does not do what I would like:

    import argparse
    parser = argparse.ArgumentParser(description=&quot;My parser&quot;)
    parser.add_argument(&quot;--my_bool&quot;, type=bool)
    cmd_line = [&quot;--my_bool&quot;, &quot;False&quot;]
    parsed_args = parser.parse(cmd_line)

Sadly, `parsed_args.my_bool` evaluates to `True`. This is the case even when I change `cmd_line` to be `[&quot;--my_bool&quot;, &quot;&quot;]`, which is surprising, since `bool(&quot;&quot;)` evalutates to `False`.

How can I get argparse to parse `&quot;False&quot;`, `&quot;F&quot;`, and their lower-case variants to be `False`?


Parsing boolean values with argparse

Using python and argparse, the user could input a file name with -d as the flag.

    parser.add_argument(&quot;-d&quot;, &quot;--dmp&quot;, default=None)

However, this failed when the path included spaces. E.g. 

    -d C:\SMTHNG\Name with spaces\MORE\file.csv

NOTE: the spaces would cause an error (flag only takes in &#39;C:SMTHNG\Name&#39; as input).

    error: unrecognized arguments: with spaces\MORE\file.csv

Took me longer than it should have to find the solution to this problem...
(did not find a Q&amp;A for it so I&#39;m making my own post)

Handle spaces in argparse input

I would like my Bash script to print an error message if the required argument count is not met.

I tried the following code:

    #!/bin/bash
    echo Script name: $0
    echo $# arguments 
    if [$# -ne 1]; 
    	then echo &quot;illegal number of parameters&quot;
    fi

For some unknown reason I&#39;ve got the following error:

    test: line 4: [2: command not found

What am I doing wrong?

Check number of arguments passed to a Bash script

Is there some sort of character limit imposed in bash (or other shells) for how long an input can be? If so, what is that character limit?

I.e. Is it possible to write a command in bash that is too long for the command line to execute?
If there is not a required limit, is there a suggested limit? 

Bash command line and input limit

I need to overwrite the date of the commit of git, all the documentation points to --date parameter, but then leaves one without a clue to the appropriate format. I&#39;ve tried every permutation i can think of, and i&#39;m getting &quot;fatal: invalid date format:&quot; error for each and every one.

Content Type	Original Author	Original Content on Stackoverflow
Question	ShadyBears	View Question on Stackoverflow
Solution 1 - C	ldav1s	View Answer on Stackoverflow
Solution 2 - C	Basile Starynkevitch	View Answer on Stackoverflow
Solution 3 - C	Alex	View Answer on Stackoverflow
Solution 4 - C	Fernando Gonzalez Sanchez	View Answer on Stackoverflow

How do I pass a command line argument while starting up GDB in Linux?

C Problem Overview

C Solutions

Solution 1 - C

Solution 2 - C

Solution 3 - C

Solution 4 - C

Error: 10 $digest() iterations reached. Aborting! with dynamic sortby predicate

Is there a way to filter network requests using Google Chrome developer tools?

Attributions