PowerShell isn&#39;t UNIX. `rm -rf` is UNIX shell code, not PowerShell scripting.

* This is the documentation for `rm` (short for `Remove-Item`) [on PowerShell][1].
* This is the documentation for `rm` [on UNIX][2].

See the difference?

On UNIX, `rm -rf` alone is invalid. You told it what to do via `rm` for _remove_ with the attributes `r` for _recursive_ and `f` for _force_, but you didn&#39;t tell it what that action should be done on. `rm -rf /path/to/delete/` means `rm` (_remove_) with attributes `r` (_recursive_) and `f` (_force_) on the directory `/path/to/remove/` and its sub-directories.

The correct, equivalent command on PowerShell would be:

    rm C:\path\to\delete -r -fo

Note that `-f` in PowerShell is ambiguous for `-Filter` and `-Force` and thus `-fo` needs to be used.

  [1]: http://ss64.com/ps/remove-item.html
  [2]: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/rm.html

You have to use:

    Remove-Item C:\tmp -Recurse -Force

or (short)

    rm C:\tmp -Recurse -Force

This is the one-liner that behaves like `rm -rf`. It first checks for the existence of the path and then tries removing it.

```ps1
if (Test-Path ./your_path) { rm -r -force ./your_path}
```

How would I render a dynamic definition list using AngularJS?

Example:

Data:

    [
        {
            key: &#39;a&#39;,
            value: &#39;x&#39;
        }, {
            key: &#39;b&#39;,
            value: &#39;y&#39;
        }
    ]

Desired HTML:

    &lt;dl&gt;
        &lt;dt&gt;a&lt;/dt&gt;
        &lt;dd&gt;x&lt;/dd&gt;
        &lt;dt&gt;b&lt;/dt&gt;
        &lt;dd&gt;y&lt;/dd&gt;
    &lt;/dl&gt;

The example at http://docs.angularjs.org/tutorial/step_08:

    &lt;dl&gt;
        &lt;dt&gt;Availability&lt;/dt&gt;
        &lt;dd ng-repeat=&quot;availability in phone.availability&quot;&gt;{{availability}}&lt;/dd&gt;
    &lt;/dl&gt;

works for a dynamic number of dds and a static number of dts, but not a dynamic number of both.

How would I render a dynamic definition list using AngularJS?

I am using Twitter Bootstrap--and I am not a frontend developer!  However, it&#39;s making the process almost--dare I say--fun!

I&#39;m a bit confused about tooltips.  They are [covered in the documentation][1] but Twitter assumes some knowledge.  For example, they say to trigger the tooltip with the following JavaScript code.

    $(&#39;#example&#39;).tooltip(options)

After poking around on their source, I realized that fields with tooltips need to be in a class and have the following code run.

    $(&#39;.tooltipclass&#39;).tooltip(options)

But now my question is, why doesn&#39;t Twitter Bootstrap provide such a class `tooltip`?  Just to allow greater configuration?  Is it better to add the individual elements with tooltips to `tooltipclass`, or should I add the surrounding area to `tooltipclass`?  Does it matter if I use a class identifier (`.class`) instead of a name identifier (`#name`)?

  [1]: http://getbootstrap.com/javascript/#tooltips

Tooltips with Twitter Bootstrap

`rm` is to remove item, but what is the parameter `-rf` do or signify?  
___

Whenever I typed help -rf it printed the entire list of available commands in powershell.  What happens if you type rm -rf in powershell? From reading around I&#39;ve gathered that it will delete everything on the drive?  I&#39;m not sure?

Also, is rm -rf same as rm -rf /  

Powershell Command: rm -rf

<code>rm</code> is to remove item, but what is the parameter <code>-rf</code> do or signify?
<hr>
Whenever I typed help -rf it printed the entire list of available commands in powershell. What happens if you type rm -rf in powershell? From reading around I've gathered that it will delete everything on the drive? I'm not sure?
Also, is rm -rf same as rm -rf /

I would like to calculate an [MD5][1] checksum of some content. How do I do this in PowerShell?

  [1]: http://en.wikipedia.org/wiki/MD5


How to get an MD5 checksum in PowerShell

In Powershell, how do I test if a directory is empty?

Powershell test if folder empty

What are the Boolean literals in PowerShell?



Boolean literals in PowerShell

Is there a null coalescing operator in powershell? 

I&#39;d like to be able to do these c# commands in powershell:

    var s = myval ?? &quot;new value&quot;;
    var x = myval == null ? &quot;&quot; : otherval;
 

Null coalescing in powershell

What is the meaning of `$?` in Powershell?

* * *

Edit: [TechNet answers](http://technet.microsoft.com/en-us/library/hh847768.aspx) in tautology, without explaining what &#39;succeed&#39; or &#39;fail&#39; mean.

&gt; $?   
&gt; Contains the execution status of the last operation. It contains TRUE if the last operation succeeded and FALSE if it failed.

I presumed $? would simply test whether $LastExitCode is 0, but I found a [counter example](https://stackoverflow.com/questions/10666101/powershell-lastexitcode-0-but-false-redirecting-stderr-to-stdout-gives-nat) where $? is False but $LastExitCode is True. 


What is `$?` in Powershell?

I have a simple TCP server that listens on a port.

    var net = require(&quot;net&quot;);
  
    var server = net.createServer(function(socket) {
	    socket.end(&quot;Hello!\n&quot;);
    });

    server.listen(7777);

I start it with `node server.js` and then close it with Ctrl + Z on Mac. When I try to run it again with `node server.js` I get this error message:

    node.js:201
            throw e; // process.nextTick error, or &#39;error&#39; event on first tick
              ^
    Error: listen EADDRINUSE
    at errnoException (net.js:670:11)
    at Array.0 (net.js:771:26)
    at EventEmitter._tickCallback (node.js:192:41)

Am I closing the program the wrong way? How can I prevent this from happening?

Stop node.js program from command line

I want to do this command in one line: 

    git pull &amp;&amp; [my passphrase]

How to do it?

How to enter command with password for git pull?

I would like to read the actual source code which the linux commands are written with. I&#39;ve gained some experience using them and now I think it&#39;s time to interact with my machine at a deeper level. 

I&#39;ve found some commands here http://directory.fsf.org/wiki/GNU. Unfortunately I wasn&#39;t able to find basic commands such as &#39;ls&#39; which seems to me easy enough to begin. 

How exactly do I read the source code of the simple shell commands like &#39;ls&#39;? 
I&#39;m running on Ubuntu 12.04

How do I read the source code of shell commands?

Really, I don&#39;t know what happened. Excuse me if this question is so NOOB, but I can&#39;t find the solution for this problem.

&gt;-bash: rvm: command not found

I tried this

&gt;curl -L https://get.rvm.io | bash -s -- --version latest 

but still nothing I need to see the ruby version for use the simplecov because it not works with older version from 1.9 

rvm: command not found MAC OX

I have a view `AttributeView` that contains all sorts of attributes. There&#39;s also a button that when pressed, it should set the default values to the attributes. I also have a `ViewModelBase` class that is a base class for all ViewModels I have.
The problem is I can&#39;t seem to get the button bound to the command with WPF.

I&#39;ve tried this, but it just doesn&#39;t do anything:

    &lt;Button Command=&quot;{Binding DataInitialization}&quot; Content=&quot;{x:Static localProperties:Resources.BtnReinitializeData}&quot;&gt;&lt;/Button&gt;

The command is defined (in the `ViewModelBase`) like this:

    public CommandBase DataInitialization { get; protected set; }

and on application startup a new instance is created for the command:

    DataInitialization = new DataInitializationCommand()

However, the WPF binding doesn&#39;t seem to &quot;find&quot; the command (pressing the button does nothing). The ViewModel used in the current view is derived from the `ViewModelBase`. What else I can try (I&#39;m quite new to WPF so this might be a very simple question)?

How to bind WPF button to a command in ViewModelBase?

I&#39;m trying to define and use a variable in a batch file. It looks like it should be simple:

&lt;!-- language: lang-dos --&gt;
    @echo off

    set location = &quot;bob&quot;
    echo We&#39;re working with &quot;%location%&quot;

The output I get is the following:

    We&#39;re working with &quot;&quot;

What&#39;s going on here? Why is my variable not being echo&#39;d?

Defining and using a variable in batch file

Can someone give me an example of where a batch script would act differently with or without delayed expansion?  Are there any situations where you would NOT want to use delayed expansion? Thanks.

Example of delayed expansion in batch file

How to run multiple dos commands?

I have a `for` loop, which runs detection of server to detect which server works and is fast. And because there is more servers, I wish not to run all server detections in sequence, but in parallel. 

How to run multiple DOS commands in parallel?

I&#39;m trying to compile some java (learning java currently), and to do so I need to change command-prompt&#39;s directory.

    C:\...\Admin&gt; cd D:\Docs\Java
    C:\...\Admin&gt; cd
    C:\...\Admin

It doesn&#39;t change the directory. I try again using quotes:

    C:\...\Admin&gt; cd &quot;D:\Docs\Java&quot;
    C:\...\Admin&gt;

Again it doesn&#39;t change the directory. What am I doing wrong?

Command prompt won&#39;t change directory to another drive

I have a batch file that runs several python scripts that do table modifications.  

1. I want to have users comment out the 1-2 python scripts that they don&#39;t want to run, rather than removing them from the batch file (so the next user knows these scripts exist as options!)

2. I also want to add comments to bring to their attention specifically the variables they need to update in the Batch file before they run it. I see that I can use `REM`. But it looks like that&#39;s more for updating the user with progress after they&#39;ve run it.  

Is there a syntax for more appropriately adding a comment?


How to &quot;comment-out&quot; (add comment) in a batch/cmd?

I have this list of files on a Linux server:

    abc.log.2012-03-14
    abc.log.2012-03-27
    abc.log.2012-03-28
    abc.log.2012-03-29
    abc.log.2012-03-30
    abc.log.2012-04-02
    abc.log.2012-04-04
    abc.log.2012-04-05
    abc.log.2012-04-09
    abc.log.2012-04-10

I&#39;ve been deleting selected log files one by one, using the command `rm -rf` see below:

    rm -rf abc.log.2012-03-14
    rm -rf abc.log.2012-03-27
    rm -rf abc.log.2012-03-28

Is there another way, so that I can delete the selected files at once?


How to delete multiple files at once in Bash on Linux?

I&#39;m trying to work out a command which deletes sql files older than 15 days.

The find part is working but not the rm.

    rm -f | find -L /usr/www2/bar/htdocs/foo/rsync/httpdocs/db_backups -type f  $ -name &#39;*.sql&#39; $ -mtime +15

It kicks out a list of exactly the files I want deleted but is not deleting them.  The paths are correct.  

    usage: rm [-f | -i] [-dIPRrvW] file ...
           unlink file
    /usr/www2/bar/htdocs/foo/rsync/httpdocs/db_backups/20120601.backup.sql
    ...
    /usr/www2/bar/htdocs/foo/rsync/httpdocs/db_backups/20120610.backup.sql

What am I doing wrong?

Command line: piping find results to rm

In Linux, how do I remove folders with a certain name which are nested deep in a folder hierarchy?

The following paths are under a folder and I would like to remove all folders named `a`.  

    1/2/3/a
    1/2/3/b
    10/20/30/a
    10/20/30/b
    100/200/300/a
    100/200/300/b

What Linux command should I use from the parent folder?

How to remove folders with a certain name

sorry if this is a noobie question but I can&#39;t find a good answer.

To find then remove something I can use
 
    find . -name &quot;.txt&quot; -exec rm &quot;{}&quot; \;

But why can&#39;t I just pipe the results to rm like 

    find . -name &quot;.txt&quot; | rm 

like I would pipe it to grep
 
    find . -name &quot;.txt&quot; | grep a

I&#39;ve read from somewhere that rm doesn&#39;t take input from stdin and therefore I can&#39;t pipe it but what does that mean? When I type in rm a.txt it reads from standard input just like I can grep right? Or is there a difference between stdin and command line. Help!



Linux why can&#39;t I pipe find result to rm?

I want to delete all files which have names containing a specific word, e.g. &quot;car&quot;.
So far, I came up with this:

    find|grep car
How do I pass the output to rm?

Content Type	Original Author	Original Content on Stackoverflow
Question	BK_	View Question on Stackoverflow
Solution 1 - Powershell	Mahmoud Al-Qudsi	View Answer on Stackoverflow
Solution 2 - Powershell	Kai Sternad	View Answer on Stackoverflow
Solution 3 - Powershell	Amin	View Answer on Stackoverflow

Powershell Command: rm -rf

Powershell Problem Overview

Powershell Solutions

Solution 1 - Powershell

Solution 2 - Powershell

Solution 3 - Powershell

Tooltips with Twitter Bootstrap

How would I render a dynamic definition list using AngularJS?

Attributions