You can use `:w !cmd` to write the current buffer to the stdin of an external command. From `:help :w_c`:

```none
                                                        :w_c :write_c
:[range]w[rite] [++opt] !{cmd}
                        Execute {cmd} with [range] lines as standard input
                        (note the space in front of the &#39;!&#39;).  {cmd} is
                        executed like with &quot;:!{cmd}&quot;, any &#39;!&#39; is replaced with
                        the previous command :!.
```

A related command is `:%!cmd` which does the same thing and then replaces the current buffer with the output of the command. So `:%!sort` would invoke the external sort command to sort the current buffer in place. From `:help :range!`:

```
:{range}![!]{filter} [!][arg]                           :range!
                        Filter {range} lines through the external program
                        {filter}.  Vim replaces the optional bangs with the
                        latest given command and appends the optional [arg].
                        Vim saves the output of the filter command in a
                        temporary file and then reads the file into the buffer
                        tempfile.  Vim uses the &#39;shellredir&#39; option to
                        redirect the filter output to the temporary file.
                        However, if the &#39;shelltemp&#39; option is off then pipes
                        are used when possible (on Unix).
                        When the &#39;R&#39; flag is included in &#39;cpoptions&#39; marks in
                        the filtered lines are deleted, unless the
                        :keepmarks command is used.  Example: 
                                :keepmarks &#39;&lt;,&#39;&gt;!sort
                        When the number of lines after filtering is less than
                        before, marks in the missing lines are deleted anyway.
```

Here is example how to send the current buffer to external stdin from the command line:

    vim -es +&quot;w &gt;&gt; /dev/stdout&quot; -cq! /etc/hosts

It&#39;s useful for scripting purposes.

For more command-line tricks, check:

- [How to write whole buffer to standard output from the command line?][1]


  [1]: https://vi.stackexchange.com/q/798/467

The deal here is that I have an array with 17 elements. I want to get the elements I need for a certain time and remove them permanently from the array.

Here&#39;s the code:

    $name = $post[&#39;name&#39;];
	$email = $post[&#39;email&#39;];
	$address = $post[&#39;address&#39;];
	$telephone = $post[&#39;telephone&#39;];
	$country = $post[&#39;country&#39;];
	
	unset($post[&#39;name&#39;]);
	unset($post[&#39;email&#39;]);
	unset($post[&#39;address&#39;]);
	unset($post[&#39;telephone&#39;]);
	unset($post[&#39;country&#39;]);

Yes the code is ugly, no need to bash. How do I make this look better?




Better way to unset multiple array elements

I just recently downloaded the Xcode 4.2 with iOS 5 SDK package and I immediately noticed that I am unable to use my iPhone 3Gs with iOS 4.2.1 for debugging. I am only able to debug and test on my iphone 4 with iOS 5 installed. 

For any of my devices running any iOS less than 5.0 Xcode just says &quot;Finished running &lt;app&gt; for iPhone3GS&quot; and doesn&#39;t run it. I have my deployment target set to 3.0 because I am not using any features in my app above 3.0 and I want to be able to target all versions 3.0 or higher. I have all my provisioning profiles installed and up to date.
 
I have quit and restarted xcode, I have cleaned the build multiple times. I have tried adding armv6 in the archtecture build settings, but nothing will allow me to build and run my app on my old phone with ios 4.2.1. 
 
My question is, is it possible to still make apps with the new SDK work for iOS versions lower than 5? How can I be sure that my app will still run on lower iOS versions if I am unable to install them on my old phone?

**Edit:**
*OK it looks like iOS SDK 5 dropped support for armv6 by default. What you have to do is add armv6 in the Architectures field under Build Settings for both your Target and your Project. Then your app will be able to run on iPhone 3G devices.
Answer can be found here
https://stackoverflow.com/questions/7488657/how-to-build-for-armv6-and-armv7-architectures-with-ios-5*

Is it possible to target older iOS versions when using Xcode 4.2 and iOS 5 SDK?

I would like to send contents of the current buffer to stdin of external command (like mail). 

How do I send a Vim buffer to an external command?

Piping buffer to external command in Vim

<p>I would like to send contents of the current buffer to stdin of external command (like mail).</p>
<p>How do I send a Vim buffer to an external command?</p>


I am new to vim, and still exploring some features of it. I have a problem with vimgrep. I can search for a pattern like this `vimgrep /define/ **` so that it finds and opens next file that contains a `define`. But I couldn&#39;t yet find out how to go to the next file/line that matches my pattern. Any pointers?

How to jump between patterns when using :vimgrep (Quickfix list)?

When I quit VIM and open the same file again, I am positioned at the start of the file. How can I preserve the last cursor position?

Preserve last editing position in VIM

I installed NerdTree plugin.

How can i open a file at right side as vsplit from a left side NerdTree panel ?

VIM: How can i open a file at right side as vsplit from a left side NerdTree panel?

I&#39;m trying to install the Command-T plugin.

I compiled vim following the instructions in this comment: https://stackoverflow.com/questions/3794895/installing-vim-with-ruby-support-ruby/3851435#3851435

So now there&#39;s the +ruby flag, but still when I try to use the plugin I get this error:

    command-t.vim could not load the C extension
    Please see INSTALLATION and TROUBLE-SHOOTING in the help              
    For more information type:    :help command-t

I have ruby on my system:

    &gt; ruby -v
    &gt; ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]

suggestions?

Vim Command-T plugin error: could not load the C extension

Suppose I&#39;m searching a class `JFactory` inside a folder and it&#39;s sub-directories.

How can I file that file which contains `class JFactory`?

I don&#39;t want to replace that word but I need to find that file that contains `class JFactory`.

How can I search a word in whole project/folder recursively?

I want to output some data to a pipe and have the other process do something to the data line by line. Here is a toy example:

    mkfifo pipe
    cat pipe&amp;
    cat &gt;pipe

Now I can enter whatever I want, and after pressing enter I immediately see the same line. But if substitute second pipe with `echo`:

    mkfifo pipe
    cat pipe&amp;
    echo &quot;some data&quot; &gt;pipe

The pipe closes after `echo` and `cat pipe&amp;` finishes so that I cannot pass any more data through the pipe. Is there a way to avoid closing the pipe and the process that receives the data, so that I can pass many lines of data through the pipe from a bash script and have them processed as they arrive?

How to avoid echo closing FIFO named pipes? - Funny behavior of Unix FIFOs

I typically run my program with:

    perl -e &#39;print &quot;A&quot;x200&#39; | ./vuln_prog

The stdin is consumed by a `gets()` function in C++.

If this were just a command argument, I could open gdb by doing:

    gdb ./vuln_prog
    run $(perl -e &#39;print &quot;A&quot;x200&#39;)

However, my scenario is not a command argument, but rather input (STDIN?).  How would I debug this in gdb?  I&#39;ve tried a bunch of options, but nothing seems to really work.

I would normally just run gdb on the process, and when it prompts for user input, type it in, however I&#39;m not wanting to type just &quot;A&quot;.  I want to type all chars from \x00-\xff, which I can&#39;t type.


gdb - debugging with piped input (not arguments)

What are the fundamental differences between queues and pipes in [Python&#39;s multiprocessing package][1]?

In what scenarios should one choose one over the other?  When is it advantageous to use `Pipe()`?  When is it advantageous to use `Queue()`?


  [1]: http://docs.python.org/library/multiprocessing.html

Multiprocessing - Pipe vs Queue

I&#39;ve a pipline doing just 

     command1 | command2

So, stdout of command1 goes to command2 , while stderr of command1 go to the terminal (or wherever stdout of the shell is). 

How can I pipe stderr of command1 to a third process (`command3`) while stdout is still going to command2 ?

pipe stdout and stderr to two different processes in shell script?

I often use pipes in Bash, e.g.:

    dmesg | less

Although I know what this outputs, it takes `dmesg` and lets me scroll through it with `less`, I do not understand what the `|` is doing. Is it simply the opposite of `&gt;`?

- Is there a simple, or metaphorical explanation for what `|` does?
- What goes on when several pipes are used in a single line?
- Is the behavior of pipes consistent everywhere it appears in a Bash script?

What is a simple explanation for how pipes work in Bash?

I have a little issue with creating a directory and saving a file to it on my android application. I&#39;m using this piece of code to do this :

	String filename = &quot;MyApp/MediaTag/MediaTag-&quot;+objectId+&quot;.png&quot;;
	File file = new File(Environment.getExternalStorageDirectory(), filename);
	FileOutputStream fos;
	
	fos = new FileOutputStream(file);
	fos.write(mediaTagBuffer);
	fos.flush();
	fos.close();

But it&#39;s throwing an exception :

&gt; java.io.FileNotFoundException: /mnt/sdcard/MyApp/MediaCard/MediaCard-0.png (No such file or directory)

on that line : `fos = new FileOutputStream(file);`
 
If I set the filename to : `&quot;MyApp/MediaTag-&quot;+objectId+&quot;` it&#39;s working, but If I try to create and save the file to an another directory it&#39;s throwing the exception. So any ideas what I&#39;m doing wrong?

And another question: Is there any way to make my files private in external storage so user can&#39;t see them in gallery, only if he connect his device as `Disk Drive`?

Android saving file to external storage

I have a module foo, containing util.py and bar.py.

I want to import it in IDLE or python session. How do I go about this?

I could find no documentation on how to import modules not in the current directory or the default python PATH.
After trying `import &quot;&lt;full path&gt;/foo/util.py&quot;`,
and `from &quot;&lt;full path&gt;&quot; import util` 

The closest I could get was

    import imp
    imp.load_source(&#39;foo.util&#39;,&#39;C:/.../dir/dir2/foo&#39;)

Which gave me Permission denied on windows 7.

Import python module NOT on path

I have an HTML file named `showMap.html`:

&lt;!-- language: lang-html --&gt;

    &lt;!DOCTYPE html&gt;
    &lt;html&gt;

    &lt;head&gt;
      &lt;meta name=&quot;viewport&quot; content=&quot;initial-scale=1.0, user-scalable=no&quot; /&gt;
      &lt;meta http-equiv=&quot;content-type&quot; content=&quot;text/html; charset=UTF-8&quot; /&gt;
      &lt;title&gt;Map&lt;/title&gt;
      &lt;script type=&quot;text/javascript&quot; src=&quot;http://maps.google.com/maps/api/js?sensor=false&quot;&gt;
      &lt;/script&gt;
      &lt;script type=&quot;text/javascript&quot; src=&quot;js/map.js&quot;&gt;&lt;/script&gt;
    &lt;/head&gt;

    &lt;body onload=&quot;showPosition()&quot;&gt;
      &lt;div id=&quot;map_canvas&quot; style=&quot;width:500px;height:500px;&quot;&gt;&lt;/div&gt;
    &lt;/body&gt;

    &lt;/html&gt;

And another JavaScript file `map.js` is placed in the `js` folder of the same directory.

This code works fine when the HTML file is loaded, but this does not work when I run it in the server.

I use Python&#39;s Flask framework for back-end programming and the funny thing is that the same thing will work well if I expand the JavaScript code inside the HTML file. The only problem is with the external file.

External JavaScript file is not getting added when running on Flask

I have several SVG graphics I&#39;d like to modify the colors of via my external style sheets - not directly within each SVG file. I&#39;m not putting the graphics in-line, but storing them in my images folder and pointing to them.

I have implemented them in this way to allow tooltips to work, and I also wrapped each in an `&lt;a&gt;` tag to allow a link.

    &lt;a href=&#39;http://youtube.com/...&#39; target=&#39;_blank&#39;&gt;&lt;img class=&#39;socIcon&#39; src=&#39;images/socYouTube.svg&#39; title=&#39;View my videos on YouTube&#39; alt=&#39;YouTube&#39; /&gt;&lt;/a&gt;

And here is the code of the SVG graphic:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;?xml-stylesheet href=&quot;stylesheets/main.css&quot; type=&quot;text/css&quot;?&gt;
    &lt;!DOCTYPE svg PUBLIC &quot;-//W3C//DTD SVG 1.1//EN&quot; &quot;http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd&quot;&gt;
    
    &lt;svg version=&quot;1.1&quot; id=&quot;Layer_1&quot; xmlns=&quot;http://www.w3.org/2000/svg&quot; xmlns:xlink=&quot;http://www.w3.org/1999/xlink&quot; viewBox=&quot;0 0 56.69 56.69&quot;&gt;
    &lt;g&gt;
    	&lt;path d=&quot;M28.44......./&gt;
    &lt;/g&gt;
    &lt;/svg&gt;

I put the following in my external CSS file (main.css):

    .socIcon g {fill:red;}

Yet it has no effect on the graphic. I also tried .socIcon g path {} and .socIcon path {}.

Something isn&#39;t right, perhaps my implementation doesn&#39;t allow external CSS modifications, or I missed a step? I&#39;d really appreciate your help! I just need the ability to modify the colors of the SVG graphic via my external stylesheet, but I cannot lose the tooltip and link ability. (I may be able to live without tooltips though.) Thanks!

How to style SVG with external CSS?

My files are
  
    // main.c  

    #include &quot;add.c&quot;

    int main(void) {
        int result = add(5,6);
        printf(&quot;%d\n&quot;, result);
    }  

and
    
    // add.c  

    int add(int a, int b) {
        return a + b;
    }

Content Type	Original Author	Original Content on Stackoverflow
Question	yasar	View Question on Stackoverflow
Solution 1 - Vim	John Kugelman	View Answer on Stackoverflow
Solution 2 - Vim	kenorb	View Answer on Stackoverflow

Piping buffer to external command in Vim

Vim Problem Overview

Vim Solutions

Solution 1 - Vim

Solution 2 - Vim

Is it possible to target older iOS versions when using Xcode 4.2 and iOS 5 SDK?

Better way to unset multiple array elements

Attributions