Unix has no distinction between text and binary files, which is why you can just `cat` them together:

    cat file1 file2 &gt; target_file

`cat` is a very useful utility that will output the content of one or more files to standard output. That can be redirected with shell-funcionality into a file. It will work with binary or ascii files. In some programming languages that do not use linking, cat is used to merge binary files into a single executable file.

    cat file1 file2 &gt; target_file



How to use union all in LINQ TO SQL.
I have use the following code for union, then how to use this for union all?

    List&lt;tbEmployee&gt; lstTbEmployee = obj.tbEmployees.ToList();
    List&lt;tbEmployee2&gt; lstTbEmployee2 = (from a in lstTbEmployee
                                        select new tbEmployee2
                                        {
                                            eid = a.eid,
                                            ename = a.ename,
                                            age = a.age,
                                            dept = a.dept,
                                            doj = a.doj,
                                            dor = a.dor
    
                                        }).Union(obj.tbEmployee2s).ToList();

How to use union all in LINQ?

I have a function as

    def getEvents(eid, request):
        ......

Now I want to write unit test for the above function separately (without calling the view). 
So how should I call the above in `TestCase`. Is it possible to create request ?





how to get request object in django unit testing?

I need to copy the content of a folder which contains binary files to one binary file in another directory. 

In Windows I can just use:

    copy file1 + file2 targetfile /B 

I couldn&#39;t find something similar for Linux (I saw an approach with `cat`, but I&#39;m unsure if this really works for binary files).

How can I copy several binary files into one file on a Linux system?

I need to copy the content of a folder which contains binary files to one binary file in another directory.
In Windows I can just use:
<pre><code class="hljs language-css">copy file1 + file2 targetfile /B 
</code></pre>
I couldn't find something similar for Linux (I saw an approach with <code>cat</code>, but I'm unsure if this really works for binary files).

Is there any `Bash` shebang objectively better than the others for most uses?


* `#!/usr/bin/env bash`
* `#!/bin/bash`
* `#!/bin/sh`
* `#!/bin/sh -`
* etc

I vaguely recall a long time ago hearing that adding a dash to the end prevents someone passing a command to your script, but can’t find any details on that.


What is the preferred Bash shebang?

I know I can use `cd` command to change my working directory in bash.  

But if I do this command:

    cd SOME_PATH &amp;&amp; run_some_command

Then the working directory will be changed permanently. Is there some way to change the working directory just temporarily like this?

    PWD=SOME_PATH run_some_command

Temporarily change current working directory in bash to run a command

What is the meaning of this style in bash?

    ${PUBLIC_INTERFACE:-eth0}

What is the purpose of `:-`?

 


Usage of :- (colon dash) in bash

Currently in Bash I use `set -o vi` to enable vi mode in my bash prompt.

How do I get this going in ipython?

How do I use vi keys in ipython under *nix?

I&#39;m trying to automate the process of building apps for our clients using bash scripts running on a Mac Mini Server (OSX 10.7). 

My script is based on the spectacularly useful script from github originally posted at https://gist.github.com/949831

I&#39;m building the app using xcodebuild, and then signing and embedding the mobileprovision file using xcrun.

When I do all this with a mobileprovision file I manually installed into Xcode using the GUI (e.g. double-clicking) it works fine. If I simply try to use a mobileprovision file copied onto the server with SCP it fails (Code Sign error: Provisioning profile &#39;123abc123&#39; can&#39;t be found.) 

Presumably this is because the file isn&#39;t &#39;installed&#39;.

Is there any way to install the mobileprovision file from the terminal? I&#39;m using SSH so using things such as the &#39;open&#39; command won&#39;t work.

Thanks!


Can an Xcode .mobileprovision file be &#39;installed&#39; from the command line?

I have a buffer with some binary data:

    var b = new Buffer ([0x00, 0x01, 0x02]);

and I want to append `0x03`.

How can I append more binary data? I&#39;m searching in the documentation but for appending data it must be a string, if not, an error occurs (*TypeError: Argument must be a string*):

    var b = new Buffer (256);
    b.write (&quot;hola&quot;);
    console.log (b.toString (&quot;utf8&quot;, 0, 4)); //hola
    b.write (&quot;, adios&quot;, 4);
    console.log (b.toString (&quot;utf8&quot;, 0, 11)); //hola, adios

Then, the only solution I can see here is to create a new buffer for every appended binary data and copy it to the major buffer with the correct offset:

    var b = new Buffer (4); //4 for having a nice printed buffer, but the size will be 16KB
    new Buffer ([0x00, 0x01, 0x02]).copy (b);
    console.log (b); //&lt;Buffer 00 01 02 00&gt;
    new Buffer ([0x03]).copy (b, 3);
    console.log (b); //&lt;Buffer 00 01 02 03&gt;

But this seems a bit inefficient because I have to instantiate a new buffer for every append.

Do you know a better way for appending binary data?


  [1]: https://github.com/Gagle/Node-BufferedWriter
  [2]: https://github.com/Gagle/Node-BufferedReader


**EDIT**

I&#39;ve written a [BufferedWriter][1] that writes bytes to a file using internal buffers. Same as [BufferedReader][2] but for writing.

A quick example:

    //The BufferedWriter truncates the file because append == false
    new BufferedWriter (&quot;file&quot;)
    	.on (&quot;error&quot;, function (error){
    		console.log (error);
    	})
    	
    	//From the beginning of the file:
    	.write ([0x00, 0x01, 0x02], 0, 3) //Writes 0x00, 0x01, 0x02
    	.write (new Buffer ([0x03, 0x04]), 1, 1) //Writes 0x04
    	.write (0x05) //Writes 0x05
    	.close (); //Closes the writer. A flush is implicitly done.
    
    //The BufferedWriter appends content to the end of the file because append == true
    new BufferedWriter (&quot;file&quot;, true)
    	.on (&quot;error&quot;, function (error){
    		console.log (error);
    	})
    	
    	//From the end of the file:
    	.write (0xFF) //Writes 0xFF
    	.close (); //Closes the writer. A flush is implicitly done.
    
    //The file contains: 0x00, 0x01, 0x02, 0x04, 0x05, 0xFF

**LAST UPDATE**

Use [concat](http://nodejs.org/api/buffer.html#buffer_class_method_buffer_concat_list_totallength).

How to append binary data to a buffer in node.js

In order to convert an integer to a binary, I have used this code :

    &gt;&gt;&gt; bin(6)  
    &#39;0b110&#39;

and when to erase the &#39;0b&#39;, I use this :

    &gt;&gt;&gt; bin(6)[2:]  
    &#39;110&#39;

What can I do if I want to show `6` as `00000110` instead of `110`?

Converting integer to binary in python

My images are stored in a MongoDB, and I&#39;d like to return them to the client,  here is how the code is like:

    @app.route(&quot;/images/&lt;int:pid&gt;.jpg&quot;)
    def getImage(pid):
        # get image binary from MongoDB, which is bson.Binary type
        return image_binary

However, it seems that I can&#39;t return binary directly in Flask? My idea so far:

1. Return the `base64` of the image binary. The problem is that IE&lt;8 doesn&#39;t support this.
2. Create a temporary file then return it with `send_file`.

Are there better solutions?

Flask to return image stored in database

What is the advantage of 2&#39;s complement over 1&#39;s complement in negative number representation in binary number system? How does it affect the range of values stored in a certain bit representation of number in binary system?

Advantage of 2&#39;s complement over 1&#39;s complement?

What is the easiest way (using a graphical tool or command line on Ubuntu Linux) to know if two binary files are the same or not (except for the time stamps)? I do not need to actually extract the difference. I just need to know whether they are the same or not.

How to compare binary files to check if they are the same?

I need to copy a `cv::Mat` image (source) to an ROI of another (Destination) `cv::Mat` image.

I found [this reference][1], but it seems that it does not work for my case.
Do you have any pointers how could I do this using the OpenCV C++ interface?


  [1]: https://stackoverflow.com/questions/7041181/equivalent-to-cvsetimageroi-in-the-opencv-c-interface

Copy an cv::Mat inside a ROI of another one

I am new to SQL, and what I needed to do was to combine 2 .mdf databases into one. I did that using SQL Server 2008 Manager - Tasks &gt; Import/Export tables.The tables and views were copied successfully, but there are no Stored procedures in the new database. Is there any way to do that?

SQL Server - copy stored procedures from one db to another

When a file is created (`FileSystemWatcher_Created`) in one directory I copy it to another. But When I create a big (&gt;10MB) file it fails to copy the file, because it starts copying already, when the file is not yet finished creating...  
This causes **Cannot copy the file, because it&#39;s used by another process** to be raised. ;(  
Any help?


    class Program
    {
        static void Main(string[] args)
        {
            string path = @&quot;D:\levan\FolderListenerTest\ListenedFolder&quot;;
            FileSystemWatcher listener; 
            listener = new FileSystemWatcher(path);
            listener.Created += new FileSystemEventHandler(listener_Created);
            listener.EnableRaisingEvents = true;
    
            while (Console.ReadLine() != &quot;exit&quot;) ;
        }
    
        public static void listener_Created(object sender, FileSystemEventArgs e)
        {
            Console.WriteLine
                    (
                        &quot;File Created:\n&quot;
                       + &quot;ChangeType: &quot; + e.ChangeType
                       + &quot;\nName: &quot; + e.Name
                       + &quot;\nFullPath: &quot; + e.FullPath
                    );
            File.Copy(e.FullPath, @&quot;D:\levan\FolderListenerTest\CopiedFilesFolder\&quot; + e.Name);
            Console.Read();
        }
    }

Wait Until File Is Completely Written

How do I copy a folder from remote to local host using `scp`?

I use `ssh` to log in to my server.  
Then, I would like to copy the remote folder `foo` to local `/home/user/Desktop`.

How do I achieve this?

How do I copy a folder from remote to local using scp?

I wonder whether copying a vector&lt;int&gt; I am copying the vector with its values (whereas this is not working with array, and deep copy need a loop or memcpy).

Could you hint to an explanation?

Regards 

Content Type	Original Author	Original Content on Stackoverflow
Question	Ahatius	View Question on Stackoverflow
Solution 1 - Bash	geekosaur	View Answer on Stackoverflow
Solution 2 - Bash	choroba	View Answer on Stackoverflow

How can I copy several binary files into one file on a Linux system?

Bash Problem Overview

Bash Solutions

Solution 1 - Bash

Solution 2 - Bash

how to get request object in django unit testing?

How to use union all in LINQ?

Attributions