I have a data.frame `df` with 600+ variables.  I&#39;m writing a function that automates the creation of columns and need to visually check them once.

The `str` function provides a good summary: 

    str(df)
    &#39;data.frame&#39;:	29 obs. of  602 variables:
     $ uniqueSessionsIni: POSIXct, format: &quot;2015-01-05 15:00:00&quot; &quot;2015-01-05 16:00:00&quot; &quot;2015-01-05 17:00:00&quot; ...
     $ uniqueSessionsEnd: POSIXct, format: &quot;2015-01-05 15:59:00&quot; &quot;2015-01-05 16:59:00&quot; &quot;2015-01-05 17:59:00&quot; ...
     $ m0p0             : POSIXct, format: &quot;2015-01-05 15:00:00&quot; &quot;2015-01-05 15:00:00&quot; &quot;2015-01-05 15:00:00&quot; ...
     $ m1p0             : POSIXct, format: &quot;2015-01-05 15:01:00&quot; &quot;2015-01-05 15:01:00&quot; &quot;2015-01-05 15:01:00&quot; ...
     $ m2p0             : POSIXct, format: &quot;2015-01-05 15:02:00&quot; &quot;2015-01-05 15:02:00&quot; &quot;2015-01-05 15:02:00&quot; ...    

and it goes on...  
but truncates the output, as below:

    $ m33p1            : POSIXct, format: &quot;2015-01-05 15:34:00&quot; &quot;2015-01-05 15:34:00&quot; &quot;2015-01-05 15:34:00&quot; ...
    $ m34p1            : POSIXct, format: &quot;2015-01-05 15:35:00&quot; &quot;2015-01-05 15:35:00&quot; &quot;2015-01-05 15:35:00&quot; ...
    $ m35p1            : POSIXct, format: &quot;2015-01-05 15:36:00&quot; &quot;2015-01-05 15:36:00&quot; &quot;2015-01-05 15:36:00&quot; ...
    $ m36p1            : POSIXct, format: &quot;2015-01-05 15:37:00&quot; &quot;2015-01-05 15:37:00&quot; &quot;2015-01-05 15:37:00&quot; ...
    [list output truncated]
How can I display the full list of 602 variables?

list output truncated - How to expand listed variables with str() in R

I have a `String` variable which contains carriage returns and new lines `\r\n`.

    text = &quot;Text1\r\nText2\r\nText3&quot;;

I&#39;m presenting it using `&lt;h:outputtext&gt;`.

    &lt;h:outputText value=&quot;#{bean.text}&quot; /&gt;

But it doesn&#39;t recognize the new line characters and shows as below in webbrowser.

&gt; Text1 Text2 Text3 

Why doesn&#39;t the `&lt;h:outputText&gt;` break `\n` into new lines?

What should I do? Do I have to replace `\n` with `&lt;br /&gt;`?


h:outputText does not break \r\n characters into new lines

If I have an array of strings e.g.

    a = [&#39;a&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;]

and I want to output the elements, to a file (e.g. .txt) one per line. So far I have:

    File.new(&quot;test.txt&quot;, &quot;w+&quot;)
    File.open(&quot;test.txt&quot;, &quot;w+&quot;) do |i|
	    i.write(a)
    end

This gives me the array on one line of the test.txt file.
How can I iterate over the array, adding each value to a new line of the file?

Add each array element to the lines of a file in ruby

I would like to pipe standard output of a program while keeping it on screen.

With a simple example (`echo` use here is just for illustration purpose) :

`$ echo &#39;ee&#39; | foo`  
`ee`  &lt;- the output I would like to see

I know tee could copy stdout to file but that&#39;s not what I want.  
`$ echo &#39;ee&#39; | tee output.txt | foo`

I tried  
`$ echo &#39;ee&#39; | tee /dev/stdout | foo` but it does not work since tee output to `/dev/stdout` is piped to `foo`

How to pipe stdout while keeping it on screen ? (and not to a output file)

Does anyone know how to create multiple output paths in a webpack.config.js file? I&#39;m using bootstrap-sass which comes with a few different font files, etc. For webpack to process these i&#39;ve included file-loader which is working correctly, however the files it outputs are being saved to the output path i specified for the rest of my files: 

&lt;!-- language: lang-js --&gt;

        output: {
          path: __dirname + &quot;/js&quot;,
          filename: &quot;scripts.min.js&quot;
        }

I&#39;d like to achieve something where I can maybe look at the extension types for whatever webpack is outputting and for things ending in .woff .eot, etc, have them diverted to a different output path. Is this possible? 

I did a little googling and came across this *issue on github where a couple of solutions are offered, **edit:** 

but it looks as if you need to know the entry point in able to specify an output using the hash method 
eg: 

&lt;!-- language: lang-js --&gt;

    var entryPointsPathPrefix = &#39;./src/javascripts/pages&#39;;
    var WebpackConfig = {
      entry : {
        a: entryPointsPathPrefix + &#39;/a.jsx&#39;,
        b: entryPointsPathPrefix + &#39;/b.jsx&#39;,
        c: entryPointsPathPrefix + &#39;/c.jsx&#39;,
        d: entryPointsPathPrefix + &#39;/d.jsx&#39;
      },
    
      // send to distribution
      output: {
        path: &#39;./dist/js&#39;,
        filename: &#39;[name].js&#39;
      }
    }


*https://github.com/webpack/webpack/issues/1189

however in my case, as far as the font files are concerned, the input process is kind of abstracted away and all i know is the output. in the case of my other files undergoing transformations, there&#39;s a known point where i&#39;m requiring them in to be then handled by my loaders. if there was a way of finding out where this step was happening, i could then use the hash method to customize output paths, but i don&#39;t know where these files are being required in. 

How to create multiple output paths in Webpack config

I want to get a specific output iterating a Ruby Hash.

This is the Hash I want to iterate over:

    hash = {
      1 =&gt; [&#39;a&#39;, &#39;b&#39;], 
      2 =&gt; [&#39;c&#39;], 
      3 =&gt; [&#39;d&#39;, &#39;e&#39;, &#39;f&#39;, &#39;g&#39;], 
      4 =&gt; [&#39;h&#39;]
    }

This is the output I would like to get:

    1-----
    
    a
    
    b
    
    2-----
    
    c
    
    3-----
    
    d 
    
    e
    
    f
    
    g

    4-----
    
    h

In Ruby, how can I get such an output with my Hash ? 


How to get a specific output iterating a hash in Ruby?

I know you can print with `printf()` and `puts()`. I can also see that `printf()` allows you to interpolate variables and do formatting.

Is `puts()` merely a primitive version of `printf()`. Should it be used for every possible `printf()` without string interpolation?




What is the difference between printf() and puts() in C?

What is the command or the quickest way to output results to console using vbscript?

vbscript output to console

How can I output colored text to the terminal in Python?


How do I print colored text to the terminal?

Is it possible instruct cURL to suppress output of response body?

In my case, the response body is an HTML page, which overflows the CLI buffer, making it difficult to find the relevant information. I want to examine the other parts of the output such as HTTP response code, headers, e.t.c. - everything *except* the actual HTML.

cURL suppress response body

I&#39;m executing some SQL statements in batch (using the `mysql` command-line binary). I want one of my several SELECT statements to not print the column headers, just the selected records. Is this possible?

How can I suppress column header output for a single SQL statement?

Sometimes I want to just insert some print statements in my code, and see what gets printed out when I exercise it. My usual way to &quot;exercise&quot; it is with existing pytest tests. But when I run these, I don&#39;t seem able to see any standard output (at least from within PyCharm, my IDE).

Is there a simple way to see standard output during a pytest run?


How can I see normal print output created during pytest run?

I&#39;m pretty new to CMake, and read a few tutorials on how to use it, and wrote some complicated 50 lines of CMake script in order to make a program for 3 different compilers. This probably concludes all my knowledge in CMake.

Now my problem is that I have some source code, whose folder I don&#39;t want to touch/mess with when I make the program. I want that all CMake and `make` output files and folders to go into `../Compile/`, so I changed a few variables in my CMake script for that, and it worked for sometime when I did something like this on my laptop:

    Compile$ cmake ../src
    Compile$ make

Where with that I had a clean output in the folder I&#39;m in right now, which is exactly what I&#39;m looking for.

Now I moved to another computer, and recompiled CMake 2.8.11.2, and I&#39;m almost back to square one! It always compiles the thing into the `src` folder where my `CMakeLists.txt` is located.

The part where I choose the directory in my CMake script is this:

    set(dir ${CMAKE_CURRENT_SOURCE_DIR}/../Compile/)
    set(EXECUTABLE_OUTPUT_PATH ${dir} CACHE PATH &quot;Build directory&quot; FORCE)
    set(LIBRARY_OUTPUT_PATH ${dir} CACHE PATH &quot;Build directory&quot; FORCE)
    set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${dir})
    set(CMAKE_BUILD_FILES_DIRECTORY ${dir})
    set(CMAKE_BUILD_DIRECTORY ${dir})
    set(CMAKE_BINARY_DIR  ${dir})
    SET(EXECUTABLE_OUTPUT_PATH ${dir})
    SET(LIBRARY_OUTPUT_PATH ${dir}lib)
    SET(CMAKE_CACHEFILE_DIR ${dir})
    

And now it always ends with:

    -- Build files have been written to: /.../src

Am I missing something?

CMake output/build directory

Maven spews out far too many lines of output to my taste (I like the Unix way: no news is good news).

I want to get rid of all `[INFO]` lines, but I couldn&#39;t find any mention of an argument or config settings that controls the verbosity of Maven.

Is there no LOG4J-like way to set the log level?


Can Maven be made less verbose?

Each time I use pushd or popd, it print the stack to standard output. How not to do so?

I don&#39;t want to do `pushd &gt; /dev/null` each time because I have a lot of scripts calling each other.

Maybe a nice override will do it, but I&#39;ll need to override these builtins only in my scripts, and then restore the correct behavior.

Don&#39;t display pushd/popd stack across several bash scripts (quiet pushd/popd)

I am learning C++ and I found something that I can&#39;t understand:

&gt;  Output buffers can be explicitly flushed to force the buffer to be
&gt; written. By default, reading `cin` flushes `cout`; `cout` is also flushed
&gt; when the program ends normally.

So flushing the buffer (for example an output buffer): does this clear the buffer by deleting everything in it or does it clear the buffer by outputting everything in it? Or does flushing the buffer mean something completely different?

What does flushing the buffer mean?

When using the Grep command to find a search string in a set of files, how do I dump the results to a text file?

Also is there a switch for the Grep command that provides cleaner results for better readability, such as a line feed between each entry or a way to justify file names and search results?

For instance, a away to change...

```
./file/path: first result
./another/file/path: second result
./a/third/file/path/here: third result
```

to

```
./file/path: first result

./another/file/path: second result

./a/third/file/path/here: third result
```


Output grep results to text file, need cleaner output

when I do curl to a API call link http://example.com/passkey=wedsmdjsjmdd

    curl &#39;http://example.com/passkey=wedsmdjsjmdd&#39;

I get the employee output data on a csv file format, like:


    &quot;Steve&quot;,&quot;421&quot;,&quot;0&quot;,&quot;421&quot;,&quot;2&quot;,&quot;&quot;,&quot;&quot;,&quot;&quot;,&quot;&quot;,&quot;&quot;,&quot;&quot;,&quot;&quot;,&quot;&quot;,&quot;421&quot;,&quot;0&quot;,&quot;421&quot;,&quot;2&quot;

how can parse through this using python.

I tried:

    import csv 
    cr = csv.reader(open(&#39;http://example.com/passkey=wedsmdjsjmdd&#39;,&quot;rb&quot;))
    for row in cr:
        print row


but it didn&#39;t work and I got an error

`http://example.com/passkey=wedsmdjsjmdd No such file or directory:`


Thanks!

How to read a CSV file from a URL with Python?

I have build errors in my Xcode project (Objective-C), and I no longer &quot;stumble upon&quot; the build command string nor the build output logs. This is Xcode 6.3.1.

All I can inspect is a left-side panel listing errors/warnings.

I want the build command and build console output to compare between two projects; there&#39;s a platform-specific issue present in one but not the other; my intuition says that the build settings are different between the two and that seeing the output would be the easiest way to identify the diff.

How do I get to see the build command string, and, the build output logs in this xcode?

Xcode - how to see build command and log?

I have a set of lists that contain both strings and float numbers, such as:


    import numpy as num

    NAMES  = num.array([&#39;NAME_1&#39;, &#39;NAME_2&#39;, &#39;NAME_3&#39;])
    FLOATS = num.array([ 0.5    , 0.2     , 0.3     ])
    
    DAT =  num.column_stack((NAMES, FLOATS))

I want to stack these two lists together and write them to a text file in the form of columns; therefore, I want to use **numpy.savetxt** (if possible) to do this.

    num.savetxt(&#39;test.txt&#39;, DAT, delimiter=&quot; &quot;) 

When I do this, I get the following error:

    &gt;&gt;&gt; num.savetxt(&#39;test.txt&#39;, DAT, delimiter=&quot; &quot;) 
    Traceback (most recent call last):
      File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
      File &quot;/Library/Python/2.7/site-packages/numpy-1.8.0.dev_9597b1f_20120920-py2.7-macosx-10.8-x86_64.egg/numpy/lib/npyio.py&quot;, line 1047, in savetxt
        fh.write(asbytes(format % tuple(row) + newline))
    TypeError: float argument required, not numpy.string_

The ideal output file would look like:

    NAME_1    0.5
    NAME_2    0.2
    NAME_3    0.3

How can I write both strings and float numbers to a text file, possibly avoiding using csv ( I want to make if readable for other people )? Is there another way of doing this instead of using **numpy.savetxt**?



   

How to use python numpy.savetxt to write strings and float number to an ASCII file?

I want to do some simple logging for my server which is a small Flask app running in a Docker container.

Here is the Dockerfile

    # Dockerfile
    FROM dreen/flask
    MAINTAINER dreen
    WORKDIR /srv

    # Get source
    RUN mkdir -p /srv
    COPY perfektimprezy.tar.gz /srv/perfektimprezy.tar.gz
    RUN tar x -f perfektimprezy.tar.gz
    RUN rm perfektimprezy.tar.gz

    # Run server
    EXPOSE 80
    CMD [&quot;python&quot;, &quot;index.py&quot;, &quot;1&gt;server.log&quot;, &quot;2&gt;server.log&quot;]

As you can see on the last line I redirect stderr and stdout to a file. Now I run this container and shell into it

    docker run -d -p 80:80 perfektimprezy
    docker exec -it &quot;... id of container ...&quot; bash

And observe the following things:

The server is running and the website working

There is no `/srv/server.log`

`ps aux | grep python` yields:

    root         1  1.6  3.2  54172 16240 ?        Ss   13:43   0:00 python index.py 1&gt;server.log 2&gt;server.log
    root        12  1.9  3.3 130388 16740 ?        Sl   13:43   0:00 /usr/bin/python index.py 1&gt;server.log 2&gt;server.log
    root        32  0.0  0.0   8860   388 ?        R+   13:43   0:00 grep --color=auto python

But there are no logs... HOWEVER, if I `docker attach` to the container I can see the app generating output in the console.

How do I properly redirect stdout/err to a file when using Docker?

Redirecting command output in docker

I have the followed imports:

    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;

and the following instantiation:

    private static Logger logger = LoggerFactory.getLogger(Test.class);

and the following in my Main method:

    logger.info(&quot;SOME MESSAGE: &quot;);

However, I&#39;m not able to find the output anywhere. All I see is that in my console there is:

    21:21:24.235 [main] INFO  some_folder.Test - SOME MESSAGE: 

How do I locate the log file?

Note that the following are on my  build path:

`slf4j-api-1.7.5.jar`

`slf4j-log4j12-1.6.4.jar`

I read the answer to similar questions but nobody actually says how to fix the problem.


Where does the slf4j log file get saved?

    Program A()
    {
    	x, y, z: integer;
    
    	procedure B()
    	{
    		y: integer;
    		y=0;
    		x=z+1;
    		z=y+2;
    	}
    
    	procedure C()
    	{
    		z: integer;
    
    		procedure D()
    		{
    			x: integer;
    			x = z + 1;
    			y = x + 1;
    			call B();
    		}
    
    		z = 5;
    		call D();
    	}
    
    	x = 10;
    	y = 11;
    	z = 12;
    	call C();
    	print x, y, z;
    }

From my understanding, the result of this program when run using **static scoping** is: x=13, y=7, and z=2.

However, when it is run using **dynamic scoping**, the result is: x=10, y=7, and z=12.

These results are the ones that our professor gave us. However, I cannot understand for the life of me how he has reached these results. Could someone possibly walk through the pseudocode and explain their values in the two different types of scopes?

Static (Lexical) Scoping vs Dynamic Scoping (Pseudocode)

I have a call to GPG in the following way in a PowerShell script: 

    $key = &amp; &#39;gpg&#39; --decrypt &quot;secret.gpg&quot; --quiet --no-verbose &gt; $null

I don&#39;t want any output from GPG to be seen on the main console when I&#39;m running the script. 

Due to my noobness in PowerShell, I don&#39;t know how to do this. I searched 
Stack&amp;nbsp;Overflow and googled for a way to do it, found a lot of ways to do it, but non of it worked.

The &quot;&gt; $null&quot; for example has no effect. I found the `--quiet --no-verbose` options for GPG to put less output in the console, still it&#39;s not completely quiet, and I&#39;m sure there is a way in PowerShell too.


Suppress console output in PowerShell

How do I print out the contents of a `std::vector` to the screen?


----------


A solution that implements the following `operator&lt;&lt;` would be nice as well:
```
template&lt;container C, class T, String delim = &quot;, &quot;, String open = &quot;[&quot;, String close = &quot;]&quot;&gt;
std::ostream &amp; operator&lt;&lt;(std::ostream &amp; o, const C&lt;T&gt; &amp; x)
{
  // ... What can I write here?
}
```

----------

Here is what I have so far, without a separate function:

    #include &lt;iostream&gt;
    #include &lt;fstream&gt;
    #include &lt;string&gt;
    #include &lt;cmath&gt;
    #include &lt;vector&gt;
    #include &lt;sstream&gt;
    #include &lt;cstdio&gt;
    using namespace std;
    
    int main()
    {
    	ifstream file(&quot;maze.txt&quot;);
    	if (file) {
    		vector&lt;char&gt; vec(istreambuf_iterator&lt;char&gt;(file), (istreambuf_iterator&lt;char&gt;()));
    		vector&lt;char&gt; path;
    		int x = 17;
    		char entrance = vec.at(16);
    		char firstsquare = vec.at(x);
    		if (entrance == &#39;S&#39;) { 
    			path.push_back(entrance); 
    		}
    		for (x = 17; isalpha(firstsquare); x++) {
    			path.push_back(firstsquare);
    		}
    		for (int i = 0; i &lt; path.size(); i++) {
    			cout &lt;&lt; path[i] &lt;&lt; &quot; &quot;;
    		}
    		cout &lt;&lt; endl;
    		return 0;
    	}
    }


How do I print out the contents of a vector?

I use `scipy.optimize` to minimize a function of 12 arguments.

I started the optimization a while ago and still waiting for results.

Is there a way to force `scipy.optimize` to display its progress (like how much is already done, what are the current best point)?

How to display progress of scipy.optimize function?

How can you write to multiple outputs dependent on the key using Spark in a single Job.

Related: https://stackoverflow.com/questions/23994383/write-to-multiple-outputs-by-key-scalding-hadoop-one-mapreduce-job/

E.g.

    sc.makeRDD(Seq((1, &quot;a&quot;), (1, &quot;b&quot;), (2, &quot;c&quot;)))
    .writeAsMultiple(prefix, compressionCodecOption)

would ensure `cat prefix/1` is

    a
    b

and `cat prefix/2` would be

    c


EDIT: I&#39;ve recently added a new answer that includes full imports, pimp and compression codec, see https://stackoverflow.com/a/46118044/1586965, which may be helpful in addition to the earlier answers.


Write to multiple outputs by key Spark - one Spark job

Our (PHP) framework sometimes renders hidden inputs with value `YTowOnt9`. I can&#39;t find that string anywhere in the (huge) codebase, and can&#39;t figure out where it came from. I decided to Google for that particular string, and the [result][1] surprised me. Over half a million - kind of random - hits. I haven&#39;t found any page describing the value itself. It has 0 hits on Stack&amp;nbsp;Overflow. 

Is `YTowOnt9` some kind of magic string?

  [1]: https://www.google.com/?q=%22YTowOnt9%22#q=%22YTowOnt9%22


What is &#39;YTowOnt9&#39;?

It&#39;s possible to send data from the parent to a child through @Input, or to call a method on the parent from the child with @Output, but I&#39;d like to do exactly the other way around, which is calling a method on the child from the parent. Basically something like that:

&lt;!-- language: typescript --&gt;

    @Component({
      selector: &#39;parent&#39;,
      directives: [Child],
      template: `
    &lt;child
      [fn]=&quot;parentFn&quot;
    &gt;&lt;/child&gt;
    `
    })
    class Parent {
      constructor() {
        this.parentFn()
      }
      parentFn() {
        console.log(&#39;Parent triggering&#39;)
      }
    }

and the child:

&lt;!-- language: typescript --&gt;

    @Component({
      selector: &#39;child&#39;,
      template: `...`
    })
    class Child {
      @Input()
      fn() {
        console.log(&#39;triggered from the parent&#39;)
      }

      constructor() {}
    }

Background is a kind of &quot;get&quot; request, i.e. for getting an up-to-date status from the child.

Now I know I could achieve that with a service and Subject/Observable, but I was wondering whether there is not something more straightforward?

Angular 2 - How to trigger a method on a child from the parent

In php, is there any way to clear/remove all previously echoed or printed items?

For example:

    &lt;?php
    
    echo &#39;a&#39;;
    print &#39;b&#39;;
    
    // some statement that removes all printed/echoed items
    
    echo &#39;c&#39;;
    
    // the final output should be equal to &#39;c&#39;, not &#39;abc&#39;
    
    ?&gt;

My script uses the include function. The included files are not supposed to echo anything. Just in case someone (ex = hacker) tries, I need a way to remove.

All Output Solutions on Gang of Coders

Total of 30 Output Solutions