You can use `File.directory?(&quot;name&quot;)` and/or `File.file?(&quot;name&quot;)`.

Also a good idea to check out [`Pathname#directory?`](https://ruby-doc.org/stdlib-1.9.3/libdoc/pathname/rdoc/Pathname.html#method-i-directory-3F) and [`Pathname#file?`](https://ruby-doc.org/stdlib-1.9.3/libdoc/pathname/rdoc/Pathname.html#method-i-file-3F)

I read [here][1] how to check the login status of an user by inside a twig template for a Symfony2-based website.
However, I need to know how to check if the user is logged in from inside a controller. I was quite sure the the following code was right:

    $user = $this-&gt;get(&#39;security.context&#39;)-&gt;getToken()-&gt;getUser();

but it always return something, e.g. a logged user or an anonymous user.

Any idea? Thanks in advance.

  [1]: https://stackoverflow.com/questions/9660764/in-symfony-2-how-do-i-check-if-a-user-is-not-logged-in-inside-a-template

How to check if an user is logged in Symfony2 inside a controller?

How to get the column number from column name in Excel using Excel macro? 

Excel column number from column name

I have a little piece of Ruby code:

    files.each do |file|
      FileUtils.mkdir_p(File.dirname(target))    
      FileUtils.cp_r(file, target, :verbose =&gt; true)
    end

I would like to add a check like

    if file is a folder
      # do this
    if file is a file
      # do that

How do I implement in Ruby?

Check if a filename is a folder or a file

I have a little piece of Ruby code:
<pre><code class="hljs language-arduino">files.each do |file|
 FileUtils.mkdir_p(File.dirname(target)) 
 FileUtils.cp_r(file, target, :verbose => true)
end
</code></pre>
I would like to add a check like
<pre><code class="hljs language-kotlin">if file is a folder
 # do this
if file is a file
 # do that
</code></pre>
How do I implement in Ruby?

&gt; **Possible Duplicate:**  
&gt; [Ruby: Nils in an IF statement](https://stackoverflow.com/questions/5393974/ruby-nils-in-an-if-statement)  
&gt; [Is there a clean way to avoid calling a method on nil in a nested params hash?](https://stackoverflow.com/questions/5429790/is-there-a-clean-way-to-avoid-calling-a-method-on-nil-in-a-nested-params-hash)  

&lt;!-- End of automatically inserted text --&gt;

Let&#39;s say I try to access a hash like this:

    my_hash[&#39;key1&#39;][&#39;key2&#39;][&#39;key3&#39;]

This is nice if key1, key2 and key3 exist in the hash(es), but what if, for example key1 doesn&#39;t exist?

Then I would get `NoMethodError: undefined method [] for nil:NilClass`. And nobody likes that.

So far I deal with this doing a conditional like:

`if my_hash[&#39;key1&#39;] &amp;&amp; my_hash[&#39;key1&#39;][&#39;key2&#39;]` ...

Is this appropriate, is there any other Rubiest way of doing so?

Ruby - Access multidimensional hash and avoid access nil object

I&#39;ve been reading through Thomas&#39; Programming Ruby 1.9 and came upon the alternative delimited single and double-quoting methods (`%q / %Q`). I&#39;ve known of them from other Ruby language references as well.

    %q/I&#39;m acting like a single-quoted string/

    %Q|&quot;I&#39;m acting like a double-quoted string&quot; --Anonymous|

I have not been working with Ruby for long, but I have _never_ encountered this quoting method in production code.

Other than the obvious ability to **avoid internally escaping quotes** with backslashes, what are the common use cases for this method of quoting over regular single or double quotes? Are they typically used in single or multiline strings? If used in multiline strings, are they ever favored over HEREDOC strings? Is there a particular Ruby idiom where they&#39;re commonly found?

What is the use case for Ruby&#39;s %q / %Q quoting methods?

I know how to run a shell command in Ruby like:

    %x[#{cmd}]

But, how do I specify a directory to run this command?

Is there a similar way of shelling out, similar to `subprocess.Popen` in Python:

    subprocess.Popen(r&#39;c:\mytool\tool.exe&#39;, cwd=r&#39;d:\test\local&#39;)


Thanks!


Ruby run shell command in a specific directory

This is a simple one, I hope. 
How do I check, in the following example, if a constant is already defined?

    #this works
    var = var||1
    puts var
    var = var||2
    puts var
    
    #this doesn&#39;t
    CONST = CONST||1
    puts CONST
    CONST = CONST||2
    puts CONST
    
    =&gt; 1
       1
       uninitialized constant CONST (NameError)

Check if a constant is already defined

I was wondering if anyone knew how to do an &quot;IN&quot; clause in activerecord.  Unfortunately, the &quot;IN&quot; clause is pretty much un-googleable so I have to post here.  Basically I want to answer a question like this &quot;Give me all the college students that are in these dormitories where the dormitory id is in this array [id array]&quot;.  I know how to write the query given a single dormitory id, but I don&#39;t know how to do it given an array of ids.

Any help is greatly appreciated.  I&#39;m sure this is a repost of a question somewhere, so I&#39;ll delete this once an answer/better search term is found.

Ruby Activerecord IN clause

I understand that ExternalFiles is to be used on API 8 and up and getExternalStorageDirectory is for 7 and down. However I am a little confused between the use. For example I wanted to check that a folder that exists and previously you would use something like:

    File ChildFolder = new File(Environment.getExternalStorageDirectory() + &quot;/ParentFolder/Child&quot;);

However every example I see says to use getExternalFilesDir (null), File.ext. Since I am above API 8 I want to use this method but how do I just check for a folder? I will check for a files existence at another point but for now just want to see if the folders exist??


Difference between getExternalFilesDir and getExternalStorageDirectory()

    fp = open(&quot;a.txt&quot;)
    #do many things with fp
    
    c = fp.read()
    if c is None:
        print &#39;fp is at the eof&#39;
    
Besides the above method, any other way to find out whether is fp is already at the eof?



How to find out whether a file is at its `eof`?

I have a problem with iterating on a file. Here&#39;s what I type on the interpreter and the result:

    &gt;&gt;&gt; f = open(&#39;baby1990.html&#39;, &#39;rU&#39;)
    &gt;&gt;&gt; for line in f.readlines():
    ...  print(line)
    ... 
    # ... all the lines from the file appear here ...

When I try to iterate on the same open file again I get nothing!

    &gt;&gt;&gt; for line in f.readlines():
    ...  print(line)
    ... 
    &gt;&gt;&gt;

There is no output at all. To solve this I have to `close()` the file then open it again for reading! Is that normal behavior?

Iterating on a file doesn&#39;t work the second time

I&#39;ve seen `.S` files in various projects such as in the Linux Kernel, FreeBSD kernel, or in some other projects.  What do these files do and why can&#39;t we have `.c` files instead ? 

What are .S files?

I want to copy a file from a jar. The file that I am copying is going to be copied outside the working directory. I have done some tests and all methods I try end up with 0 byte files.

**EDIT**: I want the copying of the file to be done via a program, not manually.

Content Type	Original Author	Original Content on Stackoverflow
Question	icn	View Question on Stackoverflow
Solution 1 - Ruby	thelazydeveloper	View Answer on Stackoverflow
Solution 2 - Ruby	mbigras	View Answer on Stackoverflow

Check if a filename is a folder or a file

Ruby Problem Overview

Ruby Solutions

Solution 1 - Ruby

Solution 2 - Ruby

Excel column number from column name

How to check if an user is logged in Symfony2 inside a controller?

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