If Ruby is installed, then

    ruby yourfile.rb

where `yourfile.rb` is the file containing the ruby code.

Or
   
    irb

to start the interactive Ruby environment, where you can type lines of code and see the results immediately.

You can run ruby commands in one line with the `-e` flag:

    ruby -e &quot;puts &#39;hi&#39;&quot;

Check the [man page](http://linux.die.net/man/1/ruby) for more information.

I am new to Git and I am using EGit eclipse plugin to commit.

I modified few files and I stashed the changes, then I did `git pull` in command line which pulled up all the latest commits. Then I did `Apply stashed changes` from EGit. Now it applied my changes and the changes which pulled from last commit of stashed files went out. I am not sure why it didn&#39;t ask me about merge conflicts and overwrote my changes and lost previous commits changes. 

How to get those changes?

git stash and git pull

So, I&#39;ve got a function that returns a number of records that I want to implement paging for on my website.  It was suggested to me that I use the Offset/Fetch Next in SQL Server 2012 to accomplish this.  On our website, we have an area that lists total number of records and what page you&#39;re on at the time.

Before, I was getting the entire record set and was able to build the paging on that programatically.  But using the SQL way with FETCH NEXT X ROWS ONLY, I am only given back X rows, so I don&#39;t know what my total record set is and how to calculate my min and max pages.  The only way I can tell of doing this is calling the function twice and doing a count of rows on the first, then running the second with FETCH NEXT.  Is there a better way that won&#39;t have me running the query twice?  I am trying to speed up performance, not slow it down.

Getting total row count from OFFSET / FETCH NEXT

I need to run a few lines of Ruby code from terminal, but I can&#39;t find the needed parameter for it.

Can you explain how to do this?


How to run Ruby code from terminal?

<p>I need to run a few lines of Ruby code from terminal, but I can't find the needed parameter for it.</p>
<p>Can you explain how to do this?</p>


In a model there is a field

    validates :image_file_name, :format =&gt; { :with =&gt; %r{\.(gif|jpg|jpeg|png)$}i

It looks pretty odd for me. I am aware that this is a regular expression. But I would like:
  

 - to know what exactly it means. Is `%r{value}` equal to `/value/` ?
 - be able to replace it with normal Ruby regex operator `/some regex/` or `~=`. Is it possible?

The Ruby %r{ } expression

I would like to format a string containing float variables including them with a fixed amount of decimals, and I would like to do it with this kind of formatting syntax:

    amount = Math::PI
    puts &quot;Current amount: #{amount}&quot;

and I would like to obtain `Current amount: 3.14`.

I know I can do it with 

    amount = Math::PI
    puts &quot;Current amount %.2f&quot; % [amount]

but I am asking if it is possible to do it in the `#{}` way.

How to format a string with floats in Ruby using #{variable}?

I&#39;m trying to work out how to get the current line/row number from Ruby CSV. This is my code:

    options = {:encoding =&gt; &#39;UTF-8&#39;, :skip_blanks =&gt; true}
    CSV.foreach(&quot;data.csv&quot;, options, ) do |row, i|
       puts i
    end

But this doesn&#39;t seem to work as expected. Is there a way to do this?


Ruby CSV - get current line/row number

I am using a logic operator in Jekyll but it&#39;s not working.

Page one, two and three all use the same layout (part of a multilingual solution, works good but requires logical loops for some layout control to keep things DRY.)

Here&#39;s the code:

    {% if page.type == &quot;post&quot; %}
    {% include post.html %}
    {% elseif page.class == &quot;contact&quot; %}
    {% include contact.html %}
    {% else %}
    {{ content }}
    {% endif %}

If I break it down to just an `else` and an `if else` setup, with any two of the tree, everything works. But as soon as I use a third condition it breaks. Am I limited to two conditionals with Jekyll? I can potentially restructure to make a `case` operator applicable, but I&#39;d prefer to understand the fundamental problem here. Thanks all.

How do I chain if statements in Jekyll?

I have a string in Ruby on which I&#39;m calling the strip method to remove the leading and trailing whitespace. e.g.

    s = &quot;12345 &quot;
    s.strip

However if the string is &lt;strike&gt;empty&lt;/strike&gt; `nil` I get the following error. 

    NoMethodError: undefined method `strip&#39; for nil:NilClass

I&#39;m using Ruby 1.9 so whats the easiest way to check if the value is `nil` before calling the strip method?

**Update:**

I tried this on an element in an array but got the same problem:

    data[2][1][6].nil? ? data[2][1][6] : data[2][1][6].split(&quot;:&quot;)[1].strip


Ruby check if nil before calling method

For example, my terminal does this:

    $ echo -e &quot;\xE2\x98\xA0&quot;
    ���

I expect it to do this:

    $ echo -e &quot;\xE2\x98\xA0&quot;
    ☠

Why? How do I make my terminal output the proper unicode symbols?

I&#39;m using Gnome 3&#39;s Terminal on Arch Linux.

The output of `locale` shows:

    LANG=C
    LC_CTYPE=&quot;C&quot;
    LC_NUMERIC=&quot;C&quot;
    LC_TIME=&quot;C&quot;
    LC_COLLATE=&quot;C&quot;
    LC_MONETARY=&quot;C&quot;
    LC_MESSAGES=&quot;C&quot;
    LC_PAPER=&quot;C&quot;
    LC_NAME=&quot;C&quot;
    LC_ADDRESS=&quot;C&quot;
    LC_TELEPHONE=&quot;C&quot;
    LC_MEASUREMENT=&quot;C&quot;
    LC_IDENTIFICATION=&quot;C&quot;
    LC_ALL=


Why doesn&#39;t my terminal output unicode characters properly?

I have several JS files so instead of copy and paste every one in the console window (Firefox and Chromium), I would want to call them from the shell if it is possible.

Every JS file has test functions that show if they are correct using console.log.

Is it possible to run JavaScript files from the command line?

I use &#39;forever&#39; to run my application. I want to attach to the running environment to inspect my application. So what can I do?  

Node.js: How to attach to a running process and to debug the server with a console?

If I, say, loop through all the instances of a given model and output something from each, at the end, irb will still print the entire object. 

If the object ends up taking hundreds of lines, it&#39;ll be a long way up before I see what I was actually looking for. Is there a way to disable this in the rails console?

Stop rails console from printing out the object at the end of a loop

I don&#39;t know why this code prints to the screen, but not to the file? File &quot;example1.log&quot; is created, but nothing is written there.

    #!/usr/bin/env python3
    import logging
    
    logging.basicConfig(level=logging.DEBUG,
                        format=&#39;%(asctime)s %(message)s&#39;,
                        handlers=[logging.FileHandler(&quot;example1.log&quot;),
                                  logging.StreamHandler()])
    logging.debug(&#39;This message should go to the log file and to the console&#39;)
    logging.info(&#39;So should this&#39;)
    logging.warning(&#39;And this, too&#39;)

I have &quot;bypassed&quot; this problem by creating a logging object, but it keeps bugging me why `basicConfig()` approach failed?

PS. If I change basicConfig call to:

    logging.basicConfig(level=logging.DEBUG,
                        filename=&quot;example2.log&quot;,
                        format=&#39;%(asctime)s %(message)s&#39;,
                        handlers=[logging.StreamHandler()])

then all logs are in the file and nothing is displayed in the console.

Python using basicConfig method to log to console and file

couldn&#39;t find this on SO. I ran the following command in the terminal: 

    &gt;&gt; grep -Rl &quot;curl&quot; ./
and this displays the list of files where the keyword curl occurs. I want to count the number of files. First way I can think of, is to count the number of lines in the output that came in the terminal. How can I do that?

count number of lines in terminal output

Not sure if this is zsh, iterm2 or the interaction between them.
Trying to change the number of recallable lines in the terminal - not the command history, the output history.

In .zshrc I have :

    HISTFILE=~/.histfile
    HISTSIZE=100000
    SAVEHIST=100000

This seems to be ignored =(

Not sure of the correct term to google, &quot;Terminal output history?&quot;

ZSH iterm2 increase number of lines history

 I&#39;m trying to run a `bash script` on my Ubuntu machine and it is giving me an error: 

&gt; function not found


To test, I created the following script which works fine on my laptop but not on my Desktop.  Any ideas as to why?  My laptop is a mac if that&#39;s relevant.

    #!/bin/bash
    
    function sayIt {   
       echo &quot;hello world&quot;
    }
    
    sayIt

This returns &quot;hello world&quot; on my laptop, but on my Desktop it returns:

&gt; run.sh: 3: function not found  hello world   run.sh: 5: Syntax error:
&gt; &quot;}&quot; unexpected


Bash script error: &quot;function: not found&quot;. Why would this appear?

I want to change the *rpath* of an executable using `install_name_tool`, but I can&#39;t figure out what the *rpath* is right now. `install_name_tool` requires both the old and the new *rpath*&#39;s to be given on the commandline. What command can I use to print the *rpath* of an executable under macOS?

Print rpath of an executable on macOS

I saw [this project][1] that basically opens a new terminal window from sublime text-2.&lt;br&gt;
What I&#39;m looking for is a way to open the terminal **inside** sublime text 2 via console.&lt;br&gt;
Does anyone knows how can I do that?


  [1]: http://wbond.net/sublime_packages/terminal

Content Type	Original Author	Original Content on Stackoverflow
Question	Andresh Podzimovsky	View Question on Stackoverflow
Solution 1 - Ruby	theglauber	View Answer on Stackoverflow
Solution 2 - Ruby	LanguagesNamedAfterCofee	View Answer on Stackoverflow

How to run Ruby code from terminal?

Ruby Problem Overview

Ruby Solutions

Solution 1 - Ruby

Solution 2 - Ruby

Getting total row count from OFFSET / FETCH NEXT

git stash and git pull

Attributions