If you are talking about show line number command in **[vi/vim][1]**

you could use 

&gt; set nu

 in commandline mode to turn on and 

&gt;set nonu

will turn off the line number display or

&gt; set nu!

 to toggle off display of line numbers


  [1]: http://vim.wikia.com/wiki/Display_line_numbers

Display line numbers:

    :set nu

Stop showing the line numbers:

    :set nonu
Its short for :set nonumber

ps. These commands are to be run in normal mode.



To turn off line numbering, again follow the preceding instructions, except this time enter the following line at the  :  prompt:

  

    set nonumber

For turning off line numbers, any of these commands will work:

1. :set nu!
2. :set nonu
3. :set number!
4. :set nonumber

**Easily Display Line number:**

&gt;set number flag (to show line number type)

`:set nu` **or** `:set number`

&gt;to unset the number flag (hide the line number type)

    :set nu!

**If you need number every time you start `vi/vim`, append following line to your `~/.vimrc` file:**

    set number

**Open a file at particular location/line number**

    $ vi +linenumber file.rb
    $ vi +300 initlib.rb 

From the Document &quot;[Mastering the VI editor][1]&quot;:

    number (nu)
    Displays lines with line numbers on the left side.


  [1]: http://www.emerson.emory.edu/services/editors/vi/vi.html

`set number`
`set nonumber `

**DO** work inside `.vimrc` and make sure you DO NOT precede commands in `.vimrc` with `:` 


write command in terminal:  
&lt;pre&gt;vi ~/.vimrc&lt;/pre&gt;  
  
for set the number:  
write **set number**    

for remove number:  
write **set nonumber**

    set nonumber
    set norelativenumber

If you are using some vim bundles.

I&#39;ve just install Redis succesfully using the instructions on the Quick Start guide on http://redis.io/topics/quickstart on my Ubuntu 10.10 server. I&#39;m running the service as  dameon (so it can be run by init.d)

The server is part of Rackspace Cluster with Internal and External IPs. The host is running on port 6379 (standard for Redis)

I&#39;ve added a row in the iptables to allow incoming connections from port 6379 as shown below:

     ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:6379 

In my PHP code on another server, I&#39;m trying to connect to the new Redis server here:

    $this-&gt;load-&gt;helper(&quot;iredis&quot;);
		
    $hostname = &quot;IP ADDRESS HERE&quot;;
		
    $redis = new iRedis(array(&#39;hostname&#39; =&gt; $hostname, &#39;port&#39; =&gt; 6379));


Once I do this - I always get a connection refused. In my    redis.conf   file, I have the local bind command commented out, so it should be listening on more than the localhost IP. I can connect to the database on the local machine just not on another server. I&#39;ve tried the external and internal IPs with no luck.

Any suggestions on getting this to work?

Redis - Connect to Remote Server

I am using an init script to run a simple process, which is started with:

    start-stop-daemon --start --quiet --chuid $DAEMONUSER    \
        --make-pidfile --pidfile $PIDFILE --background       \
        --exec $DAEMON $DAEMON_ARGS

The process called $DAEMON usually prints log information to its standard output.  As far as I can tell this data is not being stored anywhere.

I would like to write or append the stdout of $DAEMON to a file somewhere.

The only solution I know is to tell start-stop-daemon to call a shellscript instead of $DAEMON directly; the script then calls $DAEMON and writes to the logfile.  But that requires an extra script which, like modifying the daemon itself, seems the wrong way to solve such a common task.

How can I log the stdout of a process started by start-stop-daemon?

For displaying line numbers in a file, I use command:

    set numbers

What is the command to clear line numbers from the file?

How to take off line numbers in Vi?

<p>For displaying line numbers in a file, I use command:</p>
<pre><code class="hljs language-arduino">set numbers
</code></pre>
<p>What is the command to clear line numbers from the file?</p>


I&#39;ve been using Vim as my primary editor for years and tried Emacs several times during that time. Then I discovered [Evil](https://gitorious.org/evil/pages/Home) and decided that it meets my demand for speedy movement well enough that I can finally move on to Emacs.

So, to all you Evil users, how do you integrate it with normal Emacs functions? Have you encountered any conflicts between this mode and others? What&#39;s your sharing-worthy experiences/tips on this topic?

Evil Mode best practice?

How can I undo all changes since opening a buffer? I imagine there may be some form of `:earlier` that does this.

**UPDATE**: Many are suggesting solutions for traversing to earlier file writes. This isn&#39;t what I asked for. I want to return to the original state the file was in when I originally loaded it into a buffer, no matter how many writes were made since then.

Undo all changes since opening buffer in vim

I have a problem setting Sublime Text 2 as the `core.editor` with `git`.

I&#39;ve read through every post I could find addressing the problem, but still nothing is working for me. I am running Windows.

I have done:

    git config --global core.editor &quot;&#39;C:/Program Files/Sublime Text 2/sublime_text.exe&#39;&quot;

and tried that with various arguments like `-m`.  When I open my `.gitconfig`, this is what is in there:

    [user]
	    name = Spencer Moran
	    email = smoran02@gmail.com
    [core]
	    editor = &#39;C:/Program Files/Sublime Text 2/sublime_text.exe&#39;


If I go to Git and type:

    README.markdown --edit

the README file opens in Notepad, not Sublime Text.

Does anyone have any idea what I&#39;m doing wrong or how I could fix this?


How can I make Sublime Text the default editor for Git?

How can I set TextMate as default text editor on Mac OS X?

I&#39;ve tried it with

    ln -s /Applications/TextMate.app/Contents/Resources/mate ~/bin/mate
    export EDITOR=&#39;mate -w&#39;

but that doesn&#39;t work.


Set TextMate as the default text editor on Mac OS X

Is there a way to force Sublime Text 2 to always indent two spaces per tab when working with Ruby files?

I know that indentation can be set under the `view -&gt; indentation` menu option, but it does not stick. Every time I open a new file and hit tab, it reverts back to four spaces.

How do I force Sublime Text to indent two spaces per tab?

For `&lt;input type=&quot;number&quot;&gt;` element, `maxlength` is not working. How can I restrict the `maxlength` for that number element?

How can I set max-length in an HTML5 &quot;input type=number&quot; element?

How can I generate non-repetitive random numbers in numpy?

    list = np.random.random_integers(20,size=(10))

Non-repetitive random number in numpy

I am trying hard to compare two floating point numbers within a Bash script. I have two variables, e.g.

    let num1=3.17648e-22
    let num2=1.5

Now, I just want do a simple comparison of these two numbers:

    st=`echo &quot;$num1 &lt; $num2&quot; | bc`
    if [ $st -eq 1]; then
      echo -e &quot;$num1 &lt; $num2&quot;
    else
      echo -e &quot;$num1 &gt;= $num2&quot;
    fi

Unfortunately, I have some problems with the right treatment of the num1 which can be of the &quot;e-format&quot;.




How can I compare two floating point numbers in Bash?

I need to loop some values,

    for i in $(seq $first $last)
    do
        does something here
    done


For `$first` and `$last`, i need it to be of fixed length 5. So if the input is `1`, i need to add zeros in front such that it becomes `00001`. It loops till `99999` for example, but the length has to be 5.

E.g.: `00002`, `00042`, `00212`, `012312` and so forth.

Any idea on how i can do that? 

How to zero pad a sequence of integers in bash so that all have the same width?

How do I format a floating number to a fixed width with the following requirements:

&lt;ol&gt;
&lt;li&gt;Leading zero if n &amp;lt; 1&lt;/li&gt;
&lt;li&gt;Add trailing decimal zero(s) to fill up fixed width&lt;/li&gt;
&lt;li&gt;Truncate decimal digits past fixed width&lt;/li&gt;
&lt;li&gt;Align all decimal points&lt;/li&gt;
&lt;/ol&gt;

For example:

    % formatter something like &#39;{:06}&#39;
    numbers = [23.23, 0.123334987, 1, 4.223, 9887.2]
    
    for number in numbers:
        print formatter.format(number)

The output would be like

      23.2300
       0.1233
       1.0000
       4.2230
    9887.2000

How to format a floating number to fixed width in Python

Is there a command which shows what was the last command in normal mode?

Suppose I accidently hit random key and got some unexpected result.
Sure I can undo it, but could I reveal what key was pressed and how it was interpreted?


Vim &quot;show my last command&quot; command?

In Vim, when I hit the `backspace` key in the `insert` mode, it leaves `^?` character and does not delete the character it is suppose to delete. 

I have the following in my `.vimrc`

    syntax on
    set number
    set expandtab
    set incsearch
    set nocompatible
    set backspace=indent,eol,start
    fixdel

This happens in the command mode too. When I wrongly type `W` instead of `w` to save, I press `backspace` key and it gives me the following:

    :W^?

Any idea on whats wrong and how to fix it?!

UPDATE: before posting this question to SO, I have done a basic google search and tried all the suggestion from the first page of search result but unsuccessful. 

@strcat I&#39;m using vim version 7.0.237, KDE console 1.6.4, Linux 2.6.18 x86_64 machine.

@graywh w.r.t cat -v, for delete, I get `^[[3~` and for backspace, I get `^?`. 

The output of `stty -a` is as follows 

    speed 38400 baud; rows 38; columns 194; line = 0;
    intr = ^C; quit = ^\; erase = ^H; kill = ^U; eof = ^D; eol = &lt;undef&gt;; eol2 = &lt;undef&gt;; swtch = &lt;undef&gt;; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; flush = ^O;
    min = 1; time = 0;
    -parenb -parodd cs8 -hupcl -cstopb cread -clocal -crtscts -cdtrdsr
    -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl -ixon -ixoff -iuclc -ixany -imaxbel iutf8
    opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
    isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke


vim backspace leaves ^?

Is there a way to generate a number sequence in vi or Vim? 

For example, for an arbitrary range of lines *i* &#160;through&#160;*j* (where *i*&#160;&lt;&#160;*j*) in a file opened in Vim, is there a way to generate a number sequence from&#160;number 1 on line&#160;*i* all the way through number (*j*&#160;−&#160;*i*&#160;+&#160;1) on line&#160;*j*?

Say, I have the following lines in a file:

    this is line #1
    this is line #2
    this is line #3
    this is line #4
    this is line #5
    this is line #6
    this is line #7
    this is line #8
    this is line #9
    this is line #10

I want to prefix the number sequence from line&#160;4 to line&#160;8 with numbers&#160;1 through&#160;5. After the operation, the resulting file should be as follows:

    this is line #1
    this is line #2
    this is line #3
    1 this is line #4
    2 this is line #5
    3 this is line #6
    4 this is line #7
    5 this is line #8
    this is line #9
    this is line #10

If this is possible, is there a way to use different step sizes for the generated sequence? For example, can 2 be used for the step size instead, so that the resulting sequence is 2, 4, 6, 8, etc.?

**Note:** The question “[How to add line numbers to range of lines in Vim?](https://stackoverflow.com/questions/252766/add-line-numbers-in-vim)” brings up a similar problem, but it is not the same.


How to generate a number sequence in file using vi or Vim?

For ages now I&#39;ve used &lt;kbd&gt;SHIFT&lt;/kbd&gt;&lt;kbd&gt;O&lt;/kbd&gt; and &lt;kbd&gt;SHIFT&lt;/kbd&gt;&lt;kbd&gt;$&lt;/kbd&gt; to move to the beginning and end of a line in `vi`.

However &lt;kbd&gt;SHIFT&lt;/kbd&gt;&lt;kbd&gt;O&lt;/kbd&gt; is more for opening a new line above the cursor.  

Is there any command which just takes you to the start of a line?


Go to beginning of line without opening new line in VI

I can `:set number` from within a file I&#39;m editing but how can I have them always be on by default?

Content Type	Original Author	Original Content on Stackoverflow
Question	user710818	View Question on Stackoverflow
Solution 1 - Editor	Narayan	View Answer on Stackoverflow
Solution 2 - Editor	Alex	View Answer on Stackoverflow
Solution 3 - Editor	Jugal Shah	View Answer on Stackoverflow
Solution 4 - Editor	Matt	View Answer on Stackoverflow
Solution 5 - Editor	Kaleem Ullah	View Answer on Stackoverflow
Solution 6 - Editor	CloudyMarble	View Answer on Stackoverflow
Solution 7 - Editor	charles	View Answer on Stackoverflow
Solution 8 - Editor	Yash Shah	View Answer on Stackoverflow
Solution 9 - Editor	dezhi	View Answer on Stackoverflow

How to take off line numbers in Vi?

Editor Problem Overview

Editor Solutions

Solution 1 - Editor

Solution 2 - Editor

Solution 3 - Editor

Solution 4 - Editor

Solution 5 - Editor

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Solution 9 - Editor

How can I log the stdout of a process started by start-stop-daemon?

Redis - Connect to Remote Server

Attributions