Execute this

    sort -t _ -k 2 -g data.file

- -t separator
- -k key/column
- -g general numeric sort


I think this is a GNU extension to `sort`, but you&#39;re looking for the `--version-sort` (or `-V`) option:

    $ printf &quot;prefix%d\n&quot; $(seq 10 -3 1)
    prefix10
    prefix7
    prefix4
    prefix1
    
    $ printf &quot;prefix%d\n&quot; $(seq 10 -3 1) | sort
    prefix1
    prefix10
    prefix4
    prefix7
    
    $ printf &quot;prefix%d\n&quot; $(seq 10 -3 1) | sort --version-sort
    prefix1
    prefix4
    prefix7
    prefix10

https://www.gnu.org/software/coreutils/manual/html_node/sort-invocation.html

Try this

    $ cat a.txt
    abc_1
    abc_4
    abc_2
    abc_10
    abc_5
    
    $ sort -V a.txt
    abc_1
    abc_2
    abc_4
    abc_5
    abc_10



We are working on a RESTful Webservice with AngularJS and Java Servlets.
When the user logs in, our backend sends a &quot;Set-Cookie&quot; header to the frontend. In Angular we access the header via `$cookies` (ngCookie - module) and set it.
![enter image description here][1]


Now that the user is logged in he can for example delete some stuff. Therefore the frontend sends a GET request to the backend. Because we work on different domains we need to set some CORS Headers and Angular does an OPTIONS request before the actual GET request:

**OPTIONS request:**
![OPTIONS request][2]

**GET request**
![GET request][3]

We do this in Angular via $http module, but it just won&#39;t send the cookie, containing `JSESSIONID`.

**How can I enable Angular to send cookies?**


  [1]: http://i.stack.imgur.com/ltMrA.png
  [2]: http://i.stack.imgur.com/GKMRf.png
  [3]: http://i.stack.imgur.com/nRnSx.png

$http doesn&#39;t send cookie in Requests

In flask, I can do this:

    render_template(&quot;foo.html&quot;, messages={&#39;main&#39;:&#39;hello&#39;})

And if foo.html contains `{{ messages[&#39;main&#39;] }}`, the page will show `hello`. But what if there&#39;s a route that leads to foo:

    @app.route(&quot;/foo&quot;)
    def do_foo():
        # do some logic here
        return render_template(&quot;foo.html&quot;)

In this case, the only way to get to foo.html, if I want that logic to happen anyway, is through a `redirect`:

    @app.route(&quot;/baz&quot;)
    def do_baz():
        if some_condition:
            return render_template(&quot;baz.html&quot;)
        else:
            return redirect(&quot;/foo&quot;, messages={&quot;main&quot;:&quot;Condition failed on page baz&quot;}) 
            # above produces TypeError: redirect() got an unexpected keyword argument &#39;messages&#39;

So, how can I get that `messages` variable to be passed to the `foo` route, so that I don&#39;t have to just rewrite the same logic code that that route computes before loading it up?

redirect while passing arguments

I&#39;ve often wanted to sort strings with numbers in them so that, when sorting e.g.  `abc_2, abc_1, abc_10` the result is `abc_1, abc_2, abc_10`. Every sort mechanism I&#39;ve seen sorts as `abc_1, abc_10, abc_2`, that is character by character from the left. 

Is there any efficient way to sort to get the result I want? The idea of looking at every character, determining if it&#39;s a numeral, building a substring out of subsequent numerals and sorting on that as a number is too appalling to contemplate in `bash`.

Has no bearded *nix guru implemented an alternative version of `sort` with a `--sensible_numerical` option?

Sorting strings with numbers in Bash

I've often wanted to sort strings with numbers in them so that, when sorting e.g. <code>abc_2, abc_1, abc_10</code> the result is <code>abc_1, abc_2, abc_10</code>. Every sort mechanism I've seen sorts as <code>abc_1, abc_10, abc_2</code>, that is character by character from the left.
Is there any efficient way to sort to get the result I want? The idea of looking at every character, determining if it's a numeral, building a substring out of subsequent numerals and sorting on that as a number is too appalling to contemplate in <code>bash</code>.
Has no bearded *nix guru implemented an alternative version of <code>sort</code> with a <code>--sensible_numerical</code> option?

I am trying to create a timestamp variable in a shell script to make the logging a little easier. I want to create the variable at the beginning of the script and have it print out the current time whenever I issue `echo $timestamp`. It proving to be more difficult then I thought. Here are some things I&#39;ve tried:

`timestamp=&quot;(date +&quot;%T&quot;)&quot;` echo prints out `(date +&quot;%T&quot;)`

`timestamp=&quot;$(date +&quot;%T&quot;)&quot;` echo prints the time when the variable was initialized.

Other things I&#39;ve tried are just slight variations that didn&#39;t work any better. Does anyone know how to accomplish what I&#39;m trying to do?

Create timestamp variable in bash script

I&#39;ve got the following bash two scripts

a.sh:

    #!/bin/bash
    ./b.sh &#39;My Argument&#39;

b.sh:

    #!/bin/bash
    someApp $*

The someApp binary receives `$*` as 2 arguments (&#39;My&#39; and &#39;Argument&#39;) instead of 1.

I&#39;ve tested several things:

 - Running someApp only thru `b.sh` works as expected
 - Iterate+echo the arguments in `b.sh` works as expected
 - Using `$@` instead of `$*` doesn&#39;t make a difference

Passing arguments with spaces between (bash) script

I have a text file:

    1 Q0 1657 1 19.6117 Exp
    1 Q0 1410 2 18.8302 Exp
    2 Q0 3078 1 18.6695 Exp
    2 Q0 2434 2 14.0508 Exp
    2 Q0 3129 3 13.5495 Exp

I want to take the 2nd and 4th word of every line like this:

    1657 19.6117
    1410 18.8302
    3078 18.6695
    2434 14.0508
    3129 13.5495

I&#39;m using this code:

     nol=$(cat &quot;/path/of/my/text&quot; | wc -l)
     x=1
     while  [ $x -le &quot;$nol&quot; ]
     do
         line=($(sed -n &quot;$x&quot;p /path/of/my/text)
         echo &quot;&quot;${line[1]}&quot; &quot;${line[3]}&quot;&quot;  &gt;&gt; out.txt
         x=$(( $x + 1 ))
     done

It works, but it is very complicated and takes a long time to process long text files.

Is there a simpler way to do this?

Take nth column in a text file

How does one use a variable in a bash for loop?
If I just use a standard for loop, it does what I expect

    for i in {0..3}
    do
       echo &quot;do some stuff $i&quot;
    done

This works fine.  It loops thru 4 times, 0 to 3 inclusive, printing my message and putting the count at the end.

    do some stuff 0
    do some stuff 1
    do some stuff 2
    do some stuff 3

When I try the same thing with the following for loop, it seems to equal a string, which is not what i want.

    length=3
    for i in {0..$length}
    do
       echo &quot;do something right $i&quot;
    done

output:
 
    do something right {0..3}

I&#39;ve tried 

    for i in {0..&quot;$length&quot;} and for i in {0..${length}} (both output was {0..3})

and

    for i in {0..&#39;$length&#39;} (output was {0..$length})

and they both don&#39;t do what I need.  Hopefully someone can help me.  Thanks in advance for any bash expert&#39;s help with for loops.


How to use variables in a bash for loop

I just found out about the bash extglob shell option here:-
https://stackoverflow.com/questions/216995/how-can-i-use-inverse-or-negative-wildcards-when-pattern-matching-in-a-unix-linu

All the answers that used `shopt -s extglob` also mentioned `shopt -u extglob` to turn it off.
Why would I want to turn something so useful off? Indeed why isn&#39;t it on by default?
Presumably it has the potential for giving some nasty surprises. 
What are they?


Why would I not leave extglob enabled in bash?

Suppose I have a dataframe with columns `a`, `b` and `c`, I want to sort the dataframe by column `b` in ascending order, and by column `c` in descending order, how do I do this?

How to sort a dataFrame in python pandas by two or more columns?

As you probably know most symbols are sorted before the alphabetical letters.

I am looking for one character that is easy to enter from the keyboard that would be sorted after &quot;z&quot; by most sort implementations.

If this is also an ASCII character, the better :)

Any ideas?

Simple to enter Unicode character that would sort after Z in most cases?

I&#39;m trying to understand a few sorting algorithms, but I&#39;m struggling to see the difference in the bubble sort and insertion sort algorithm.

I know both are O(n&lt;sup&gt;2&lt;/sup&gt;), but it seems to me that bubble sort just bubbles the maximum value of the array to the top for each pass, while insertion sort just sinks the lowest value to the bottom each pass. Aren&#39;t they doing the exact same thing but in different directions?

For insertion sort, the number of comparisons/potential swaps starts at zero and increases each time (ie 0, 1, 2, 3, 4, ..., n) but for bubble sort this same behaviour happens, but at the end of the sorting (ie n, n-1, n-2, ... 0) because bubble sort no longer needs to compare with the last elements as they are sorted.

For all this though, it seems a consensus that insertion sort is better in general. Can anyone tell me why?

Edit: *I&#39;m primarily interested in the differences in how the algorithms work, not so much their efficiency or asymptotic complexity.*

Insertion sort vs Bubble Sort Algorithms

&gt; This question is intended as a reference for questions about sorting arrays in PHP. It is easy to think that your particular case is unique and worthy of a new question, but most are actually minor variations of one of the solutions on this page.
&gt;
&gt; If your question is closed as a duplicate of this one, please ask for your question to be reopened only if you can explain why it differs markedly from all of the below.

How do I sort an array in PHP?  
How do I sort a *complex* array in PHP?  
How do I sort an array of objects in PHP?


----------

1. [Basic one-dimensional arrays; Incl. Multidimensional arrays, incl. arrays of objects; Incl. Sorting one array based on another](https://stackoverflow.com/a/17364128/476)

2. [Sorting with SPL](https://stackoverflow.com/a/17364468/476)

3. [Stable sort](https://stackoverflow.com/a/17365409)

For the practical answer using PHP&#39;s existing functions see 1., for the academic in-detail answer on sorting algorithms (which PHP&#39;s functions implement and which you *may* need for really, really complex cases), see 2.

How can I sort arrays and data in PHP?

***See edit at end for actual problem.***

Ok, I have this scenario:

    a = [false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, false, true, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false]

Then if I do this:

    a.sort(function(a,b){return !a &amp;&amp; b});

It gives me this:

    [false, false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, false, true, false, false, false, false, false, false, true, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false]

It&#39;s sorta doing a sort... but not quite... :(

How do I sort this array?

EDIT:

***If you are wondering why I did not use just a.sort() is because my actual array is of objects, not a plain array like the one I posted. The real one has elements that look like [{xx:true},{xx:false},...]***

Javascript sort array of objects by a boolean property

I have the following input tag in my html5 form:

    &lt;p&gt;
        &lt;label&gt;Company Name*&lt;/label&gt;
        &lt;input type=&quot;text&quot; name=&quot;name&quot; class=&quot;field&quot; required pattern=&quot;[a-zA-Z0-9]+&quot; /&gt;
    &lt;/p&gt;

This works just fine checking if the company name consists out of alphanumeric characters. But of course I want to allow spaces in the company name. I need to know what I should add to the pattern.

HTML5 form validation pattern alphanumeric with spaces?

I&#39;m looking for a neat regex solution to replace

 - All non alphanumeric characters
 - All newlines
 - All multiple instances of white space

With a single space

---

For those playing at home (**the following does work**)

    text.replace(/[^a-z0-9]/gmi, &quot; &quot;).replace(/\s+/g, &quot; &quot;);

My thinking is *regex* is probably powerful enough to achieve this in one statement. The components I think I&#39;d need are

 - `[^a-z0-9]` - to remove non alphanumeric characters 
 - `\s+` - match any collections of spaces
 - `\r?\n|\r` - match all new line
 - `/gmi` - global, multi-line, case insensitive

However, I can&#39;t seem to style the regex in the right way (**the following doesn&#39;t work**)

    text.replace(/[^a-z0-9]|\s+|\r?\n|\r/gmi, &quot; &quot;);

---

**Input**

    234&amp;^%,Me,2 2013 1080p x264 5 1 BluRay
    S01(*&amp;asd 05
    S1E5
    1x05
    1x5

---

**Desired Output**

    234 Me 2 2013 1080p x264 5 1 BluRay S01 asd 05 S1E5 1x05 1x5


Content Type	Original Author	Original Content on Stackoverflow
Question	hardcode57	View Question on Stackoverflow
Solution 1 - Bash	Grzegorz Żur	View Answer on Stackoverflow
Solution 2 - Bash	glenn jackman	View Answer on Stackoverflow
Solution 3 - Bash	Bill	View Answer on Stackoverflow

Sorting strings with numbers in Bash

Bash Problem Overview

Bash Solutions

Solution 1 - Bash

Solution 2 - Bash

Solution 3 - Bash

redirect while passing arguments

$http doesn't send cookie in Requests

Attributions