    &#39;Escape a single quote &#39;&#39; using a double single quote&#39;

See the help for [the quoting rules][1].

You can check out the help in the powershell command line by typing:

    Get-Help about_Quoting_Rules

  [1]: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_quoting_rules

It explains that backticks are interpreted literally in single-quoted strings.

&gt; Because the contents of single-quoted strings are interpreted literally, you cannot use the backtick character to force a literal character interpretation in a single-quoted string.

How can I check if a string contains only numbers and alphabets ie. is alphanumeric?

Regex for checking if a string is strictly alphanumeric

If I need to create a couple of nested DOM elements, I know one way to do it, is to write them as long string and then place them in the document using a suitable jQuery function. Something like:

    elem.html(
    &#39;&lt;div class=&quot;wrapper&quot;&gt;
        &lt;div class=&quot;inner&quot;&gt;
            &lt;span&gt;Some text&lt;span&gt;
        &lt;/div&gt;
        &lt;div class=&quot;inner&quot;&gt;
            &lt;span&gt;Other text&lt;span&gt;
        &lt;/div&gt;
    &lt;/div&gt;&#39;); 

This way is obviously not the cleanest. The sting doesn&#39;t take too long to get messy and editing becomes a problem. I much more prefer this notation:

    $(&#39;&lt;div&gt;&lt;/div&gt;&#39;, {
        class : &#39;inner&#39;
    })
    .appendTo( elem );

The problem is I don&#39;t know how to implement it efficiently when creating nested elements on the fly like above. So if there is way to do the 1st example with the 2nd notation, I&#39;ll be glad to learn about it.

Basically, the question is, whats the best way to create nested HTML elements on the fly, without having to deal wit messy long strings?

*Note : I am aware of templating engines. However this is a question concerning the creation of just a couple of HTML elements on the fly. Like while building the DOM dependencies for a plugin or similar cases.*

Best way to create nested HTML elements with jQuery

I want to include an apostrophe in my string. Is it possible to do without using double quotes?

    &#39;This is a quote. Can`&#39;t I just include a single quote in it?&#39;
    &#39;This is another quote that doesn\&#39;t work&#39;


Can I use a single quote in a PowerShell &#39;string&#39;?

I want to include an apostrophe in my string. Is it possible to do without using double quotes?
<pre><code class="hljs language-css">'This is a quote. Can`'t I just include a single quote in it?'
'This is another quote that doesn\'t work'
</code></pre>

In my script I&#39;m about to run a command

    pandoc -Ss readme.txt -o readme.html

But I&#39;m not sure if `pandoc` is installed. So I would like to do (pseudocode)

    if (pandoc in the path)
    {
        pandoc -Ss readme.txt -o readme.html
    }

How can I do this for real?



Test if executable is in path in PowerShell

I want to split each line of a pipe on spaces, and then print each token on its own line.

I realise that I can get this result using:

    (cat someFileInsteadOfAPipe).split(&quot; &quot;)

But I want more flexibility. I want to be able to do just about anything with each token. (I used to use [AWK][1] on Unix, and I&#39;m trying to get the same functionality.)

I currently have:

    echo &quot;Once upon a time there were three little pigs&quot; | %{$data = $_.split(&quot; &quot;); Write-Output &quot;$($data[0]) and whatever I want to output with it&quot;}

Which, obviously, only prints the first token. Is there a way for me to for-each over the tokens, printing each in turn?

Also, the `%{$data = $_.split(&quot; &quot;); Write-Output &quot;$($data[0])&quot;}` part I got from a blog, and I really don&#39;t understand what I&#39;m doing or how the syntax works.

I want to google for it, but I don&#39;t know what to call it. Please help me out with a word or two to Google, or a link explaining to me what the `%` and all the `$` symbols do, as well as the significance of the opening and closing brackets.

I realise I can&#39;t actually use `(cat someFileInsteadOfAPipe).split(&quot; &quot;)`, since the file (or preferable incoming pipe) contains more than one line.

Regarding some of the answers:

If you are using [`Select-String`][2] to filter the output before tokenizing, you need to keep in mind that the output of the `Select-String` command is not a collection of strings, but a collection of `MatchInfo` objects. To get to the string you want to split, you need to access the `Line` property of the `MatchInfo` object, like so:

    cat someFile | Select-String &quot;keywordFoo&quot; | %{$_.Line.Split(&quot; &quot;)}

  [1]: http://en.wikipedia.org/wiki/AWK
  [2]: https://technet.microsoft.com/en-us/library/hh849903.aspx



Split string with PowerShell and do something with each token

What is the required syntax to redirect standard input/output on Windows PowerShell?

On Unix, we use:

    $./program &lt;input.txt &gt;output.txt

How do I execute the same task in PowerShell?


Redirecting standard input\output in Windows PowerShell

As I&#39;m reading in the PowerShell user guide, one of the core PowerShell concepts is that commands accept and return *objects* instead of text. So for example, running `get-alias` returns me a number of `System.Management.Automation.AliasInfo` objects:

&lt;pre&gt;
PS Z:\&gt; get-alias

CommandType     Name                                             Definition
-----------     ----                                             ----------
Alias           %                                                ForEach-Object
Alias           ?                                                Where-Object
Alias           ac                                               Add-Content
Alias           asnp                                             Add-PSSnapIn
Alias           cat                                              Get-Content
Alias           cd                                               Set-Location
Alias           chdir                                            Set-Location
...
&lt;/pre&gt;

Now, **how do I get the count of these objects?**

How to count objects in PowerShell?

Using Powershell v3&#39;s Invoke-WebRequest and Invoke-RestMethod I have succesfully used the POST method to post a json file to a https website.

The command I&#39;m using is

     $cert=New-Object System.Security.Cryptography.X509Certificates.X509Certificate2(&quot;cert.crt&quot;)
     Invoke-WebRequest -Uri https://IPADDRESS/resource -Credential $cred -certificate $cert -Body $json -ContentType application/json -Method POST

However when I attempt to use the GET method like:

     Invoke-WebRequest -Uri https://IPADDRESS/resource -Credential $cred -certificate $cert -Method GET

The following error is returned

     Invoke-RestMethod : The underlying connection was closed: An unexpected error occurred on a send.
     At line:8 char:11
     + $output = Invoke-RestMethod -Uri https://IPADDRESS/resource -Credential $cred
     +           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest)      [Invoke-RestMethod], WebException
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand


I have attempted using the following code to ignore SSL cert, but I&#39;m not sure if its actually doing anything.

     [System.Net.ServicePointManager]::ServerCertificateValidationCallback = {$true}

Can someone provide some guideance on what might be going wrong here and how to fix it?

Thanks


Powershell v3 Invoke-WebRequest HTTPS error

My bash-script looks as following:

    echo &quot;Description:&quot;
    while [ $finishInput -eq 0 ]; do
      read tmp
      desc=&quot;$desc&quot;$&#39;\n&#39;&quot;$tmp&quot;
      if [ -z &quot;$tmp&quot; ]; then
        finishInput=&quot;1&quot;
      fi
    done
    echo -n &quot;Maintainer:&quot;
    read maintainer

It reads to the desc var until a empty line is passed. After that, i want to read in other stuff.

When executing my current script it looks like this:

    Description:
    Line 1
    Line 2
    
    Maintainer:

I would like to overwrite the last empty line with the &quot;Maintainer:&quot;.

I searched for a solution but only found suggestions which were like

    echo -n &quot;Old line&quot;
    echo -e &quot;\r new line&quot;

which stays on the line and overwrites it. This is not possible in my case.

Overwrite last line on terminal

In a config file, I have a key to which I wish to assign a URL.  The problem is that YAML interprets : and - characters as either creating mappings or lists, so it has a problem with the line

    url: http://www.example-site.com/

(both because of the colon following http and the hyphen in the middle)

Is there an explicit way to escape &#39;:&#39; and &#39;-&#39; ?  Or would it work to just put the whole thing in single quotes and call it a day?

How to escape indicator characters (i.e. : or - ) in YAML

I have the following Elastic Search query with only a term filter. My query is much more complex but I am just trying to show the issue here.


    {
    	&quot;filter&quot;: {
            	&quot;term&quot;: {
                    	&quot;field&quot;: &quot;update-time&quot;
                    }
            }
    }

When I pass in a hyphenated value to the filter, I get zero results back. But if I try without an unhyphenated value I get results back. I am not sure if the hyphen is an issue here but my scenario makes me believe so. 

Is there a way to escape the hyphen so the filter would return results? I have tried escaping the hyphen with a back slash which I read from the Lucene forums but that didn&#39;t help. 


Also, if I pass in a GUID value into this field which is hyphenated and surrounded by curly braces, something like - {ASD23-34SD-DFE1-42FWW}, would I need to lower case the alphabet characters and would I need to escape the curly braces too?

Thanks


Elastic Search Hyphen issue with term filter

`grep` can&#39;t be fed &quot;raw&quot; strings when used from the command-line, since some characters need to be escaped to not be treated as literals. For example:

    $ grep &#39;(hello|bye)&#39; # WON&#39;T MATCH &#39;hello&#39;
    $ grep &#39;$hello\|bye$&#39; # GOOD, BUT QUICKLY BECOMES UNREADABLE

I was using `printf` to auto-escape strings:

    $ printf &#39;%q&#39; &#39;(some|group)\n&#39;
    $some\|group$\\n

This produces a bash-escaped version of the string, and using backticks, this can easily be passed to a grep call:

    $ grep `printf &#39;%q&#39; &#39;(a|b|c)&#39;`

However, it&#39;s clearly not meant for this: some characters in the output are not escaped, and some are unnecessarily so. For example:

    $ printf &#39;%q&#39; &#39;(^#)&#39;
    $\^#$

The `^` character should not be escaped when passed to `grep`.

Is there a cli tool that takes a raw string and returns **a bash-escaped version of the string that can be directly used as pattern with grep**? How can I achieve this in pure bash, if not?

Is there an easy way to pass a &quot;raw&quot; string to grep?

   
I am trying to query a certain row by name in my sql database and it has an ampersand. I tried to set an escape character and then escape the ampersand, but for some reason this isn&#39;t working and I&#39;m uncertain as to what exactly my problem is.
 

    Set escape &#39;\&#39;
        select * from V1144engine.T_nodes where node_id in(
        select node2_id from V1144engine.T_edges where node1_id in(
        select node2_id from V1144engine.T_edges where node1_id in(
        select node2_id from V1144engine.T_edges where node1_id = 
          (select node_id from V1144engine.T_nodes where node_name = &#39;Geometric Vectors \&amp; Matrices&#39;)))
        and edge_type_id = 1)
        and node_type_id = 1
        and node_id in (
        select node2_id from V1144engine.T_edges where node1_id =
          (select node_id from V1144engine.T_nodes where node_name = &#39;Algebra II&#39;)
        and edge_type_id = 2);

Although this has a similar solution to [this question][1], the problems are posed very differently. They may end up having the same solution, but that does not mean that the questions are the same.


  [1]: https://stackoverflow.com/questions/118190/how-do-i-ignore-ampersands-in-a-sql-script-running-from-sql-plus

Content Type	Original Author	Original Content on Stackoverflow
Question	Caleb Jares	View Question on Stackoverflow
Solution 1 - Powershell	zdan	View Answer on Stackoverflow

Can I use a single quote in a PowerShell 'string'?

Powershell Problem Overview

Powershell Solutions

Solution 1 - Powershell

Best way to create nested HTML elements with jQuery

Regex for checking if a string is strictly alphanumeric

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