This will locate all files with the given extensions in the current working directory and all subdirectories: 

    dir *.cpp *.h *.java /b/s

See https://technet.microsoft.com/en-us/library/cc755121.aspx for more info on using `dir`.

findstr /p /s /i &lt;TextToBeSearch&gt; .

above command searches for the given text in current directories and sub directories. 
/n will print the line numbers too.

I am trying to make a simple page with the following characteristics:

1. Its body must be at least 60em wide.
2. Its left and right margins must be equally wide and at most 3em wide.
3. When the browser window is resized, the document&#39;s margins should be resized so that the browser window&#39;s horizontal scrollbar covers the least wide possible range.

Transforming these requirements into a linear programming problem, we get:

    DEFINITIONS:
    BRWS = (width of the browser window, not a variable)
    BODY = (width of the document&#39;s body)
    LRMG = (width of the document&#39;s left and right margins)
    HSCR = (range of the browser window&#39;s horizontal scroll bar)
    
    OBJECTIVE:
    MIN HSCR   /* Third requirement */
    
    CONSTRAINTS:
    HSCR = BODY + 2*LRMG - BRWS  /* From the definition of how a browser&#39;s
                                  * horizontal scrollbar works. */
    BODY &gt;= 60  /* First requirement */
    LRMG &lt;= 3   /* Second requirement */
    LRMG &gt;= 0   /* Physical constraint, margins cannot be negative */
    HSCR &gt;= 0   /* Physical constraint, scroll bars cannot have negative ranges */

Solving this linear program, we get:

    BODY = (BRWS &lt;= 66) ? 60 : (BRWS - 6)
    HSCR = (BRWS &gt;= 60) ?  0 : (60 - BRWS)
    LRMG = (BRWS + HSCR - BODY) / 2

(Sorry for the boring math, but I am not confident that the original explanation in English was clear enough.)

---

Now back to the actual page. After googling to find what I could do with CSS, I managed to implement the first two requirements using the following code:

    body {
      min-width: 60em; /* First requirement */
    }

    /* The document&#39;s body has only two children, both of which are divs. */
    body &gt; div {
      margin: 0 3em;    /* Second requirement, but in a way that makes */
      max-width: 100%;  /* it impossible to satisfy the third one. */
    }

If CSS had a `max-margin` property, satisfying all requirements would be easy:

    body &gt; div {
      max-margin: 0 3em;
      max-width: 100%;
    }

But, of course, `max-margin` does not exist. How could I fake it?

I need a max-margin CSS property, but it doesn&#39;t exist. How could I fake it?

I&#39;m learning Haskell, and came across the following code:

    fibs = 0 : 1 : zipWith (+) fibs (tail fibs)

which I&#39;m having a bit of trouble parsing, in terms of how it works. It&#39;s very neat, I understand that nothing more is needed, but I&#39;d like to understand how Haskell manages to &quot;fill in&quot; fibs when I write:

    take 50 fibs

Any help?

Thanks!

Understanding a recursively defined list (fibs in terms of zipWith)

While having a cygwin installed in windows gives most of unix command, still i was wondering how to search multiple filetypes in one command using windows &quot;find&quot; command.  
ie:   `find . -name *.cpp -o -name *.h -o -name *.java`

The above command gives me a list of all cpp, h &amp; java, what will be the equivalent using the windows find?

Windows equivalent for Unix find command to search multiple file types

While having a cygwin installed in windows gives most of unix command, still i was wondering how to search multiple filetypes in one command using windows "find" command. 
ie: <code>find . -name *.cpp -o -name *.h -o -name *.java</code>
The above command gives me a list of all cpp, h &#x26; java, what will be the equivalent using the windows find?

I need .pfx file to install https on website on IIS. 

I have two separate files: certificate (.cer or pem) and private key (.crt) but IIS accepts only .pfx files.


I obviously installed certificate and it is available in certificate manager (mmc) but when I select Certificate Export Wizard I cannot select PFX format (it&#39;s greyed out)

Are there any tools to do that or C# examples of doing that programtically?

How to create .pfx file from certificate and private key?

I&#39;ve been trying to add the Python path to the command line on Windows, yet no matter the method I try, nothing seems to work. I&#39;ve used the `set` command, I&#39;ve tried adding it through the Edit Environment Variables prompt, etc.

Furthermore, if I run the set command on the command line it lists this.

    python = c:\python27

Yet it still doesn&#39;t recognize the Python command.

Reading the documentation, and various other sources haven&#39;t seemed to help.

Just to clarify further, I&#39;ve appended the path of the Python executable to PATH in the Edit Environment prompt. Doesn&#39;t seem to work.

Adding Python to PATH on Windows

I am trying to build our web project from the commandline but skipping the testing. I am using the command `mvn clean install -Dmaven.test.skip=true`.

When I run the command from the traditional black &amp; white Command Prompt (aka DOS shell) the command works, but when I run it from the command from &quot;Windows PowerShell&quot; I get the following error:

`[ERROR] Unknown lifecycle phase &quot;.test.skip=true&quot;. You must specify a valid lifecycle phase or a goal in the format &lt;plugin-prefix&gt;:&lt;goal&gt; or &lt;plugin-group-id&gt;:&lt;plugin-
artifact-id&gt;[:&lt;plugin-version&gt;]:&lt;goal&gt;. Available lifecycle phases are: validate, initialize, generate-sources, process-sources, generate-resources, process-resources,
compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepar
e-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy, pre-site, site, post-site, site-deploy, pre-clean, clean, po
st-clean. -&gt; [Help 1]`

What is causing this discrepancy and how do I get PowerShell to behave like the traditional Command Prompt?

This is running on Windows 7. 

Cannot run Maven using `mvn -D` argument within Microsoft Powershell, but works in Command Prompt

Is it possible to set a statement&#39;s output of a batch file to a variable, for example:

    findstr testing &gt; %VARIABLE%
    
    echo %VARIABLE%

How to set commands output as a variable in a batch file

I need a conversion utility/script that will convert a .sql dump file generated on Mac to one readable on Windows.  This is a continuation of a problem I had [here][1].  The issue seems to be with newline formatting in text files, but I can&#39;t find a tool to make the conversion...


  [1]: https://stackoverflow.com/questions/6372578/error-importing-mysql-data-across-platforms-mamp-to-wimp

Converting newline formatting from Mac to Windows

Rename all the files within a folder with prefix `&quot;Unix_&quot;` 

Suppose a folder has two files 

    a.txt
    b.pdf

then they both should be renamed from a single command to 

    Unix_a.txt
    Unix_b.pdf

Rename all files in a folder with a prefix in a single command

When running scripts in bash, I have to write `./` in the beginning:

    $ ./manage.py syncdb

If I don&#39;t, I get an error message:

    $ manage.py syncdb
    -bash: manage.py: command not found

What is the reason for this? I thought `.` is an alias for current folder, and therefore these two calls should be equivalent.

I also don&#39;t understand why I don&#39;t need `./` when running applications, such as:

    user:/home/user$ cd /usr/bin
    user:/usr/bin$ git

(which runs without `./`)

Why do you need ./ (dot-slash) before executable or script name to run it in bash?

I have a file of two columns and `n` number of rows.

column 1 contains `names` and column2 `age`.

I want to sort the content of this file in ascending order based on the `age` (in second column).

The result should display the `name` of the youngest person along with `name` and then second youngest person and so on...

Any suggestions for a one liner shell or bash script.


Sorting data based on second column of a file

Unix processes have a _session id_ and are part of a _process group_ - which can be changed/queried with functions such as `setsid()`/`getpgrp()`. 

However the concept of a _process group_ and _session_ always eluded me, could anybody explain what significance having distinct sessions and process groups provide - why/when do one want to create a new session or place several processes in the same session and/or process group ?


Use and meaning of session and process group in Unix?

I want to traverse all subdirectories, except the &quot;node_modules&quot; directory.

How can I exclude directories from grep -R?

I have seen lots of ways of running Perl code or scripts, with different flags. However, when I try to google for what each flag means, I mainly get results to generic Perl sites and no specific information regarding the flags or their use is found there.

Below are the flags that I encounter most often, and I don&#39;t have a clue what they mean:

 - perl **-pe**
 - perl **-pi**
 - perl **-p**
 - perl **-w**
 - perl **-d**
 - perl **-i**
 - perl **-t**

I will be very grateful if you tell me what each of those mean and some use cases for them, or at least tell me a way of finding out their meaning.


Perl flags -pe, -pi, -p, -w, -d, -i, -t?

Say I want to kill every process containing the word amarok. I can print out the commands I want to execute. But how do I actually make the shell execute them. ie.

    ps aux | grep -ie amarok | awk &#39;{print &quot;kill -9 &quot; $2}&#39;
    Output:
    kill -9 3052
    kill -9 3071
    kill -9 3076
    kill -9 3077
    kill -9 3079
    kill -9 3080
    kill -9 3082
    kill -9 3083
    kill -9 3084
    kill -9 3085
    kill -9 3086
    kill -9 3087
    kill -9 3088
    kill -9 3089
    kill -9 4031

How to kill all processes matching a name?

I am trying to automate database creation process with a shell script and one thing I&#39;ve hit a road block with passing a password to [psql][1].
Here is a bit of code from the shell script:

    psql -U $DB_USER -h localhost -c&quot;$DB_RECREATE_SQL&quot;

How do I pass a password to `psql` in a non-interactive way?

  [1]: https://en.wikipedia.org/wiki/PostgreSQL#Database_administration


How do I specify a password to &#39;psql&#39; non-interactively?

In Linux, how can I find all `*.js` files in a directory recursively?  The output should be an absolute path (like `/pub/home/user1/folder/jses/file.js`)



**this answer worked for me:**

    find $PWD -name &#39;*.js&#39; &gt; out.txt

It finds all *.js files, output absolute path, writes the results into out.txt.

How can I find all *.js file in directory recursively in Linux?

I&#39;d like to find commits in my code base that add video files to throw them out.
Is there a way to look for these files in git ?

For example let&#39;s say all videos have a filename ending with the extension .wmv ; I&#39;d like to find all commits introducing these files and get rid of them with a fixup or something.

Any ideas ?

Find commits that modify file names matching a pattern in a GIT repository

I am having a hard time getting **find** to look for matches in the current directory as well as its subdirectories. 

When I run `find *test.c` it only gives me the matches in the current directory. (does not look in subdirectories)

If I try `find . -name *test.c` I would expect the same results, but instead it gives me only matches that are in a subdirectory. When there are files that should match in the working directory, it gives me: `find: paths must precede expression: mytest.c` 

What does this error mean, and how can I get the matches from both the current directory and its subdirectories?

&quot;find: paths must precede expression:&quot; How do I specify a recursive search that also finds files in the current directory?

Suppose I have a file similar to the following:

    123 
    123 
    234 
    234 
    123 
    345

I would like to find how many times &#39;123&#39; was duplicated, how many times &#39;234&#39; was duplicated, etc.
So ideally, the output would be like:

    123  3 
    234  2 
    345  1


Find duplicate lines in a file and count how many time each line was duplicated?

I need to remove element that have `value=&quot;123&quot;`. I know that all elements with different values are located into `#attached_docs`, but I don&#39;t know how to select element with `value=&quot;123&quot;`.

    $(&#39;#attached_docs&#39;).find ... .remove();

Can you help me?

How to find elements with &#39;value=x&#39;?

`ls /home/user/new/*.txt` prints all txt files in that directory. However it prints the output as follows:

    [me@comp]$ ls /home/user/new/*.txt
    /home/user/new/file1.txt    /home/user/new/file2.txt    /home/user/new/file3.txt

and so on.

I want to run the `ls` command not from the `/home/user/new/` directory thus I have to give the full directory name, yet I want the output to be only as

    [me@comp]$ ls /home/user/new/*.txt
    file1.txt    file2.txt    file3.txt 

I don&#39;t want the entire path. Only filename is needed. This issues has to be solved using ls command, as its output is meant for another program.

To show only file name without the entire directory path

Here&#39;s how one might list all files matching a pattern in bash:

    ls *.jar

How to list the complement of a pattern? i.e. all files not matching *.jar?

List files not matching a pattern?

I want to use ls in windows command prompt and make it run the dir command.

How can I do that?

How to create ls in windows command prompt?

I am using `ls -l -t` to get a list of files in a directory ordered by time. 

I would like to limit the search result to the top 2 files in the list.&lt;br/&gt;
Is this possible?&lt;br/&gt;
I&#39;ve tried with grep and I struggled.

first two results from ls command

This command lists directories in the current path: `ls -d */`

What exactly does the pattern `*/` do?

And how can we give the absolute path in the above command (e.g. `ls -d /home/alice/Documents`) for listing only directories in that path?

Content Type	Original Author	Original Content on Stackoverflow
Question	Soumen	View Question on Stackoverflow
Solution 1 - Windows	JAB	View Answer on Stackoverflow
Solution 2 - Windows	Sreedhar GS	View Answer on Stackoverflow

Windows equivalent for Unix find command to search multiple file types

Windows Problem Overview

Windows Solutions

Solution 1 - Windows

Solution 2 - Windows

Understanding a recursively defined list (fibs in terms of zipWith)

I need a max-margin CSS property, but it doesn't exist. How could I fake it?

Attributions