I solved that problem by setting the Command Line Tools in Xcode. Go to:

&gt; Xcode &gt; Preferences &gt; Locations

And select the command line tool from the dropdown. If you have only one version of Xcode installed, there should be only one option. If you have several versions of Xcode, then you must choose the one you need.

**Update (added image for reference)**

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/JnRDU.png

# The simplest fix is from CLI:

`sudo xcode-select -s /Applications/Xcode.app/Contents/Developer`

*(this should be path to your Xcode.app)*

 
By the way this can happen even if you have only one version of Xcode . It happens when you instal `homebrew` before the first Xcode installation (which makes sense because you may want to install Xcode through `mas install 497799835` and `mas` needs `homebrew`).

sudo xcode-select -s /Applications/Xcode.app/Contents/Developer. Worked for me


I have a dynamic DataFrame which works fine, but when there are no data to be added into the DataFrame I get an error. And therefore I need a solution to create an empty DataFrame with only the column names.

For now I have something like this:

    df = pd.DataFrame(columns=COLUMN_NAMES) # Note that there are now row data inserted.

PS: It is important that the column names would still appear in a DataFrame.

But when I use it like this I get something like that as a result:

    Index([], dtype=&#39;object&#39;)
    Empty DataFrame

The &quot;Empty DataFrame&quot; part is good! But instead of the Index thing I need to still display the columns.

Edit:

An important thing that I found out: I am converting this DataFrame to a PDF using Jinja2, so therefore I&#39;m calling out a method to first output it to HTML like that:

    df.to_html()

This is where the columns get lost I think.

Edit2:
In general, I followed this example: http://pbpython.com/pdf-reports.html. The css is also from the link.
That&#39;s what I do to send the dataframe to the PDF:

    env = Environment(loader=FileSystemLoader(&#39;.&#39;))
    template = env.get_template(&quot;pdf_report_template.html&quot;)
    template_vars = {&quot;my_dataframe&quot;: df.to_html()}

    html_out = template.render(template_vars)
    HTML(string=html_out).write_pdf(&quot;my_pdf.pdf&quot;, stylesheets=[&quot;pdf_report_style.css&quot;])

Edit3:

If I print out the dataframe right after creation I get the followin:
   
    [0 rows x 9 columns]
    Empty DataFrame
    Columns: [column_a, column_b, column_c, column_d, 
    column_e, column_f, column_g, 
    column_h, column_i]
    Index: []

That seems reasonable, but if I print out the template_vars:

    &#39;my_dataframe&#39;: &#39;&lt;table border=&quot;1&quot; class=&quot;dataframe&quot;&gt;\n  &lt;tbody&gt;\n    &lt;tr&gt;\n      &lt;td&gt;Index([], dtype=\&#39;object\&#39;)&lt;/td&gt;\n      &lt;td&gt;Empty DataFrame&lt;/td&gt;\n    &lt;/tr&gt;\n  &lt;/tbody&gt;\n&lt;/table&gt;&#39;

And it seems that the columns are missing already.

E4:
If I print out the following:

    print(df.to_html())

I get the following result already:

    &lt;table border=&quot;1&quot; class=&quot;dataframe&quot;&gt;
      &lt;tbody&gt;
        &lt;tr&gt;
          &lt;td&gt;Index([], dtype=&#39;object&#39;)&lt;/td&gt;
          &lt;td&gt;Empty DataFrame&lt;/td&gt;
        &lt;/tr&gt;
      &lt;/tbody&gt;
    &lt;/table&gt;

    

Pandas create empty DataFrame with only column names

I have lots of code in Swift 2.x (or even 1.x) projects that looks like this:

    // Move to a background thread to do some long running work
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
        let image = self.loadOrGenerateAnImage()
        // Bounce back to the main thread to update the UI
        dispatch_async(dispatch_get_main_queue()) {
            self.imageView.image = image
        }
    }

Or stuff like this to delay execution:

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, Int64(0.5 * Double(NSEC_PER_SEC))), dispatch_get_main_queue()) {
        print(&quot;test&quot;)
    }

Or any of all kinds of other uses of the Grand Central Dispatch API...

Now that I&#39;ve opened my project in Xcode 8 (beta) for Swift 3, I get all kinds of errors. Some of them offer to fix my code, but not all of the fixes produce working code. What do I do about this?



How do I dispatch_sync, dispatch_async, dispatch_after, etc in Swift 3, Swift 4, and beyond?

I am getting this error while building the `SwiftJSON` framework to the Some Xcode project through Carthage Dependency Manager.



&gt; Sivaramaiahs-Mac-mini:GZipDemoApp vsoftMacmini5$ carthage update
&gt; --platform iOS
&gt; 
&gt; *** Fetching GzipSwift
&gt; 
&gt; *** Fetching SwiftyJSON
&gt; 
&gt; *** Checking out GzipSwift at &quot;3.1.1&quot;
&gt; 
&gt; *** Downloading SwiftyJSON.framework binary at &quot;3.1.3&quot;
&gt; 
&gt; 
&gt; *** xcodebuild output can be found in /var/folders/7m/y0r2mdhn0f16zz1nlt34ypzr0000gn/T/carthage-xcodebuild.apLXCc.log
&gt; 
&gt; A shell task (/usr/bin/xcrun xcodebuild -project
&gt; /Users/vsoftMacmini5/Desktop/GZipDemoApp/Carthage/Checkouts/GzipSwift/Gzip.xcodeproj
&gt; CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY= CARTHAGE=YES -list)
&gt; failed with exit code 72:
&gt; 
&gt; xcrun: error: unable to find utility &quot;xcodebuild&quot;, not a developer
&gt; tool or in PATH



Command Line Tool - Error - xcrun: error: unable to find utility &quot;xcodebuild&quot;, not a developer tool or in PATH

<p>I am getting this error while building the <code>SwiftJSON</code> framework to the Some Xcode project through Carthage Dependency Manager.</p>
<p>> Sivaramaiahs-Mac-mini:GZipDemoApp vsoftMacmini5$ carthage update
> --platform iOS
>
> *** Fetching GzipSwift
>
> *** Fetching SwiftyJSON
>
> *** Checking out GzipSwift at "3.1.1"
>
> *** Downloading SwiftyJSON.framework binary at "3.1.3"
>
>
> *** xcodebuild output can be found in /var/folders/7m/y0r2mdhn0f16zz1nlt34ypzr0000gn/T/carthage-xcodebuild.apLXCc.log
>
> A shell task (/usr/bin/xcrun xcodebuild -project
> /Users/vsoftMacmini5/Desktop/GZipDemoApp/Carthage/Checkouts/GzipSwift/Gzip.xcodeproj
> CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY= CARTHAGE=YES -list)
> failed with exit code 72:
>
> xcrun: error: unable to find utility "xcodebuild", not a developer
> tool or in PATH</p>


Why do we need to prefix JVM arguments with `-D` e.g. when running a jar from the command line? E.g.

    java -jar -DmyProp=&quot;Hello World&quot; myProgram.jar

is used to run `myProgram.jar` with the system parameter `myProp`. So why the leading `-D`? Why couldn&#39;t the architects of Java let us simply do:

    java -jar -myProp=&quot;Hello World&quot; myProgram.jar

I&#39;m hoping for an answer beyond just &quot;Because that&#39;s the way it is&quot;. 

**Bonus Question:** Why the letter `-D` as opposed to any other letter, does it stand for anything?

----

**Note:** This question asks *why* there was a need to use &quot;D&quot;, or any other letter for that matter, in the first place. It is less concerned with the choice of specific letter &quot;D&quot; over any other letter, though that is asked as a bonus question.

The bonus question has an answer here: https://stackoverflow.com/questions/12518728/in-java-d-what-does-the-d-stand-for.

Why do JVM arguments start with &quot;-D&quot;?

I&#39;ve been looking at the following article about Headless Chrome:  
https://developers.google.com/web/updates/2017/04/headless-chrome

I just upgraded Chrome on Windows 10 to version 60, but when I run either of the following commands from the command line, nothing seems to happen:

    chrome --headless --disable-gpu --dump-dom https://www.google.com/
    chrome --headless --disable-gpu --print-to-pdf https://www.google.com/

And I&#39;m running all of these commands from the following path (the default installation path for Chrome on Windows):

    C:\Program Files (x86)\Google\Chrome\Application\

When I run the commands, something seems to process for a second, but I don&#39;t actually see anything. What am I doing wrong?  
Thanks.

---

**Edit:**

As noted by Mark Rajcok, if you add `--enable-logging` to the `--dump-dom` command, it works. Also, the `--print-to-pdf` command works as well in Chrome 61.0.3163.79, but you&#39;ll probably have to specify a different path for the output file in order to have the necessary permissions to save it.

As such, the following two commands worked for me:

    &quot;C:\Program Files (x86)\Google\Chrome\Application\chrome&quot; --headless --disable-gpu --enable-logging --dump-dom https://www.google.com/
    &quot;C:\Program Files (x86)\Google\Chrome\Application\chrome&quot; --headless --disable-gpu --print-to-pdf=D:\output.pdf https://www.google.com/

I guess the next step is being able to step through the dumped DOM like PhantomJS with DOM selectors and whatnot, but I suppose that&#39;s a separate question.

---

**Edit #2:**

For what it&#39;s worth, I recently came across a Node API for Headless Chrome called Puppeteer (https://github.com/GoogleChrome/puppeteer), which is really easy to use and delivers all the power of Headless Chrome. If you&#39;re looking for an easy way to use Headless Chrome, I highly recommend it.

How do I use Headless Chrome in Chrome 60 on Windows 10?

I&#39;m trying to learn Angular and my knowledge in terminal is beginner. After I installed Angular and then type `ng new my-project`. I get the response `ng: command not found`. I&#39;ve seen other posts that had this problem and I&#39;ve uninstalled and reinstalled *npm* and *ng*. 
&gt;The last step I took was npm install -g @angular/cli@latest then ng new my-project. 

Then I get `ng: command not found`.

Angular - ng: command not found

How can I stop all docker containers running on Windows?

`docker stop` is for 1 container only.

Any command/script to make it stop all containers?

Stop all docker containers at once on Windows

Updated answer (7/10/2021): For AWS CLI v1, do this:

```bash
export AWS_DEFAULT_PROFILE=user2
```

For AWS CLI v2, the following will work:

```bash
export AWS_PROFILE=user2
```

The full question is below for context:

----------

(1.) After successfully configuring a second profile for the AWS CLI, I unsuccessfully tried to set the profile to user2 in my bash session with the following command:

    export AWS_PROFILE=user2

... per the advice here: https://docs.aws.amazon.com/cli/latest/userguide/cli-multiple-profiles.html

(2.) The following command works: 

```bash
aws s3 ls --profile user2
```

So I know that the AWS CLI and the user2 profile are both working on my computer.

(3.) However, when I subsequently (that is, after entering &quot;export AWS_PROFILE=user2&quot;) try something like:

```bash
aws s3 ls
```

... AWS&#39;s response assumes that I want to query it as the default user (NOT user2)

(4.) So the only way I can use the user2 profile from the command line is by continuing to append &quot;--profile user2&quot; to every single command, which is tedious.


(5.)

```bash
echo $AWS_PROFILE
```

yields:

```bash
&gt;&gt; user2
```

, as expected.


Any idea what&#39;s going on here? I&#39;m sure I&#39;m making some dumb mistake somewhere.

How to temporarily switch profiles for AWS CLI?

**Steps:**
1) I Opened the android application (built with `cordova`)

2) Then I called [`cordova-webintent`][1] for installing updates


3) I pressed Install and it starts installing, but after a few seconds, the app force stops and shuts instead of installing and opening the updated app.

This problem appeared some time ago and I can&#39;t understand why this happened, because the version of `cordova-webintent` and `cordova` are the same.

4) After the app force stopped, I tapped on the application icon, but there is a message that &quot;App isn&#39;t installed&quot;. The app continues installing in the background after some seconds. I tapped again on the application icon and the updated application opened.

Why is the app force stopping while installing?

Logs:

    E:\work\hello1&gt;adb logcat ActivityManager:I com.example.hello1:D *:S
    
    --------- beginning of system
    
    I/ActivityManager(  715): [Background Service Priority Adjustment] Set callerFg as false for service.getFlags():260
    
    I/ActivityManager(  715): START u0 {act=android.intent.action.VIEW dat=file:///storage/emulated/0/filename1.apk typ=application/vnd.android.package-archive cmp=com.android.packageinstaller/.PackageInstallerActivity} from uid 10657 on display 0
    
    --------- beginning of main
    
    I/ActivityManager(  715): START u0 {dat=file:///storage/emulated/0/filename1.apk cmp=com.android.packageinstaller/.InstallAppProgress (has extras)} from uid 10072 on display 0
    I/ActivityManager(  715): [AppLaunch] Displayed Displayed com.android.packageinstaller/.InstallAppProgress: +135ms
    
    I/ActivityManager(  715): Force stopping com.example.hello1 appid=10657 user=-1: uninstall pkg
    
    I/ActivityManager(  715): Killing 19149:com.example.hello1/u0a657 (adj 1): stop com.example.hello1
    
    W/ActivityManager(  715): notify app switch quit packageName=com.example.hello1
    I/ActivityManager(  715):   Force finishing activity ActivityRecord{16a2ad7e u0 com.example.hello1/.MainActivity t2758}
    
    I/ActivityManager(  715):   Force finishing activity ActivityRecord{32eb6933 u0 com.android.packageinstaller/.InstallAppProgress t2758}
    
    **W/ActivityManager(  715): Spurious death for ProcessRecord{2590ad4d 19149:com.example.hello1/u0a657}, curProc for 19149: null**
    
    I/ActivityManager(  715): Force stopping com.example.hello1 appid=10657 user=-1: update pkg
    I/ActivityManager(  715): Force stopping com.example.hello1 appid=10657 user=0: pkg removed


  [1]: https://github.com/Initsogar/cordova-webintent

Android app starts updating with cordova-webintent and force stops

I try to install PIL but get errors, what should I do?

    $ Command
    Result
    ------------
    $ pip install PIL
    
    Collecting PIL
      Could not find a version that satisfies the requirement PIL (from versions: )
    No matching distribution found for PIL
    --------------------------------------------------------------------
    $ pip install PIL  --allow-unverified PIL --allow-all-external
    
    DEPRECATION: --allow-all-external has been deprecated and will be removed in the future. Due to changes in the repository protocol, it no longer has any effect.
    DEPRECATION: --allow-unverified has been deprecated and will be removed in the future. Due to changes in the repository protocol, it no longer has any effect.
    Collecting PIL
      Could not find a version that satisfies the requirement PIL (from versions: )
    No matching distribution found for PIL

Get error when try to install PIL

I am working on a Java project with gradlew. I use Ubuntu Linux as my OS. When I run &quot;gradle&quot; it runs, and gives me info. But when I run &quot;gradlew&quot;, it outputs as &quot;No command &#39;gradlew&#39; found, did you mean:
 Command &#39;gradle&#39; from package &#39;gradle&#39; (universe)
gradlew: command not found&quot;

I did my research, I have jdk, and I did sudo apt-get install gradle. I am totally clueless


Error is:
```
$ gradlew clean jpackage
bash: gradlew: command not found...
```

gradlew command not found?

I was trying to set default python version to `python3` in `Ubuntu 16.04`. By default it is `python2` (2.7). I followed below steps :  

    update-alternatives --remove python /usr/bin/python2
    update-alternatives --install /usr/bin/python python /usr/bin/python3

but I&#39;m getting the following error for the second statement,    

    rejeesh@rejeesh-Vostro-1015:~$ update-alternatives --install /usr/bin/python python /usr/bin/python3
    update-alternatives: --install needs &lt;link&gt; &lt;name&gt; &lt;path&gt; &lt;priority&gt;
    
    Use &#39;update-alternatives --help&#39; for program usage information.   

I&#39;m new to Ubuntu and Idon&#39;t know what I&#39;m doing wrong.



Unable to set default python version to python3 in ubuntu

Please help me with this error

I have installed the tensorflow module on my server and below is it&#39;s information

	15IT60R19@cpusrv-gpu-109:~$ pip show tensorflow
	Name: tensorflow
	Version: 1.0.0
	Summary: TensorFlow helps the tensors flow
	Home-page: http://tensorflow.org/
	Author: Google Inc.
	Author-email: opensource@google.com
	License: Apache 2.0
	Location: /home/other/15IT60R19/anaconda2/lib/python2.7/site-packages
	Requires: mock, numpy, protobuf, wheel, six

But when I try to import tensorflow I get following error

	&gt;&gt;&gt; import tensorflow as tf
	Traceback (most recent call last):
	  File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
	ImportError: No module named tensorflow

My python version is as following

	Python 2.7.12 |Anaconda 2.5.0 (64-bit)| (default, Jul  2 2016, 17:42:40) 
	[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux2
	Type &quot;help&quot;, &quot;copyright&quot;, &quot;credits&quot; or &quot;license&quot; for more information.
	Anaconda is brought to you by Continuum Analytics.
	Please check out: http://continuum.io/thanks and https://anaconda.org
I have tried the solutions given in 
[sol1][1]


[Sol2][2]


  [1]: https://stackoverflow.com/questions/40472144/importerror-no-module-named-tensorflow-cant-install-tensorflow
  [2]: https://stackoverflow.com/questions/41658793/tensorflow-installation-issuesimporterror-no-module-named-tensorflow

I do not have sudo access to the server 
I can only use pip to install any module

ImportError: No module named tensorflow

What&#39;s the difference between marking a method as @objc vs dynamic, when would you do one vs the other?

Below is Apple&#39;s definition for dynamic.

&gt; dynamic Apply this modifier to any member of a class that can be
&gt; represented by Objective-C. When you mark a member declaration with
&gt; the dynamic modifier, access to that member is always dynamically
&gt; dispatched using the Objective-C runtime. Access to that member is
&gt; never inlined or devirtualized by the compiler.
&gt; 
&gt; Because declarations marked with the dynamic modifier are dispatched
&gt; using the Objective-C runtime, they’re implicitly marked with the objc
&gt; attribute.

Swift 3 - dynamic vs @objc

I have a button &quot;take a photo&quot; and when pressed, it opens the camera, you take a photo and when you select &quot;Use Photo&quot;, I want it saved to the photo library.  

I am able to do all but save to the library. This is the code I have to open the camera:

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/BZuTo.png

Take a photo and save to photo library in Swift

In my application I added one object in array when select cell and unselect and remove object when re-select cell. I used that code but give me error.

	extension Array {
		func indexOfObject(object : AnyObject) -&gt; NSInteger {
			return (self as NSArray).indexOfObject(object)
		}
		
	    mutating func removeObject(object : AnyObject) {
			for var index = self.indexOfObject(object); index != NSNotFound; index = self.indexOfObject(object) {
				self.removeAtIndex(index)
			}
		}
	}
    
    class MyViewController: UITableViewController {
        var arrContacts: [Any] = []
        var contacts: [Any] = []
        
        func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
    		arrContacts.removeObject(contacts[indexPath.row])
    	}
    }

It gives me 2 error like that:

    C-style for statement has been removed in Swift 3
    Value of type &#39;[Any]&#39; has no member &#39;removeObject&#39;


Removing object from array in Swift 3

I am trying to set up an app with send email option.

I have this code:

    import Foundation
    import MessageUI
    import UIKit

    class emailClass: UIViewController, MFMailComposeViewControllerDelegate {
        override func viewDidLoad() {
            super.viewDidLoad()

            if !MFMailComposeViewController.canSendMail() {
                print(&quot;Mail services are not available&quot;)
                return
            }        
            sendEmail() 
        }
    
        func sendEmail() {      
            let composeVC = MFMailComposeViewController()
            composeVC.mailComposeDelegate = self
            // Configure the fields of the interface.
            composeVC.setToRecipients([&quot;address@example.com&quot;])
            composeVC.setSubject(&quot;Hello!&quot;)
            composeVC.setMessageBody(&quot;Hello this is my message body!&quot;, isHTML: false)
            // Present the view controller modally.
            self.present(composeVC, animated: true, completion: nil)
        }
    
        func mailComposeController(controller: MFMailComposeViewController,
                               didFinishWithResult result: MFMailComposeResult, error: NSError?) {
            // Check the result or perform other tasks.
            // Dismiss the mail compose view controller.
            controller.dismiss(animated: true, completion: nil)
        }
 
        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }
    }

So I get this message: &quot;Mail services are not available&quot;.
Now I&#39;ve logged in the simulator device in iCloud... So i think it should do it but it&#39;s not. Why isn&#39;t this working? Can you tell me whats wrong and how can I move forward?


Sending an email from swift 3

I am getting a &#39;**Type of expression is ambiguous without more context** &#39; on this part of code from a project I am trying to upgrade to latest Swift version. I can&#39;t seem to figure it out. I tried different things but can&#39;t get it to work.

The problem is on the syntax of this line 

    let imageToDeleteParameters  = imagesToDelete.map { [&quot;id&quot;: $0.id, &quot;url&quot;: $0.url.absoluteString, &quot;_destroy&quot;: true] }

Full code:

    extension TutorialCreationRequest: WebserviceParametrable {
        func toParameters() -&gt; [String: AnyObject] {
            let imageParameters = images.map { [&quot;url&quot;: $0] }
            let imageToDeleteParameters  = imagesToDelete.map { [&quot;id&quot;: $0.id, &quot;url&quot;: $0.url.absoluteString, &quot;_destroy&quot;: true] }
            return [
                &quot;title&quot;: title,
                &quot;is_draft&quot;: isDraft,
                &quot;difficulty&quot;: difficulty,
                &quot;duration&quot;: duration,
                &quot;cost&quot;: cost,
                &quot;user_id&quot;: userId,
                &quot;description&quot;: description,
                &quot;to_sell&quot;: toSell,
                &quot;images&quot;: [imageParameters, imageToDeleteParameters].flatMap { $0 }
            ]
        }
    }

Type of expression is ambiguous without more context Swift

How do I uncompress a `.txt.gz` file in mac?

I already tried `unzip file.txt.gz` but it says it cannot find zipfile directory in one of file.txt.gz or file.txt.gz.zip, and cannot find file.txt.gz.ZIP, period.

uncompress a .txt.gz file in mac?

As titled, what&#39;s the purpose of &quot;--no-use-binaries&quot; in carthage command line? if missing this, what could happen and what&#39;s the benefit to have this?

what&#39;s the purpose of &quot;--no-use-binaries&quot; in carthage

I can&#39;t get rid of this error!

[![][1]][1]


I have tried all sorts of things like clearing Derived Data(Preferences-&gt;Locations-&gt;click gray arrow to open Derived Data folder in Finder-&gt;right-click, move to trash), cleaning the project(CMD+Shift+K or Product-&gt;Clean), updating carthage and dependencies, checked other answers on StackOverflow (mostly adjustments in Build Settings/Phases), and recloned the app from github, etc.

The same project works on my collaborators computers..

EDIT:
From the current top-rated answer, I was able to debug a little further...I am still not sure how to fix though. It looks like I have something in the project twice? I looked and can&#39;t find anything showing up twice!

Here&#39;s a picture of the log:
[![][2]][2]


  [1]: https://i.stack.imgur.com/JwtrU.png
  [2]: https://i.stack.imgur.com/gngDH.png

Linker Command failed with exit code 1 (use -v to see invocation), Xcode 8, Swift 3

I use *Carthage* dependencies manager in my iOS projects and I am wondering what is the best way to clean its cache in case some issues with update occur

How to clear Carthage cache?

I want to install carthage on my Mac OS using `brew install carthage` command. However, I get the following error:

    touch: /usr/local/Homebrew/.git/FETCH_HEAD: Permission denied
    touch: /usr/local/Homebrew/Library/Taps/caskroom/homebrew-cask/.git/FETCH_HEAD: Permission denied
    touch: /usr/local/Homebrew/Library/Taps/dart-lang/homebrew-dart/.git/FETCH_HEAD: Permission denied
    touch: /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/.git/FETCH_HEAD: Permission denied
    fatal: Unable to create &#39;/usr/local/Homebrew/.git/index.lock&#39;: Permission denied
    error: could not lock config file .git/config: Permission denied
    Warning: carthage 0.26.2 is already installed, it&#39;s just not linked.
    You can use `brew link carthage` to link this version.

I also get the following error when I used `sudo brew install carthage`:

    Error: Running Homebrew as root is extremely dangerous and no longer supported.
    As Homebrew does not drop privileges on installation you would be giving all
    build scripts full access to your system.

Can you let me know what is the problem. Thanks in advance. 

Content Type	Original Author	Original Content on Stackoverflow
Question	Sivaram Yadav	View Question on Stackoverflow
Solution 1 - Command Line	Adriana Pineda	View Answer on Stackoverflow
Solution 2 - Command Line	vol	View Answer on Stackoverflow
Solution 3 - Command Line	Vinita	View Answer on Stackoverflow

Command Line Tool - Error - xcrun: error: unable to find utility "xcodebuild", not a developer tool or in PATH

Command Line Problem Overview

Command Line Solutions

Solution 1 - Command Line

Solution 2 - Command Line

The simplest fix is from CLI:

Solution 3 - Command Line

How do I dispatch_sync, dispatch_async, dispatch_after, etc in Swift 3, Swift 4, and beyond?

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