Remove it just like you would any other file: `rm /usr/lib/libmysqlclient.18.dylib`. rm will remove the symlink itself, not the file the link is pointing at.

You could also use the unlink command: `unlink /path/to/sym/link`

I believe just deleting the file within Finder works fine also, it will have a little shortcut icon on it.

Just run:

    rm /usr/lib/libmysqlclient.18.dylib

This will remove the file (i.e. the symlink).

Alternatively you may use unlink:

    unlink /usr/lib/libmysqlclient.18.dylib

I had a link pointing to a folder with short-name &quot;testproject&quot;:
you make that with this command 

    ln -s /Users/SHERIF/repo/test  testproject

I had to change the folder name to something else for some reasons when I run the command unlink pointing to the old folder directory it didn&#39;t work. 

I tried to only `unlink testproject` to remove the short-name so I can re-use the same name again and link to the newly named folder. it did work fine for me.






Somehow I had a symlink to a non-existing folder. Have no idea how it happened but to remove it I found the easiest way was open in finder and manually delete it. I came to this decision after an hour wasted on trying to delete it with the Terminal.

You could remove that link with `sudo rm /usr/lib/libmysqlclient.18.dylib`

I&#39;m working on building an Android app and I&#39;m wondering what the best approach is to debugging like that of console.log in javascript

What&#39;s the console.log() of java?

How can I use `sips`, `imagemagic`, or another tool to convert an image to black and white (grayscale) via the command line? 

How can I convert an image to grayscale via the command line?

i just created the symlink `sudo ln -s /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/lib/libmysqlclient.18.dylib` and am wondering how i get rid of it if I wanted to. How would i do this?

How do I remove a symlink?

<p>i just created the symlink <code>sudo ln -s /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/lib/libmysqlclient.18.dylib</code> and am wondering how i get rid of it if I wanted to. How would i do this?</p>


When I call `respondsToSelector` in an ARC environment, I get the following error message `Automatic Reference Counting Issue` `No known instance method for selector respondsToSelector:`

This is the header

    #import &lt;AppKit/AppKit.h&gt;
    
    
    @class MTScrollView;
    
    @protocol MTScrollViewDelegate
    -(void)scrollViewDidScroll:(MTScrollView *)scrollView;
    @end
    
    
    @interface MTScrollView : NSScrollView 
    {
        
    }
    
    @property(nonatomic, weak) id&lt;MTScrollViewDelegate&gt;delegate;
    
    @end


This is the implementation file


    #import &quot;MTScrollView.h&quot;
    
    @implementation MTScrollView
    
    @synthesize delegate;
    
    
    - (void)reflectScrolledClipView:(NSClipView *)aClipView
    {
    	[super reflectScrolledClipView:aClipView];
        
    	if([delegate respondsToSelector:@selector(scrollViewDidScroll:)])
        {
    		[delegate scrollViewDidScroll:self];
    	}
    }
    
    @end

Any suggestions on why I am getting this error?


Cannot use respondsToSelector using ARC on Mac

I am using my new mac for the first time today. I am following the get started guide on the mongodb.org up until the step where one creates the /data/db directory. btw, I used the homebrew route. 

So I open a terminal, and I think I am at what you called the Home Directory, for when I do &quot;ls&quot;, I see folders of Desktop Application Movies Music Pictures Documents and Library.

So I did a 
    
    mkdir -p /data/db

first, it says permission denied. I kept trying different things for half and hour and finally :

    mkdir -p data/db

worked. and when I &quot;ls&quot;, a directory of data and nested in it a db folder do exist.

then I fire up mongod and it complains about not finding data/db

Have I done something wrong?



Now I have done the 

    sudo mkdir -p /data/db

and when I do a &quot;ls&quot; I do see the data dir and the db dir. inside the db dir though, there is absolutely nothing in it and when I now run mongod

    Sun Oct 30 19:35:19 [initandlisten] exception in initAndListen: 10309 Unable to create/open lock file: /data/db/mongod.lock errno:13 Permission denied Is a mongod instance already running?, terminating
    Sun Oct 30 19:35:19 dbexit: 
    Sun Oct 30 19:35:19 [initandlisten] shutdown: going to close listening sockets...
    Sun Oct 30 19:35:19 [initandlisten] shutdown: going to flush diaglog...
    Sun Oct 30 19:35:19 [initandlisten] shutdown: going to close sockets...
    Sun Oct 30 19:35:19 [initandlisten] shutdown: waiting for fs preallocator...
    Sun Oct 30 19:35:19 [initandlisten] shutdown: lock for final commit...
    Sun Oct 30 19:35:19 [initandlisten] shutdown: final commit...
    Sun Oct 30 19:35:19 [initandlisten] shutdown: closing all files...
    Sun Oct 30 19:35:19 [initandlisten] closeAllFiles() finished
    Sun Oct 30 19:35:19 [initandlisten] shutdown: removing fs lock...
    Sun Oct 30 19:35:19 [initandlisten] couldn&#39;t remove fs lock errno:9 Bad file descriptor
    Sun Oct 30 19:35:19 dbexit: really exiting now

EDIT 
Getting error message for
    
    sudo chown mongod:mongod /data/db

    chown: mongod: Invalid argument

Thanks, everyone!

Mongod complains that there is no /data/db folder

How can I tell if my Postgresql server is running or not?

I&#39;m getting this message:

    [~/dev/working/sw] sudo bundle exec rake db:migrate 
    rake aborted!
    could not connect to server: Connection refused
    	Is the server running on host &quot;localhost&quot; and accepting
    	TCP/IP connections on port 5432?


Update:

    &gt; which postgres
    /usr/local/bin/postgres
    &gt; pg_ctl -D /usr/local/bin/postgres -l /usr/local/bin/postgres/server.log start
    pg_ctl: could not open PID file &quot;/usr/local/bin/postgres/postmaster.pid&quot;: Not a directory

Update 2:

    &gt;pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
    server starting
    sh: /usr/local/var/postgres/server.log: No such file or directory

How to check status of PostgreSQL server Mac OS X

### Final update:

I had forgotten to run the `initdb` command.

&lt;hr/&gt;

By running this command

    ps auxwww | grep postgres

I see that `postgres` is not running

    &gt; ps auxwww | grep postgres
    remcat          1789   0.0  0.0  2434892    480 s000  R+   11:28PM   0:00.00 grep postgres

This raises the question:

How do I start the PostgreSQL server?

Update:

    &gt; pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
    server starting
    sh: /usr/local/var/postgres/server.log: No such file or directory

Update 2:

The *touch* was not successful, so I did this instead:

    &gt; mkdir /usr/local/var/postgres
    &gt; vi /usr/local/var/postgres/server.log
    &gt; ls /usr/local/var/postgres/
    server.log

But when I try to start the Ruby on Rails server, I still see this:

&gt; Is the server running on host &quot;localhost&quot; and accepting
&gt; TCP/IP connections on port 5432?

Update 3:

    &gt; pg_ctl -D /usr/local/var/postgres status
    pg_ctl: no server running

Update 4:

I found that there ***wasn&#39;t any*** *pg_hba.conf* file (only file *pg_hba.conf.sample*), so I modified the sample and renamed it (to remover the .sample). Here are the contents:

     # IPv4 local connections:
     host    all             all             127.0.0.1/32           trust
     # IPv6 local connections:
     host    all             all             ::1/128                trust

But I don&#39;t understand this:

    &gt; pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
    server starting
    &gt; pg_ctl -D /usr/local/var/postgres status
    pg_ctl: no server running

Also:

    sudo find / -name postgresql.conf
    find: /dev/fd/3: Not a directory
    find: /dev/fd/4: Not a directory

Update 5:

    sudo pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
    Password:
    pg_ctl: cannot be run as root
    Please log in (using, e.g., &quot;su&quot;) as the (unprivileged) user that will own the server process.

Update 6:

This seems odd:

    &gt; egrep &#39;listen|port&#39; /usr/local/var/postgres/postgresql.conf
    egrep: /usr/local/var/postgres/postgresql.conf: No such file or directory

Though, I did do this:

    &gt;sudo find / -name &quot;*postgresql.conf*&quot;
    find: /dev/fd/3: Not a directory
    find: /dev/fd/4: Not a directory
    /usr/local/Cellar/postgresql/9.0.4/share/postgresql/postgresql.conf.sample
    /usr/share/postgresql/postgresql.conf.sample

So I did this:

    egrep &#39;listen|port&#39; /usr/local/Cellar/postgresql/9.0.4/share/postgresql/postgresql.conf.sample
    #listen_addresses = &#39;localhost&#39;        # what IP address(es) to listen on;
    #port = 5432                # (change requires restart)
                    # supported by the operating system:
                    #   %r = remote host and port

So I tried this:

    &gt; cp /usr/local/Cellar/postgresql/9.0.4/share/postgresql/postgresql.conf.sample /usr/local/Cellar/postgresql/9.0.4/share/postgresql/postgresql.conf
    &gt; cp /usr/share/postgresql/postgresql.conf.sample /usr/share/postgresql/postgresql.conf

I am still getting the same &quot;Is the server running?&quot; message.


How can I start PostgreSQL server on Mac OS X?

I am using NSUserDefaults to store some data in my application.

    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
    [prefs setObject:@&quot;dummy string&quot; forKey:@&quot;lastValue&quot;];
    [prefs synchronize];

For testing purposes I need to see the System Preferences plist file where my NSUserDefaults data is saving on the Mac.

I know where the iOS application user defaults are stored, but I don&#39;t know about mac application. Where is a Mac Application&#39;s NSUserDefaults Data Stored?

Where is a Mac Application&#39;s NSUserDefaults Data Stored?

I run `find` and iterate through the results with `[ $ -L $F $  ]` to collect certain symbolic links. 

I am wondering if there is an easy way to determine if the link is broken (points to a non-existent file) in this scenario.

Here is my code:

    FILES=`find /target/ | grep -v &#39;\.disabled$&#39; | sort`

    for F in $FILES; do
        if [ -L $F ]; then
            DO THINGS
        fi
    done

How can I detect whether a symlink is broken in Bash?

How do I change a symlink to point from one file to another in Python?

The [`os.symlink`](https://docs.python.org/3/library/os.html#os.symlink) function only seems to work to create new symlinks.

Modifying a symlink in python

What is the most direct way to convert a symlink into a regular file (i.e. a copy of the symlink target)?

Suppose `filename` is a symlink to `target`.  The obvious procedure to turn it into a copy is:

    cp filename filename-backup
    rm filename
    mv filename-backup filename

Is there a more direct way (i.e. a single command)?





How to convert symlink to regular file?

I&#39;m trying to find all of the symlinks within a directory tree for my website. I know that I can use `find` to do this but I can&#39;t figure out how to recursively check the directories.

I&#39;ve tried this command:

    find /var/www/ -type l

&amp;hellip; and later I discovered that the contents in `/var/www` are symlinks, so I&#39;ve changed the command to: 

    find -L /var/www/ -type l

it take a while to run, however I&#39;m getting no matches.

**How do I get this to check subdirectories?**


How do I find all of the symlinks in a directory tree?

This question has appeared in similar forms [here](https://stackoverflow.com/questions/5917249/git-symlinks-in-windows) and [here](https://stackoverflow.com/questions/5190170/ignoring-symlinks-in-git), but they don&#39;t seem to match up with what I&#39;m looking for.

I&#39;m making a project in StaticMatic, a Ruby static site generator. Basically, it&#39;s just a src/  directory with Haml templates, Sass, and CoffeeScript. StaticMatic provides a development server to keep compiling these into a static site, as well as a build command that generates the static site in build/.

My modification to StaticMatic is to allow the addition of src/_modules/foo/, which might contain src/_modules/foo/bar.haml. When running the server or building the site, a symlink would be created at src/bar.haml which points to the file in foo/.

So far so good. (Conflicts are handled, etc.)

The reasoning behind separate directories in _modules/ is that they could be tracked as git submodules and checked out independently by other teams. Essentially, this allows multiple teams to work on different pages (actually JS apps) in one static site without duplicating the main layout and such.

The hitch is that git wants to think of these symlinks as files. For instance, `git status` shows:

    # On branch master
    # Untracked files:
    #   (use &quot;git add &lt;file&gt;...&quot; to include in what will be commited)
    #
    #       src/_modules/bar/foo.haml
    #       src/foo.haml

...when I really just want it to show `src/_modules/bar/foo.haml` and to ignore `src/foo.haml`

One approach would be to have my link-generating code append the links to .gitignore, but messing with .gitignore programmatically strikes me as prone to error. (Perhaps this concern isn&#39;t reasonable?)

My ideal fix would be something like:

    [filetype = link]

...in .gitignore. As far as I know nothing like this is possible, or is it?



Content Type	Original Author	Original Content on Stackoverflow
Question	locoboy	View Question on Stackoverflow
Solution 1 - Macos	Marc B	View Answer on Stackoverflow
Solution 2 - Macos	AlecRust	View Answer on Stackoverflow
Solution 3 - Macos	Mohammad Anini	View Answer on Stackoverflow
Solution 4 - Macos	Sherif SALEH	View Answer on Stackoverflow
Solution 5 - Macos	Pip	View Answer on Stackoverflow
Solution 6 - Macos	Basile Starynkevitch	View Answer on Stackoverflow

How do I remove a symlink?

Macos Problem Overview

Macos Solutions

Solution 1 - Macos

Solution 2 - Macos

Solution 3 - Macos

Solution 4 - Macos

Solution 5 - Macos

Solution 6 - Macos

How can I convert an image to grayscale via the command line?

What's the console.log() of java?

Attributions