- `cd /usr/local`
- `git status`
- Discard all the changes (unless you actually want to try to commit to Homebrew - you probably don&#39;t)
- `git status` til it&#39;s clean
- `brew update`

As of 2021 you can simply use `brew update` which updates homebrew itself. 

Alternatively you could update `brew` by installing it again. (Think I did this as El Capitan changed something)

**Note**: this is a heavy handed approach that will remove all applications installed via brew!

Try to install brew a fresh and it will tell how to uninstall. 

At original time of writing to uninstall:

    ruby -e &quot;$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)&quot;

**Edit:** As of 2020 to uninstall:

    /bin/bash -c &quot;$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall.sh)&quot;


This is not a full/correct MySQL query only pseudo-code:
   

    Select *
     from Notifications as n
     where n.date &gt; (CurrentDate-10 days)
     limit by 1
     FOR UPDATE

http://dev.mysql.com/doc/refman/5.0/en/select.html states:
If you use FOR UPDATE with a storage engine that uses page or row locks, rows examined by the query are write-locked until the end of the current transaction

Is here only the one record returned locked by MySQL or all records it has to scan to find the single record?


When using MySQL&#39;s FOR UPDATE locking, what is exactly locked?

I know how to initliaize one but how do add I items to an Array? I heard it was `push()` maybe? I can&#39;t find it...

Add to Array jQuery

When I ran:

    brew update

I got a message saying it initialized an empty repository in `/usr/local/.git/`, then I got this error:

![Screenshot][1]

  [1]: http://i.stack.imgur.com/UVOco.png

How do I update Homebrew?

When I ran:
<pre><code class="hljs language-sql">brew update
</code></pre>
I got a message saying it initialized an empty repository in <code>/usr/local/.git/</code>, then I got this error:
<img src="http://i.stack.imgur.com/UVOco.png" alt="Screenshot">

I have the following .gitignore file

    # file named .gitignore
    
    system/application/config/database.php
    system/application/config/config.php
    system/logs
    modules/recaptcha/config/*

However when I add any changes in config and recapcha.php, git status warns me as following.
When I add any changes to database.php. it does not show it in status

    shin@shin-Latitude-E5420:/var/www/myapp$ git status
    # On branch master
    # Your branch is ahead of &#39;origin/master&#39; by 1 commit.
    #
    # Changes not staged for commit:
    #   (use &quot;git add &lt;file&gt;...&quot; to update what will be committed)
    #   (use &quot;git checkout -- &lt;file&gt;...&quot; to discard changes in working directory)
    #
    #	modified:   modules/recaptcha/config/recaptcha.php
    #	modified:   system/application/config/config.php
    #
    no changes added to commit (use &quot;git add&quot; and/or &quot;git commit -a&quot;)


How can I fix this?

Thanks in advance.

I am using git version 1.7.5.1 on Ubuntu 11.04

git .ignore not working in a directory

Is it possible to use a .netrc file on Windows when I&#39;m using Git to clone a remote repository with HTTP and user - password?


Git - How to use .netrc file on Windows to save user and password

I have some trouble with a git repository that contains several submodules.

The super git repository was constructed with the commands

    mkdir projectname
    cd projectname
    git init
    git submodule add ssh://myusername@server/pathtorepos

When a different user (&quot;otheruser&quot;) then clones the super repository everything seems to work out. But when it is time to get access to the submodule 

    git submodule init
    git submodule update

git tries to clone the submodule using &quot;myusername&quot; instead of &quot;otheruser&quot;.

How to solve this problem?

Git submodules and ssh access

Is there a config way to set this up without having to specify which branch?

How can you git pull only the current branch?

I can find the current git branch name by doing either of these:

    git branch | awk &#39;/^\*/ { print $2 }&#39;
    git describe --contains --all HEAD

But when in a detached HEAD state, such as in the post build phase in a [Jenkins][1] maven build (or in a Travis git fetch), these commands doesn&#39;t work.

My current working solution is this:

    git show-ref | grep $(git log --pretty=%h -1) | sed &#39;s|.*/$.*$|\1|&#39; | sort -u | grep -v HEAD

It displays any branch name that has the last commit on its HEAD tip.  This works fine, but I feel that someone with stronger git-fu might have a prettier solution?

  [1]: http://jenkins-ci.org/

How to find the current git branch in detached HEAD state

I have memcached installed via homebrew.

 1. how do I start/stop the server? 

 2. Any command-line tools to interact with memcached?

 3. does homebrew have a way of removing a package?  

Installed memcached via homebrew, how to start and stop server?

I&#39;m trying to install Imagemagick on OSX Lion but something is not working as expected.

    -&gt; brew install imagemagick

    /usr/local/git/bin/git
    ==&gt; Cloning https://github.com/adamv/ImageMagick.git
    Cloning into /Users/klebershimabuku/Library/Caches/Homebrew/imagemagick--git...
    fatal: https://github.com/adamv/ImageMagick.git/info/refs not found: did you run git      update-server-info on the server?
    Error: Failure while executing: git clone --depth 1 https://github.com/adamv/ImageMagick.git /Users/kleber/Library/Caches/Homebrew/imagemagick--git

brew doctor says:


    -&gt; brew doctor
    We couldn&#39;t detect gcc 4.0.x. Some formulae require this compiler.

    Some &quot;config&quot; scripts were found in your path, but not in system or Homebrew folders.

    `./configure` scripts often look for *-config scripts to determine if software packagesare installed, and what additional flags to use when compiling and linking.

    Having additional scripts in your path can confuse software installed via Homebrew if the config script overrides a system or Homebrew provided script of the same name.

    /Users/kleber/.rvm/gems/ruby-1.9.2-p180@global/bin
    passenger-config

    Setting DYLD_LIBARY_PATH can break dynamic linking.
    You should probably unset it.


And yes, I have XCode 4.1 installed and running.



    -&gt; brew update
    From http://github.com/mxcl/homebrew
    * branch            master     -&gt; FETCH_HEAD
    Already up-to-date.


How do I install imagemagick with homebrew?

I have a **Homebrew** formula that I wish to uninstall/remove along with all its dependencies, skipping packages whom other packages depend upon (a.k.a. [Cascading package removal][1] in Package manager parlance).

*e.g.* Uninstall package `a` which depends on packages `b` &amp; `c`, where package `d` also depends on package `c`. The result should uninstall both `a` &amp; `b`, skipping `c`.

How can I do that?

There must be a way to uninstall a package without leaving unnecessary *junk* behind.


  [1]: https://en.wikipedia.org/wiki/Package_manager#Cascading_package_removal

Uninstall / remove a Homebrew package including all its dependencies

**[edit]** I was troubleshooting problems with my development environment when I noticed one of my problems was the dependency on ImageMagick, since it&#39;s a vital part of my app.

---

After upgrading to OS X Lion (10.7) i no longer had ImageMagick available, i then tried installing again using MacPorts without success, i then installed from source, and the install wasn&#39;t very successfully i had convert and identify but it output error messages that i unfortunately dont have anymore, i by some strange reason decided to remove all of my MacPort libraries and started using Homebrew, i tried installing ImageMagick, it installs OK but when i try to use it throws this error

    dyld: Library not loaded: /opt/local/lib/libltdl.7.dylib
      Referenced from: /usr/local/bin/convert
      Reason: Incompatible library version: convert requires version 11.0.0 or later, but libltdl.7.dylib provides version 10.0.0
    Trace/BPT trap: 5

I read online but i have no clue on whats going on here, i found that libltdl is called libtool, and that i obviously need to upgrade it to a newer version, but i havent found any indication of how or where to find the source, or if this should be already be handled by homebrew and why it hasn&#39;t.

I tried installing ImageMagick again from source using [this installer script https://github.com/masterkain/ImageMagick-sl](https://github.com/masterkain/ImageMagick-sl) but when i try to use convert it throws a similar error.

    $ convert gnome.jpg -resize 50% gnome_.jpg
    dyld: Library not loaded: /opt/local/lib/libltdl.7.dylib
      Referenced from: /usr/local/bin/convert
      Reason: Incompatible library version: convert requires version 11.0.0 or later, but libltdl.7.dylib provides version 10.0.0
    Trace/BPT trap: 5

    $ which convert
    /usr/local/bin/convert

What can i do to solve my problem?

ImageMagick and OS X Lion trouble

I&#39;m having an issue with my install of postgres in my development environment and I need some help diagnosing it. I haven&#39;t yet had any luck in tracking down a solution.

 1. I have postgres 9.0.4 installed with homebrew 
 2. I am running on OS X 10.6.8 (Snow Leopard)

I can start and stop the server

    $ pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
    server starting

If I try to stop though

    $ pg_ctl -D /usr/local/var/postgres stop -s -m fast
    pg_ctl: PID file &quot;/usr/local/var/postgres/postmaster.pid&quot; does not exist
    Is server running?

Ok this is missing

    $ ls -l /usr/local/var/postgres/ | grep postmaster
    $


But it is definitely running

    $ ps aux | grep postgres
    pschmitz   303   0.9  0.0  2445860   1428   ??  Ss    3:12PM   0:02.46 postgres: autovacuum launcher process       
    pschmitz   304   0.9  0.0  2441760    428   ??  Ss    3:12PM   0:02.57 postgres: stats collector process       
    pschmitz   302   0.0  0.0  2445728    508   ??  Ss    3:12PM   0:00.56 postgres: wal writer process       
    pschmitz   301   0.0  0.0  2445728    560   ??  Ss    3:12PM   0:00.78 postgres: writer process       
    pschmitz   227   0.0  0.1  2445728   2432   ??  S     3:11PM   0:00.42 /usr/local/Cellar/postgresql/9.0.3/bin/postgres -D /usr/local/var/postgres -r /usr/local/var/postgres/server.log

And if I try to access or use it I get this.

    $psql
    psql: FATAL:  could not open relation mapping file &quot;global/pg_filenode.map&quot;: No such file or directory

But global/pg_filenode.map definitely exists in 

    $ls -l /usr/local/var/postgres/
    
    ...
    -rw-------  1 pschmitz  staff   8192 Sep 16 15:48 pg_control
    -rw-------  1 pschmitz  staff    512 Sep 16 15:48 pg_filenode.map
    -rw-------  1 pschmitz  staff  12092 Sep 16 15:48 pg_internal.init

I have attempted to uninstall and reinstall to no effect. Any ideas on how I can solve this? 
It has pretty much prevented me from getting anything done today.

Content Type	Original Author	Original Content on Stackoverflow
Question	andrewpthorp	View Question on Stackoverflow
Solution 1 - Git	corysimmons	View Answer on Stackoverflow
Solution 2 - Git	nzoLogic	View Answer on Stackoverflow
Solution 3 - Git	Peter O'Brien	View Answer on Stackoverflow

How do I update Homebrew?

Git Problem Overview

Git Solutions

Solution 1 - Git

Solution 2 - Git

Solution 3 - Git

Add to Array jQuery

When using MySQL's FOR UPDATE locking, what is exactly locked?

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