No audio on headphone / earphone right channel when plugged into Macbook

1. Plug earphone / headphone in Macbook / Macbook Pro headphone jack.

2. Open Settings

3. Select the Sounds option

4. Slide Balance to Center.

Step by Step Raspbian Installation on Raspberry Pi 2 using OS X Yosemite

Step by Step Raspbian (2015-05-05 Debian Wheezy) Installation on Raspberry Pi 2 Model B using OS X Yosemite


Download Raspbian
Download Raspbian image from Raspberry.org Downloads page

Verify downloaded Raspbian Image
Verify checksum of downloaded Raspbian image, it should match the SHA-1 from rasberrypi.org website. Open Terminal and execute openssl sha1 [path to image] command.

$ openssl sha1 2015-05-05-raspbian-wheezy.zip

SHA1(2015-05-05-raspbian-wheezy.zip)= cb799af077930ff7cbcfaa251b4c6e25b11483de



Extract image from the Raspbian ZIP file
Open Terminal, extract Raspbian image via unzip command

$ unzip 2015-05-05-raspbian-wheezy.zip
Archive:  2015-05-05-raspbian-wheezy.zip   
  inflating: 2015-05-05-raspbian-wheezy.img



Format microSD Card
1. Insert the MicroSD card into Standard SD Card adapter

2. Insert the SD Card into the SD Card Slot of your OS X Machine. SD Card will be mounted automatically.

3. Open Disk Utility, select the SD Card from the listed drives and click the Erase tab.  Define a name for the partition in the Name field. Erase SD Card using MS-DOS (FAT) Format by clicking the Erase.. button.

Determine the BSD Name

Option 1 via Disk Utility. After erasing/formatting the SD Card, select the newly formatted/erased partition and click First Aid tab. Make sure the Show details is checked and then click Verify Disk button. Take note of the lines of text that appear and look for something like /dev/diskxx. Taken from the example below its ** /dev/rdisk2s1 .

Option 2 via Command line. Open Terminal, issue "df -h" command from the console. Take note of the SD device highlighted below e.g. /dev/disk2s1
 
$ df -h
 
Filesystem      Size   Used  Avail Capacity   iused    ifree %iused  Mounted on
/dev/disk1     465Gi  381Gi   83Gi    83% 100065414 21739407   82%   /
devfs          186Ki  186Ki    0Bi   100%       644        0  100%   /dev
map -hosts       0Bi    0Bi    0Bi   100%         0        0  100%   /net
map auto_home    0Bi    0Bi    0Bi   100%         0        0  100%   /home
/dev/disk2s1    15Gi  2.3Mi   15Gi     1%         0        0  100%   /Volumes/UNTITLED


Using the device name of the partition determine the raw device name for the entire disk, by omitting the final "s1" and replacing "disk" with "rdisk" e.g. the BSD for the /dev/disk2s1 is /dev/rdisk2


Unmount the SD Card partition
Open Terminal, unmount the SD card partition (NOTE: do not Eject) using diskutil unmount command

$ sudo diskutil unmount /dev/disk2s1
Password:*
 
Volume UNTITLED on disk2s1 unmounted


Write Raspbian image to SD Card
Open Terminal, issue the dd command to convert and copy image to raw device. Take note of the correct raw disk device name e.g /dev/disk2s1 => /dev/rdisk2, /dev/disk3s1 => /dev/rdisk3..

$ sudo dd bs=1m if=2015-05-05-raspbian-wheezy.img of=/dev/rdisk2
Password:
 
3125+0 records in
3125+0 records out
3276800000 bytes transferred in 252.814853 secs (12961264 bytes/sec)



Eject SD Card
After the dd command finishes, eject the SD Card

$ sudo diskutil eject /dev/disk2
Password:
 
Disk /dev/disk2 ejected


Install Raspbian
Insert SD card into Raspberry Pi, plug-in device and follow installation instructions.

Updating Crucial MX100 firmware installed on Macbook Unibody 13" (Late 2008) OS X

To find out which firmware revision your SSD is running, follow these steps in OSX:

1. Click on the Apple menu
2. Select "About This Mac", then "More Info..."
3. Select "System Report..."
4. In the Contents list, click on "Hardware" to expand the category
5. Click on Serial-ATA (near the end of the Hardware category)

The drive attributes will be displayed on the pane on the right.  You will see the name of the drive i.e. Crucial CTXXXXXXX, the drive capacity etc.  The firmware version will show in the 'Revision' field.

Components:
1. Download Crucial firmware MU02 MX100_MU02_BOOTABLE_ALL_CAP.zip
2. USB flash drive (or SD card) to be formatted as a FAT32 volume.
3. Download GRUB-EFI bootloader files for 64bit EFI.


# Format USB
Using OS X Disk Utility, format the USB drive as FAT32 (MS-DOS).






# Extract the grubefiusb-0.03.zip

Transfer the following files to the USB:

* EFI/boot/unicode.pf2
* EFI/boot/bootx64.efi
* EFI/boot/grub.cfg

 (e.g EFI folder should be in root folder)

 # Extract the Crucial MX100_MU02_BOOTABLE_ALL_CAP.zip, and open the MX100_MU02_BOOTABLE_ALL_CAP.iso using Disk Mounter

Transfer the following foldes to the USB:

* boot
* cde

 (e.g boot folder should be in root folder)

# Reboot the machine with the customize USB (Press and hold Option key at boot time)

Step by Step Install / Uninstall JDK 8 on OS X Yosemite

Step by Step Setup / Install of Java SE Development Kit 8 on OS X Yosemite

Download the Java SE Development Kit 8
Open Browser and proceed to Oracle's Java SE Downloads page

Click JDK DOWNLOAD button to goto the Java SE Development Kit 8 Downloads page

You must accept the Oracle Binary Code License Agreement for Java SE to enable links for downloading the JDKs.

Select the Accept License Agreement radio button and then will be prompted the message: Thank you for accepting the Oracle Binary Code License Agreement for Java SE; you may now download this software. You are now ready to download the binaries by clicking the corresponding Download link e.g. jdk-8u60-macosx-x64.dmg


Install Java SE Development Kit 8
Open the installer by double-clicking the downloaded Apple Disk Image file e.g jdk-8u60-macosx-x64.dmg

Double-click the pkg icon e.g. JDK 8 Update 60.pkg icon to start installation.















You will be prompted with Welcome to the JDK 8 Update Installer screen. Press the Continue button.
















You will then be prompted with the start of the installation confirmation screen. Press Install button.

You will be prompted to enter administrator credentials in order to continue with the installation. Enter Password and press Install Software button to continue with the installation.

Follow installation instructions and press Close when 

You will be prompted with the installation was completed successfully screen and press Close button to finish installation. 

Once completed, set environment via ~/.bash_profile

$ export set JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home

Verify Installed JDK
Verify installed JDK via java -version command.

$ java -version

java -version
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

Uninstall an existing JDK
List installed Java Virtual Machines via ls command

$ ls /Library/Java/JavaVirtualMachines
jdk1.8.0_51.jdk    jdk1.8.0_60.jdk


To uninstall an existing JDK, issue rm -rf /Library/Java/JavaVirtualMachines/jdkmajor.minor.macro[_update].jdk command for a specific jdk e.g jdk1.8.0_51.jdk

$ sudo rm -rf /Library/Java/JavaVirtualMachines/jdk1.8.0_51.jdk
Password:*
 

Setup / Install Tomcat 8 on OS X Yosemite

#Download latest tomcat

#Create /usr/local 

sudo mkdir -p /usr/local

#Goto directory to /usr/local

cd /usr/local

#Extract downloaded tomcat from the /usr/local

tar -zxvf ./apache-tomcat-8.0.45.tar.gz 

sudo ln -s /usr/local/apache-tomcat-8.0.45 /Library/Tomcat 

#Remove existing tomcat directory

sudo rm -f /Library/Tomcat

#Create symbolic link for easier access
sudo chown -R  /Library/Tomcat
sudo chmod +x /Library/Tomcat/bin/*.sh

#configure gui admin for tomcat via /Library/Tomcat/conf/tomcat-users.xml include inside 

#Start tomcat from terminal

/Library/Tomcat/bin/startup.sh

#Stop tomcat from terminal

/Library/Tomcat/bin/shutdown.sh

Create OS X Yosemite USB drive Installer

1. Download OS X Yosemite from App Store. After download, make sure "Install OS X Yosemite.app" is in the /Applications directory.

2. Insert USB (at least 8GB). No need to clean or format. Installation will format this drive. Take note of the name of the drive via Finder (under devices) or type mount from Terminal and take note of the /Volumes/name_of_usb_drive

3. Open Terminal via Applications->Terminal

4. Type the following from the command line. Replace [name_of_usb_drive] with the name of the drive from #2.

sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/[name_of_usb_drive] --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction
 
5. You will see something like the following, follow instructions and/or let it finish.

"Erasing Disk: 0%... 10%... 20%... 30%...100%... 
Copying installer files to disk... 
Copy complete. 
Making disk bootable... 
Copying boot files... 
Copy complete. 
Done."
 
6. Reboot. Press Option key during boot and choose Install OS X Yosemite drive upon boot.

Install Apache Cassandra on OS X

 # Requirement
Java 7 

# Download Apache Cassandra 2.0.10 from http://cassandra.apache.org/download/
wget http://www.apache.org/dyn/closer.cgi?path=/cassandra/2.0.10/apache-cassandra-2.0.10-bin.tar.gz

# Extract to e.g /usr/local; create symlink
cd /usr/local
tar -xzvf apache-cassandra-2.0.10-bin.tar.gz
ln -s apache-cassandra-2.0.10-bin.tar.gz cassandra

# Create Cassandra directories
sudo mkdir /var/lib/cassandra
sudo mkdir /var/lib/cassandra/data
sudo mkdir /var/lib/cassandra/commitlog
sudo mkdir /var/lib/cassandra/saved_caches
sudo mkdir /var/log/cassandra

# Run Cassandra
cd /usr/local/cassandra
sudo bin/cassandra -f

# Test connection; Open new terminal window
cd /usr/local/cassandra
bin/cqlsh

Setup Apache Tomcat 8 on OS X Mavericks

# Prerequisite - Java installed
# Download Tomcat from tomcat.apache.org e.g. apache-tomcat-8.0.9.tar.gz

# Proceed to target installation directory
cd /usr/local

# Extract
tar -xzvf apache-tomcat-8.0.9.tar.gz

# Symlink shortname
ln -s apache-tomcat-8.0.9.tar.gz tomcat8

# Setup environment
vi setenv.sh

# Include CATALINA_HOME and JRE_HOME

# Add user
vi /usr/local/tomcat8/conf/tomcat-users.xml

# Include all roles (no need to create roles in the tomcat-users.xml )


# Start Tomcat
./startup.sh

# Stop Tomcat
./shutdown.sh

JAVA_HOME Command Tool for OS X

# List installed Java
$/usr/libexec/java_home -verbose

Matching Java Virtual Machines (3):
  1.8.0_05, x86_64:  "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home
  1.6.0_65-b14-466.1, x86_64: "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
  1.6.0_65-b14-466.1, i386: "Java SE 6"   /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home


# Get Current Java  Home
$/usr/libexec/java_home

/Library/Java/JavaVirtualMachines/jdk1.8.0_05.jdk/Contents/Home


# Get path to 1.6 (if installed)
$/usr/libexec/java_home v1.6

/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

Homebrew "brew doctor" Unexpected file Warnings / Errors

Error:

Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry and just ignore them. Thanks!

Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected dylibs:
    /usr/local/lib/libmacfuse_i32.2.dylib
    /usr/local/lib/libmacfuse_i64.2.dylib
    /usr/local/lib/libosxfuse_i32.2.dylib
    /usr/local/lib/libosxfuse_i64.2.dylib

Warning: Unbrewed .la files were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected .la files:
    /usr/local/lib/libosxfuse_i32.la
    /usr/local/lib/libosxfuse_i64.la

Warning: Unbrewed .pc files were found in /usr/local/lib/pkgconfig.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae, and may need to be deleted.

Unexpected .pc files:
    /usr/local/lib/pkgconfig/osxfuse.pc


Solution:
If with TrueCrypt installed, use this script to fix https://gist.github.com/trinitronx/5437061
If OSXFuse installed, remove and use Homebrew's version

Install Homebrew on OS X Mavericks

#Install Homebrew

ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"

#Check for errors before updating
brew doctor

#Check for brew updates 
brew update

Install Apache 2.2 , PHP 5.4 and MySQL 5.5 on OS X using MacPorts

# APACHE

# Install Apache 2.2

sudo port install apache2

# Edit Apache2 Config

vi /opt/local/apache2/conf/httpd.conf

# Find/Edit the following
ServerName localhost:80

# PHP
Install PHP 5.4 
sudo port install php54-apache2handler

# Execute following command to include PHP5 module to Apache2

cd /opt/local/apache2/modules 

sudo /opt/local/apache2/bin/apxs -a -e -n "php5" mod_php54.so 

# MYSQL SERVER

# Install MySQL server
sudo port install mysql55-server

# Setup MySQL DB
sudo -u _mysql /opt/local/lib/mysql55/bin/mysql_install_db  

# Start MySQL
sudo port load mysql55-server

# Setup root password
/opt/local/lib/mysql55/bin/mysqladmin -u root password 'new-password'

# Stop MySQL
sudo port unload mysql55-server
 

Install Git without Install Xcode on OS X

alias git="/usr/local/git/bin/git"

Setup Apache & PHP for Apple OS X 10.9 Mavericks

Check installed version of Apache, open up Terminal and type

httpd -v

Start Apache, open up Terminal and type

sudo apachectl start

Stop Apache, open up Terminal and type

sudo apachectl stop

Enable PHP, open up Terminal and type

sudo vi /etc/apache2/httpd.conf

Uncomment LoadModule statement php5_module

LoadModule php5_module libexec/apache2/libphp5.so

Restart Apache, open up Terminal and Type

sudo apachectl restart

Disable Safari from automatically uncompressing / unzipping downloaded file

Open Safari
Safari -> Preferences... -> General
Uncheck Open "safe" files after downloading

Change iMessage Picture / Icon

Messages -> Change My Picture...

OS X: Partition or Resizing Error / Partition failed with the error: Couldn’t modify partition map because file system verification failed.

Shutdown

Start system into Single User Mode by holding Command+S during boot

At the command prompt, type:
/sbin/fsck -fy then ENTER

When fsck is complete, type “exit” to restart

Start system and verify disk using Disk Utility

Uninstall OS X EnterpriseDB PostgreSQL 9.1

Open a terminal window via Applications->Utilities->Terminal 

open /Library/PostgreSQL/9.1/uninstall-postgresql.app
sudo rm -rf /Library/PostgreSQL 
sudo rm /etc/postgres-reg.ini

Open User & Groups via System Preferences -> Users & Groups and delete PostgreSQL user

OS X Open Terminal at current Folder shortcut

Open System Preferences ->  Keyboard -> Shortcuts
Under Files and Folders, check New Terminal at Folder or New Terminal Tab at Folder

While at a folder, right-click, then Services, then New Terminal

Command-line method to Compute / Generate MD5 Hash for a file

Windows
FCIV -md5 file_name

 Linux
 md5sum file_name

OS X
md5 file_name
openssl md5 file_name