Lee Foster lpf23

## OS X - Show Hidden Files
Show all files:
$ defaults write com.apple.finder AppleShowAllFiles -boolean true
$ killall Finder

Hide the hidden files again:
$ defaults delete com.apple.finder AppleShowAllFiles
$ killall Finder

## Install VirtualBox Guest Additions with Debian VM
http://virtualboxes.org/doc/installing-guest-additions-on-debian/

Follow these steps to install the Guest Additions on your Debian virtual machine:

1) Login as root;
2) Update your APT database with apt-get update;
3) Install the latest security updates with apt-get upgrade;
4) Install required packages with apt-get install build-essential module-assistant;
5) Configure your system for building kernel modules by running m-a prepare;
6) Click on Install Guest Additions… from the Devices menu, then run mount /media/cdrom.

## CentOS & sudo
http://wiki.centos.org/TipsAndTricks/BecomingRoot

-- su --

su - <user>  --> gives identity of <user> along with <user>'s environment
su <user>    --> gives identity of <user> only

su - root    --> gives identify ot root along with environment
su root      --> gives identity of root only
su -         --> gives identity of root along with environment

## CentOS Static IP
# vi /etc/sysconfig/netwokr-scripts/ifcfg-eth0

DEVICE=eth0
...
BOOTPROTO=static
IPADDR=192.168.1.123
NETMASK=255.255.255.0
...

## Install postgresql on CentOS - configure to connect with pgAdmin
1) # yum install postgresql postgresql-server
2) # chkconfig postgresql on
3) # service postgresql start
4) # sudo -s
5) # su - postgres
6) $ psql -d template1 -U postgres
7) ALTER USER postgres WITH PASSWORD '<newpassword>';
8) \q
9) # cd /var/lib/psql/data
10) # vi pg_hba.conf

## Update VBoxGuestAddtions on CentOS Guest
I ran into an issue updating VirtualBox Guest Additions on CentOS 6.5 guest.

This error specifically:
"Virtualbox Guest Additions installation, Windows System and desktop setup install_x11_startup_app: no script"

To resolve this error:

1) Remove any old VBoxGuestAdditions-x.x.xx directories in /opt/
   ex: # rm -rf /opt/VBoxGuestAdditions-4.3.08
2) Remove symlinks /usr/lib64/VBoxGuestAdditions and /usr/share/VBoxGuestAdditions

## jekyll theme npm commands
$ cd /workspace/TECBlog <---- location of package.json file
$ npm install           <---- install packages referenced in package.json (only need to run once)
$ grunt                 <---- run commands (theme changes, optimizations, etc.) in Gruntfile.js

## SHA1 JavaScript Demo
<html>
  <script type="text/javascript">
  /**
  *  Secure Hash Algorithm (SHA1)
  *  http://www.webtoolkit.info/
  **/
  function SHA1(msg) {
    function rotate_left(n,s) {
      var t4 = ( n<<s ) | (n>>>(32-s));
      return t4;

## Heroku DB Backup Commands
heroku pgbackups:capture DATABASE --app app1 --expire

## Install VirtualBox Guest Additions on Centos 6.5
1.  In order to fully update your guest system, open a terminal and run

    yum update

as root.

2. Install the GNU C compiler and the kernel development packages using

    yum install gcc
	Show all files:
	$ defaults write com.apple.finder AppleShowAllFiles -boolean true
	$ killall Finder

	Hide the hidden files again:
	$ defaults delete com.apple.finder AppleShowAllFiles
	$ killall Finder
	http://virtualboxes.org/doc/installing-guest-additions-on-debian/

	Follow these steps to install the Guest Additions on your Debian virtual machine:

	1) Login as root;
	2) Update your APT database with apt-get update;
	3) Install the latest security updates with apt-get upgrade;
	4) Install required packages with apt-get install build-essential module-assistant;
	5) Configure your system for building kernel modules by running m-a prepare;
	6) Click on Install Guest Additions… from the Devices menu, then run mount /media/cdrom.
	http://wiki.centos.org/TipsAndTricks/BecomingRoot

	-- su --

	su - <user> --> gives identity of <user> along with <user>'s environment
	su <user> --> gives identity of <user> only

	su - root --> gives identify ot root along with environment
	su root --> gives identity of root only
	su - --> gives identity of root along with environment
	# vi /etc/sysconfig/netwokr-scripts/ifcfg-eth0

	DEVICE=eth0
	...
	BOOTPROTO=static
	IPADDR=192.168.1.123
	NETMASK=255.255.255.0
	...
	1) # yum install postgresql postgresql-server
	2) # chkconfig postgresql on
	3) # service postgresql start
	4) # sudo -s
	5) # su - postgres
	6) $ psql -d template1 -U postgres
	7) ALTER USER postgres WITH PASSWORD '<newpassword>';
	8) \q
	9) # cd /var/lib/psql/data
	10) # vi pg_hba.conf
	I ran into an issue updating VirtualBox Guest Additions on CentOS 6.5 guest.

	This error specifically:
	"Virtualbox Guest Additions installation, Windows System and desktop setup install_x11_startup_app: no script"

	To resolve this error:

	1) Remove any old VBoxGuestAdditions-x.x.xx directories in /opt/
	ex: # rm -rf /opt/VBoxGuestAdditions-4.3.08
	2) Remove symlinks /usr/lib64/VBoxGuestAdditions and /usr/share/VBoxGuestAdditions
	$ cd /workspace/TECBlog <---- location of package.json file
	$ npm install <---- install packages referenced in package.json (only need to run once)
	$ grunt <---- run commands (theme changes, optimizations, etc.) in Gruntfile.js
	<html>
	<script type="text/javascript">
	/**
	* Secure Hash Algorithm (SHA1)
	* http://www.webtoolkit.info/
	**/
	function SHA1(msg) {
	function rotate_left(n,s) {
	var t4 = ( n<<s ) \| (n>>>(32-s));
	return t4;
	1. In order to fully update your guest system, open a terminal and run

	yum update

	as root.

	2. Install the GNU C compiler and the kernel development packages using

	yum install gcc