FIX AUTOFS TIMEOUT

This doesn't exactly fix the problem, but does make it so infrequent as to effectively disable it. The autofs behavior is explained incredibly well by Mike Mackovitch here

sudo nano /etc/autofs.conf

change
AUTOMOUNT_TIMEOUT=3600

to
AUTOMOUNT_TIMEOUT=315360000 (10 years)

WINDOWS SHUTDOWN REMOTE COMPUTERS

shutdown /r /t <seconds> /f /m <computer name>

/r: restart
/t: seconds to display shutdown message
/f: force close

GET EXTERNAL IP FROM COMMAND LINE

curl -s checkip.dyndns.org|sed -e 's/.*Current IP Address: //' -e 's/<.*$//'

COMMAND LINE CONTROL WINDOWS SERVICES

List running services:
net start

Start service:
net start <service_name>

Stop service:
net stop <service_name>

OS X PERMANENT STATIC ROUTE

cd /Library/StartupItems

sudo mkdir StaticRoutes
cd StaticRoutes

Create file StaticRoutes
sudo nano StaticRoutes

#!/bin/sh
# Set up static routing tables
# Roark Holz, Thursday, April 6, 2006

. /etc/rc.common
StartService ()
{
ConsoleMessage "Adding Static Routing Tables"
route add -net 192.168.20.0/24 192.168.0.2
}

StopService ()
{
return 0
}

RestartService ()
{
return 0
}

RunService "$1"

Create file StartupParameters.plist
sudo nano StartupParameters.plist

{
Description = "Add static routing tables";
Provides = ("StaticRoutes");
Requires = ("Network");
OrderPreference = "None";
}

Set as an executable file:
sudo chmod 755 StaticRoutes StartupParameters.plist

To view routes:
netstat -r

USERS AND GROUPS IN LINUX

Display users details: sudo id <user>

Add group: sudo groupadd <group>

Create user and add to group: sudo useradd -g <group> <user>

Add user to a group: sudo usermod -a -G <group> <user>

Change a users primary group: sudo usermod -g <group> <user>

CHANGE LEOPARD LOGIN WALLPAPER

sudo cp /<path-to-image-file>/<image-file.jpg> /System/Library/CoreServices/DefaultDesktop.jpg