R help - Oct 2012 - Setup Alias & Working Directory

I have 2 questions:

1-   I want to setup alias for dbconnect in User .Rprofile.

mydb = dbConnect(MySQL(), user='ghulam', password='password',
dbname='ghulam_test', host='localhost')


2- I want to setup two working directory one is for user personal dirctory.

I have setup .Rprofile in users Home directory with this command

setwd("/home/ghulam/R")

I also want to setup Shared Working Directory for all Users .

Can you please help me to figure it out.

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