Why I can't change directories using “cd”?

Question

I\'m trying to write a small script to change the current directory to my project directory:

#!/bin/bash
cd /home/tree/projects/java

I save

Answer 1

I did the following:

create a file called case

paste the following in the file:

#!/bin/sh

cd /home/"$1"

save it and then:

chmod +x case

I also created an alias in my .bashrc:

alias disk='cd /home/; . case'

now when I type:

case 12345

essentially I am typing:

cd /home/12345

You can type any folder after 'case':

case 12

case 15

case 17

which is like typing:

cd /home/12

cd /home/15

cd /home/17

respectively

In my case the path is much longer - these guys summed it up with the ~ info earlier.