bash scripting for begginers

a simple tutorial for bash scripting users would be very nice and usefull . why do i need this ? i would like to create an installer and i would like to check some things ... something like (will do it in php , sorry ) :

$user = $USERNAME;
if($user != 'root')
{
echo 'you need administrative rights to install this!';
exit;
}
else
{
$get1 = wget http://some_link/;
if(!$get1)
{
echo 'could not download package $get1';
echo 'continue ?'
read answer;
if($answer == y)
{
wget the rest bla bla bla
}
else
{
exit;
}

please , this would be very usefull for me and for others ! thank you

 

http://www.tldp.org/LDP/abs/html/index.html

 

if i will make my script using that tutorial, would you take a look on it and tell me if there's something wrong (syntax)? thanks

 

Why don't you simply test it?

 

it's quite complicated and reading so many pages for a script is kind of much ... too much i'd say !