Questions[scripts](ubuntu)

How can I make a bash script executable by double clicking just like .exe files in Windows? I tried creating a launcher and assigning the script to it, but there are two consequences:

1. the terminal twinkles, disappears, and nothing is done.
2. you must specify to run in terminal in order to work.

I have a script that installs tomcat on an offline PC, including all dependencies of tomcat in the script. I need to make the script work on double clicking like windows since most who use the script will not be familiar with Ubuntu.

Forget the above explanation. I want to make a script that can be run by double-clicking on it, without using the terminal. Anybody knows how?

I've written this small utility script:

for h in $SERVER_LIST; do ssh $h "uptime"; done

When a new server is added to $SERVER_LIST, the script is stopped with:

The authenticity of host 'blah.blah.blah (10.10.10.10)' can't be established.
RSA key fingerprint is a4:d9:a4:d9:a4:d9a4:d9:a4:d9a4:d9a4:d9a4:d9a4:d9a4:d9.
Are you sure you want to continue connecting (yes/no)?

I've tried yes:

for h in $SERVER_LIST; do yes | ssh $h "uptime"; done

with no luck.

Is there a way to parametrize ssh to automatically accept any new key?

I'm writing a simple bash script, but I need it to check whether it's being run as root or not. I know there's probably a very simple way to do that, but I have no idea how.

Just to be clear:
What's a simple way to write a script foo.sh, so that the command ./foo.sh outputs 0, and the command sudo ./foo.sh outputs 1?

Oftentimes I run into small bash scripts that use this sort of syntax in if statements:

some command > /dev/null 2>&1

What is the purpose of outputting to /dev/null like that, and what does the 2>&1 mean?

It always seems to work but I'd like to know what it's doing.

I'm creating a simple bash script and I want to create a select menu in it, like this:

$./script

echo "Choose your option:"

1) Option 1  
2) Option 2  
3) Option 3  
4) Quit  

And according to user's choice, I want different actions to be executed. I'm a bash shell scripting noob, I've searched the web for some answers, but got nothing really concrete.