A simple script would look like:

#!/bin/sh

echo "Hello, world!"

Where the first line consists of "#!<path to the shell to use - usually
/bin/sh>" and then the rest of the file  consists of the commands to execute  -
basically anything that you can do from the command  line.

Once the file has been saved, execute 'chmod 755 <script_file>' and you will
be able to use your script just like any other program on the system.

Thanks but tell me is this a right to execute  a java or anyother command  in unix

#!/bin/sh

java Helloworld.java

and if i have saved it with test.bat file  then i'll execute it like this?

chmod 755 test.bat
but what is this 755?

to set the file  permission so it could be executed by you.
try to search bash programming in the google.

you put your command  in a file  of any name and make it executable with the
chmod "+x" command.

for help on chmod enter the command
man chmod