printing all of command executed in a script

[Akira Kitada <aktdjp@ybb.ne.jp>]

Hi all.

As the subject above implys, I'd like to print all of commands
executed in a shell script.
(because after a while, I always forget all of commands hided in scripts at all.
)

For example, if I have the following file named 'script',

    -- contents of a file --
    ls -l | awk '{print $5}'
    -- end of file --

and would invoked in command line like below,

    $ ./script

want to display something like

    == ls -l | awk '{print $5}' ==
    312
    312
    123313
    31232
    1233
    12213

Thanks in advance.