The Shebang Line

Well, this was an Easter Egg for me, so I will directly move on to what I
mean, without keeping you bewildered.

In computing, a shebang refers to the symbol '#!'. If it is used in a script,
it must come in the very beginning of the first line itself. Thus, the
common term shebang line.

The shebang line contains the absolute path of the interpreter binary for
the particular script you are running. On running executable script files,
the shebang will be automatically looked for and used, resulting in a 'smart
script', or so we can say.

The shebang line for Python scripts is,

#! /usr/bin python

As you might be wondering, this weird name comes from an inexact
combination of sharp (#) and bang (!), which are the Unix names of
the two characters. The other names are hashbang, hashpllng,  
poundbang, and crunchbang. Don't ask me... !!!

Interestingly, the shebang was introduced by Dennis Ritchie at Bell
Laboratories (Edition 8). It was then also added to BSD releases from
Berkeley's Computer Science Releases. 

If the absolute path for the interpreter binary remains the same in all the
machines that the script is run, then portability is achieved too.

More Easter Eggs:
1. When portability issues are encountered, the shebang line
    #! /usr/bin/env python
   may provide a solution.
2. The shebang actually represents a magic number in the executable
    file. This magic string is 0x23 0x21. Executable files that do not require
    an interpreter starts with other magic combinations.
3. The shebang line for Perl is,
    #! /usr/bin/perl