[Linux] Why #!

In computing, a shebang (also called a hashing, hashpling, poundbang, or crunching) refers to the characters “#!” when they are the first two characters in an interpreter directive as the first line of a text file. In a Unix-like operating system, the program loader takes the presence of these two characters as an indication that the file is a script, and tries to execute that script using the interpreter specified by the rest of the first line in the file.

If you need python 2.7
#!/usr/bin/env python2.7

If you need python 3
#!/usr/bin/env python3



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