none1#!/bin/bash
"If you use another shell, substitute its path here. Comment lines start with hashes (#), but adding the bang (!) and the shell path after it is a sort of hack that will bypass this comment rule and will force the script to execute with the shell that this line points to."
http://www.howtogeek.com/67469/the-beginners-guide-to-shell-scripting-the-basics/
Vagy:
"The first line of the script is important. This is a special clue given to the shell indicating what program is used to interpret the script. In this case, it is /bin/bash. Other scripting languages such as perl, awk, tcl, Tk, and python can also use this mechanism."
http://linuxcommand.org/wss0010.php#write