Linux shell shebang

Starting an script with #!  is called shebang or bang line. 

This is the absolute path to Bash interpreter. 

Almost all bash scripts often begin with the #!bin/bash. 

This ensures that Bash will be used to interpret the script. 

If you do not specify an interpreter line, the default is usually the /bin/sh. But, it is recommended that you set #!/bin/bash line