A shebang in a Bash script is the initial line starting with “#!” followed by the path to the interpreter. It’s crucial because it informs the system which interpreter to use for executing the script, ensuring compatibility and expected behavior across different systems. For instance, ‘#!/bin/bash’ indicates that the script should be run using bash shell. If omitted, the system defaults to the current shell which may not support all functionalities used in the script, leading to errors or unexpected outcomes.
