#!/bin/bash Scripts can be written for all kinds of interpreters — bash, tsch, zsh, or other shells, or for Perl, Python, and so on. The "#!" combo is called a shebang by most Unix geeks. This is used by the shell to decide which interpreter to run the rest of the script. #for running bash script bash script.sh #you can also make ur script file as executable chmod 755 script.sh chmod +x script.sh