You can run bash using the script as an argument,
Code:
$ bash /path/to/your/script.sh
or you can turn it into a executable and run it as a command
Code:
$ cd /path/to/your
$ chmod u+x script.sh
$ ./script.sh
or add the path to it into PATH variable to run it from anywhere
Code:
$ export PATH=${PATH}:/path/to/your
$ chmod u+x /path/to/your/script.sh
$ script.sh