#!/bin/sh
Before you add anything else to your script, you need to alert the system that a shell script is being started. This is done using the shebang construct.# This is the pyhton3 shebang line [https://en.wikipedia.org/wiki/Shebang_(Unix)]
#!/usr/bin/python3
# A shebang line defines where the interpreter is located. In this case, the python3 interpreter is located in /usr/bin/python3. A shebang line could also be a bash, ruby, perl or any other scripting languages' interpreter, for example: #!/bin/bash.
# Without the shebang line, the operating system does not know it's a python script, even if you set the execution flag (chmod +x script.py) on the script and run it like ./script.py. To make the script run by default in python3, either invoke it as python3 script.py or set the shebang line.
# You can use #!/usr/bin/env python3 for portability across different systems in case they have the language interpreter installed in different locations.I know what you are thinking, but no Shebang is something else in bash/shell scripting
Before you add anything else to your script, you need to alert the system that a shell script is being started.
This is done using the shebang construct.