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hash bang
, or 
shebang
. Basically, it just tells the kernel which 
interpreter to use in order to run the commands inside the script. There are other 
interpreters we could be using, such as 
#!/usr/bin/python
 if we were writing a 
script in the Python language. Since we're writing a Bash script, we used 
#!/bin/
bash
.
The lines that followed were simple print statements. Each one used a system 
variable, so you didn't have to declare any of those variables as they already existed. 
Here, we printed the current user's username, home directory, and default text 
editor.
The concept of scripting becomes more valuable when you start to think of things 
you do on a regular basis that you can instead automate. To be an effective Linux 
administrator, it's important to adopt the automation mindset. Again, if you are 
going to do a job more than once, script it. Here's another example script to help 
drive this concept home. This time, the script will actually be somewhat useful:
#!/bin/bash
sudo apt install -y apache2
sudo apt install -y libapache2-mod-php7.4
sudo a2enmod php7.4
sudo systemctl restart apache2

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Boosting Your Command-line Efficiency