############ BASICS OF BASH ##################

# Comments in bash can be made like this, by prepending the line with a hashtag.

At the beginning of every bash file you want to first navigate to your /usr/bin directory and create a file ending in .sh

Once there and having created a .sh file, you want to initialize your bash file with a shebang, which tells the bash
terminal what kind of file it is

#! /bin/bash

VARIABLES="Can be defined like this"

Some examples of Variables include:

TITLE="System Information Report for $HOSTNAME"
CURRENT_TIME="$(date +"%x %r %Z")"
TIMESTAMP="Generated $CURRENT_TIME, by $USER"

functions () {
	echo "can be created like this, just don't forget to: "
	return
}

Some examples of functions include:

report_uptime () {
	cat <<- _EOF_
		<h2>System Uptime</h2>
		<pre>$(uptime)</pre>
		_EOF_
	return
}

report_disk_space () {
	cat <<- _EOF_
		<h2>Disk Space Utilization</h2>
		<pre>$(df -h)</pre>
		_EOF_
	return
}

report_home_space () {
	if [[ "$(id -u)" -eq 0 ]]; then
		cat <<- _EOF_
		<h2>Home Space Utilization</h2>
		<pre>$(du -sh /home/*)</pre>
		_EOF_
	else
		cat <<- _EOF_
		<h2>Home Space Utilization ($USER)</h2>
		<pre>$(du -sh $HOME)</pre>
		_EOF_
	fi
	return
}


cat <<- _EOF_ command acts very much like an echo"", but doesn't require the quotation marks, which can be a useful feature

If statements are also seen above, where [[]] sets a test command, which determines if it is true

basic boolean expressions can be used using this syntax such as [[ 0 -get 1 ]] tests whether 0 is greater than negative one, so for example

if [[ 0 -gt -1]]; then
	echo "0 is greater than -1"
else
	echo "0 is not greater than -1"
fi

Notice the use of fi in bash, which is required to end the if statement, otherwise bash will expect further if, elif, or else statements