#!/bin/bash

not123=456
name="Scott Bot"

# Test if not123 is not equal to 123
# Operators such as >= <= < > and == are also able to be used
if (( $not123 != 123 ))
then
    echo -e "This is an integer test. Notice how the conditional statement is encapsulated in '((' and '))'s\n"
elif (( $not123 > 123 ))
then
    echo "This is an else if statement."
else
    echo "This happens if nothing else happens"
fi

# Test if 'name' is equal to 'Scott Bot'
# Operators such as >= <= < > and == are also able to be used
if [[ $name == "Scott Bot" ]]
then
    echo "This is a string test. Notice the '[[' & ']]'s encapsulating the if statement"
fi

# Print 'file.txt exists!' if file.txt exists
if [ -e file.txt ]
then
    echo "file.txt exists!"
fi

# Print 'The directory exists!' if 'directory/' exists and is a directory rather then a file
if [ -d /directory/ ]
then
    echo "The directory exists!"
fi

# Print 'The file exists!' if 'directory/' exists and is a file rather then a directory
if [ -f file ]
then
    echo "The file exists!"
fi

# Print 'The TEXT file exists!' if 'text.txt' exists and is character encoded (is a text file)
if [ -c text.txt ]
then
    echo "The TEXT file exists!"
fi

# Print 'The BINARY file exists!' if 'exec.exe' exists and is NOT character encoded (anything but a text file)
if [ -b exec.exe ]
then
    echo "The BINARY file exists!"
fi

# Print 'File is not empty' if file.txt contains content
if [ -s file.txt ]
then
    echo "File is not empty!"
fi

# Print "File is able to be executed" is file.exe has permission to be executed
if [ -x file.exe ]
then
    echo "File is able to be executed"
fi

# Print "File is able to be read" is file.exe has permission to be read
if [ -r file.exe ]
then
    echo "File is able to be read"
fi

# Print "File is able to be written to" is file.exe has permission to be written to
if [ -w file.exe ]
then
    echo "File is able to be written to"

# Get number from user
read number

# If number specified by user is in range [0, 100], echo 'The number is in range'
# Notice the '&&' inside the double parentheses. They can also be used inside of double square brackets.
if (( number >= 0 && number <= 100 ))
then
    echo "The number is in range"
fi

# Get string from user
read string

# If the string is one of your 'names' then print 'Congrats, you guessed one of my names!'
if [[ string == "quantum" || string == "ech" ]]
then
    echo "Congrats, you guessed one of my names!"
fi

# '[[]]', '(())' and '[]' are just delineated expressions that evaluate to a Boolean value
# The 'if' construct could easily be written as
if true
then
    echo "This will always run"
fi
# Because if statements simply get passed Boolean values like all languages.

# This implies that you can also write the same 'string' variable comparison as
if [[ string == "quantum" ]] || [[ string == "ech" ]]
then
    echo "Congrats, you guessed one of my names!"
fi