In this video we discuss the logical AND and the logical OR operators in bash.
you can get a more in depth explanation of these operators here
https://en.wikipedia.org/wiki/Logical_conjunction
***Source code for the script used in this video***
###Bash Logical Or and Logical And###

####Truth Tables###
#     True = True
#     False = False
#     True and True   = True
#     True and False and True and True ...  = False
#     False and True  = False
#     False and False = False
#     True or True    = True
#     True or False   = True
#     False or True or False or False ...   = True
#     False or False  = False

true_var=true
false_var=false
#you don't have to compare a boolean variable to true, the below way is much better
if $true_var = true; then
    echo 'This variable is true'
else
    echo 'This variable is false'
fi

if $true_var; then
    echo 'This variable is true'
else
    echo 'This variable is false'
fi

if $true_var; then
    echo 'This variable is true'
else
    echo 'This variable is false'
fi

###Logical And

if $true_var && $false_var ; then
    echo 'This variable is true'
else
    echo 'This variable is false'
fi

if $false_var && $false_var ; then
    echo 'This variable is true'
else
    echo 'This variable is false'
fi

###Logical Or

if $true_var || $false_var ; then
    echo 'This variable is true'
else
    echo 'This variable is false'
fi

if $true_var || $true_var ; then
    echo 'This variable is true'
else
    echo 'This variable is false'
fi

***End First Script***
***realistic example of using and or***
echo "enter you age"
read age
echo "are you a felon or are you innocent?"
read criminal_status
years=$(expr 18 - $age)

if [ $age -ge 18 ] && [ $criminal_status == "innocent" ]; then
    echo 'You may purchase a firearm'
elif [ $age -le 18 ] && [ $criminal_status == "innocent" ]; then
    echo "You are too young kid, come back in ${years} years"
elif [ $age -le 18 ] && [ $criminal_status == "felon" ]; then
    echo "You are on a bad road kid, stay in school"
elif [ $age -ge 18 ] && [ $criminal_status == "felon" ]; then
    echo "You are a felon, we can't sell you a firearm!"
fi
***End of second script***

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