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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