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You will run into issues if a variable - "Foo" contains spaces. To solve that, use:

 if [[ -n "${Foo/[ ]*\n/}" ]];then

    echo "Foo is not empty and contains non space characters"

fi


# Another way to solve the same problem: Take spaces out in Foo & check if Foo is empty

 if [[ -z "${Foo// }" ]];then

     echo "Foo is empty"

 fi

To figure out if a variable "Foo" is empty and also contains no spaces (or no whitespace as some people refer it).

 if [[ -n "${Foo/[ ]*\n/}" ]];then

    echo "Foo is not empty and contains non space characters"

fi


# Another way to solve the same problem: Take spaces out in Foo & check if Foo is empty

 if [[ -z "${Foo// }" ]];then

     echo "Foo is empty"

 fi

You will run into issues if the variable contains spaces. To solve that, use:

 if [[ -n "${variable/[ ]*\n/}" ]];then

    echo "variable is not empty and contains non space characters"

fi


# Another way to solve the same problem: Take spaces out in $variable & check if $variable == NULL

 if [[ -z "${variable// }" ]];then

     echo "variable is empty"

 fi

You will run into issues if a variable - "Foo" contains spaces. To solve that, use:

 if [[ -n "${Foo/[ ]*\n/}" ]];then

    echo "Foo is not empty and contains non space characters"

fi


# Another way to solve the same problem: Take spaces out in Foo & check if Foo is empty

 if [[ -z "${Foo// }" ]];then

     echo "Foo is empty"

 fi

You will run into issues if the variable contains spaces. To solve that, use:

if [[ -n "${variable_name/[ ]*\n/}" ]];then         

    echo "variable is Not empty and contains non space characters"

fi


# Another way to solve the same problem: Take spaces out in $variable_name & check if $variable_name == NULL

 if [[ -z "${variable_name// }" ]];then                    

     echo "variable is empty"

 fi

You will run into issues if the variable contains spaces. To solve that, use:

 if [[ -n "${variable/[ ]*\n/}" ]];then

    echo "variable is not empty and contains non space characters"

fi


# Another way to solve the same problem: Take spaces out in $variable & check if $variable == NULL

 if [[ -z "${variable// }" ]];then

     echo "variable is empty"

 fi