I am trying to write a simple Bash script that will execute a command based on user-input. I have some experience with Python, but for some reason, this is giving me issues.

===================

```
*#!/bin/bash
echo "Type one of the following:"
echo " 1 - whoami"
echo " 2 - df"
echo " 3 - date"
echo " 4 - cal"
echo "===> "
read $return_value
if [ $return_value -eq 1 ]
    then
        echo $whoami
elif [ $return_value -eq 2 ]
    then
        echo $df
elif [ $return_value -eq 3 ]
    then
        echo $date
elif [ $return_value -eq 4 ]
    then
        echo $cal
else [ $return_value != 5 ]
    echo "You made an invalid Selection. Exiting."
fi

```

========================================

I continually get this set of errors and I'm at a loss.

```
Type one of the following:
 1 - whoami
 2 - df
 3 - date
 4 - cal
===> 
2
./utilities1.sh: line 10: [: -eq: unary operator expected
./utilities1.sh: line 14: [: -eq: unary operator expected
./utilities1.sh: line 18: [: -eq: unary operator expected
./utilities1.sh: line 22: [: -eq: unary operator expected
./utilities1.sh: line 26: [: !=: unary operator expected
You made an invalid Selection. Exiting.

```

Any advice or tips would be very much appreciated.