Shell Programming and Scripting

Enter if the env is dev or test or prod:
test
Please enter the id no :
xxxxxxx
Connected to xxxx
220 (vsFTPd 2.2.2)
331 Please specify the password.
230 Login successful.
?Invalid command
?Invalid command
?Invalid command
?Invalid command
?Invalid command
200 PORT command successful. Consider using PASV.

#!/bin/bash
echo "Enter if the env is dev or test or prod:"
while :
do
read -r INPUT_STRING
case $INPUT_STRING in
        test | TEST)
                                echo "Please enter id no : "
                                read -r input_variable
                                if [[ ${#input_variable} -ne "7" ]]
                                then
                                echo "Please check id no given"
                                exit 1
                                fi
                                HOST=XXX
                                USER=XXX
                                PASSWORD=XX
                                ftp -inv $HOST <<- EOF
                                user $USER $PASSWORD

                              mypath='/test/$input_variable/destination/'
                                if ! cd "$mypath"
                                 then
                                 exit 1
                                fi
                                mput x.csv
                              EOF
                              exit 1
                                ;;
esac
done

sh -x <script_nm.sh>

bash -x script_file