Shell Programming and Scripting

if [ -f $directory ]   
then
#This will take the number and/or name from the user storing it into $input
        echo -e "Input name or/and number: \c";
        read input
        #This if statement checks to see if the user inputted 1 argument ie name OR number or 2 ie name AND number
        if [ $# -ne 2 ]              
        then
        #This line checks to see if the input contains only digits or hyphens
                if echo $input | grep -qv '[^0-9-]' 
                        then
                        #This case will take the input and check it is a valid number (8digits not starting with 0)
                        case $input in
                        [1-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9])
                        continue;;
                        *) echo "invalid number"; exit
                        esac
else
                        #This case will test if an inputed name is valid.
                        case $input in
                        [!\ a-zA-Z]*) echo "invalid name" ; exit
                        continue ;;
                        *[a-zA-Z]*)
                        continue ;;
                        esac
                fi
        #If the name or number was valid this block of commands will run, checking the #directory for the name/number and returning either no such entry or the entry itself.
        grep "$input" teledir.txt>/dev/null     
        work=$?
        if [ $work -ne 1 ]
        then
        grep "$input" teledir.txt
     else
        echo "No such entry"
        fi
          
        #If 2 statements were inputted this block of commands is run (ie similar but if      #entry doesn't exist it adds it instead of returning no such entry
        else
        echo "2 arguments entered"
        fi 
           
#Tells the user the Teledir.txt was not found
else
echo "Teledir.txt does not exist in this directory"
fi