Shell Programming and Scripting

cat color_names.txt

Blue
Yellow
Red

#prompt user to enter colour
read -p "Please enter a text colour: " TextColour


#Put variable into a text file
echo $TextColour > ./TextColour.txt


#Loop until the colour is correct

while read -p "enter colour: "  colour 
do 
    echo $colour; 
done

while read -p "enter colour: "  colour 
do 
    if grep -q ${colour:-foo} /tmp/colour.txt
    then
       echo right
       break          # exit the loop when a colour is in the file. 
    fi
done

read -p "colour : " colour

until grep -i "$colour" "colour_names.txt"
do *something*
done

until   echo "$TextColour" | grep -iq "^"$TextColour"$" color_names.txt
 do
  read -p "please re-try: " TextColour
done