linux - interactive Shell Script -

how create simple shell script asks simple input user , runs command associated predefined choice, example

if "on" backup server elseif "off" delete backups elseif "grey" send backups endif 

you can take input user via read , can use case ... esac block different things.

read takes argument, name of variable store it's value

read foo 

will take in vaue user , store in $foo.

to prompt user input need use echo.

echo "what favourite color?" read color 

finally, shell scripts support case operator. take form

case "value" in     "choice)         # stuff         ;; esac 

putting together:

echo "which choice like? \c" read choice  case "$choice" in      on)         # stuff         ;;     off)         # different stuff         ;;     *)         echo "$choice not valid choice"         ;; esac