2.5)  How do I read characters from the terminal in a shell script?

      In sh, use read.  It is most common to use a loop like

            while read line
            do
                    ...
            done

      In csh, use $< like this:
        
            while ( 1 )
                set line = "$<"
                if ( "$line" == "" ) break
                ...
            end

      Unfortunately csh has no way of distinguishing between a blank
      line and an end-of-file.

      If you're using sh and want to read a *single* character from the
      terminal, you can try something like

            echo -n "Enter a character: "
            stty cbreak         # or  stty raw
            readchar=`dd if=/dev/tty bs=1 count=1 2>/dev/null`
            stty -cbreak

            echo "Thank you for typing a $readchar ."

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