clear

t=1

while [ $t -eq 1 ]

do

          clear

          echo -e -n "Nhap so:\t"

          read so

          if [ ${#so} -eq 3 ]; then

                   a=$(($so % 10))

                   b=$((($so / 10) % 10))

                   c=$((($so / 100) % 10))

                   echo -en "Tong cac ky so la: `expr $a + $b + $c`"

          else

                   echo -en "\nNhap so trong pham vi tu 100 -> 999."

          fi

         

          while [ $t -ne 0 ]

          do

                   echo -en "\nBan co muon tiep tuc? (Nhap 0 hoac 1)\t"

                   read t

                   if [ $t -eq 1 ];then

                             break

                   fi

          done

done
Tags: Lập trình Shell, lập trình Linux, Ubuntu, Script tính tổng