shell編程-while循環

• 給大家看我第一次寫的腳本，報瞭如下錯誤

#!/bin/bash

declare -i s
declare -i i
s=0
i=0
while [ $i -le "100" ]
        do
                $s=$(( $s + $i ))
                $i=$(( $i + 1 ))
        done
echo "The sum is  $s" 

/whtest.sh: line 9: 0=0: command not found
./whtest.sh: line 10: 0=1: command not found
./whtest.sh: line 9: 0=0: command not found
./whtest.sh: line 10: 0=1: command not found
./whtest.sh: line 9: 0=0: command not found
^C

• 經過對比排查，發現是遞加出了問題
  既然是賦值，就不能是$s=$s+1
  

[root@localhost shelltest]# vim untest.sh 

#!/bin/bash

declare -i i
declare -i s
i=0
s=0
until [ $i -gt 100 ]
        do
                s=` expr  $s + $i `
                i=` expr  $i + 1 `
        done
echo "The sum is $s"