while循环
#!/bin/bash i=1 s=0 while [ $i -le 100 ] do s=$(($s+$i)) ##变量运算 i=$(($i+1)) done echo "1+2+3+...+100=$s"
until循环
i=1 s=0 until [ $i -ge 100 ] ##条件不成立才循环 do s=$(($s+$i)) i=$(($i+1)) done echo "1+2+3+...+100=$s"
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