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在 Shell 脚本中，常见的循环写法有以下几种：

1. for 循环

遍历列表

for i in 1 2 3 4 5
doecho "Number: $i"
done

遍历范围

for i in {1..5}
doecho "Number: $i"
done

遍历命令输出

for file in $(ls)
doecho "File: $file"
done

C 风格 for 循环

for ((i=0; i<5; i++))
doecho "Number: $i"
done

2. while 循环

count=1
while [ $count -le 5 ]
doecho "Count: $count"count=$((count + 1))
done

3. until 循环

until 循环与 while 循环相反，条件为假时执行循环体。

count=1
until [ $count -gt 5 ]
doecho "Count: $count"count=$((count + 1))
done

4. select 循环

select 循环用于创建简单的菜单。

select option in "Option 1" "Option 2" "Option 3" "Quit"
docase $option in"Option 1")echo "You chose Option 1";;"Option 2")echo "You chose Option 2";;"Option 3")echo "You chose Option 3";;"Quit")break;;*)echo "Invalid option";;esac
done

5. 无限循环

使用 while

while true
doecho "This is an infinite loop"sleep 1
done

使用 for

for ((;;))
doecho "This is an infinite loop"sleep 1
done

6. 嵌套循环

for i in {1..3}
dofor j in {1..3}doecho "i: $i, j: $j"done
done

7. 循环控制

• break：跳出循环
• continue：跳过当前迭代，继续下一次循环

for i in {1..10}
doif [ $i -eq 5 ]thenbreakfiecho "Number: $i"
done

for i in {1..10}
doif [ $i -eq 5 ]thencontinuefiecho "Number: $i"
done

这些是 Shell 脚本中常见的循环写法，可以根据具体需求选择合适的循环结构。