bash语句总结

shell逻辑语句总结

if else elif

if expr1
then
commands
elif expr2
then
commands
else
commands
fi

---

while

while expr
do
commands
done

for

for x in lists
do
commands
done

case

case expr in
pattern1)
commands
;;
pattern2)
commands
;;
*)
commands
;;
esca

until

和while差不多但是，当为错误时进入循环，而不是正确进入循环

until expr
do 
commands
done

break&continue

break [n]

continue [n]

select

实际上这并不是一个逻辑语句，其主要用于创建菜单。并且其是一个死循环，记得使用break语句来退出循环。

select x in lists
do
commands
done

shift

shift [n]

参考资料

https://math.ecnu.edu.cn/~jypan/Teaching/Linux/Linux08/lect12_Shell_Prog.pdf

https://math.ecnu.edu.cn/~jypan/Teaching/Linux/Linux08/lect14_Review.pdf