Shell for 循环

 # 示例1

for i in `rpm -qa | grep ptyhon`; do echo $i; done
for i in $(rpm -qa | grep python); do echo $i; done    # 推荐

# 示例2

for i in {1,2,3}; do echo $i; done
for i in host{1,2,3}; do echo $i; done
for i in host{1..10}; do echo $i; done
for i in host1 host2 host3; do echo $i; done

# 示例3

for ((i=1;i<=10;i++)); do echo $i; done

# 示例4，遍历数组

my_array = (A B C D)
for i in ${my_array[@]}; do echo $i; done