Linux for循环之列表for循环详解

for variable in (list)
do 
    command
    command
    ...
done

#!/bin/bash

#使用列表for循环显示5次欢迎操作
for variable  in 1 2 3 4 5 
do
    echo "Hello, welcome $variable  times "
done

[zhangqi@localhost shellscript]$ sh for_ex1.sh 
Hello, welcome 1  times 
Hello, welcome 2  times 
Hello, welcome 3  times 
Hello, welcome 4  times 
Hello, welcome 5  times 
[zhangqi@localhost shellscript]$ 

#!/bin/bash

#使用列表for循环显示5次欢迎操作
for variable  in {1..5} 
do
    echo "Hello, welcome $variable  times "
done

[zhangqi@localhost shellscript]$ sh for_ex2.sh 
Hello, welcome 1  times 
Hello, welcome 2  times 
Hello, welcome 3  times 
Hello, welcome 4  times 
Hello, welcome 5  times 
[zhangqi@localhost shellscript]$ 

#!/bin/bash

#使用列表for循环显示5次欢迎操作
for variable  in $(seq 1 5) 
do
    echo "Hello, welcome $variable  times "
done

#!/bin/bash

#使用列表for循环显示5次欢迎操作
for variable  in {1..5..2} 
do
    echo "Hello, welcome $variable  times "
done

[zhangqi@localhost shellscript]$ sh for_ex4.sh 
Hello, welcome 1  times 
Hello, welcome 3  times 
Hello, welcome 5  times 
[zhangqi@localhost shellscript]$ 

[zhangqi@localhost shellscript]$ cat for_ex5.sh 
#!/bin/bash

#使用列表for循环显示5次欢迎操作
for variable  in $(seq 1 2 5) 
do
    echo "Hello, welcome $variable  times "
done

[zhangqi@localhost shellscript]$ sh for_ex5.sh 
Hello, welcome 1  times 
Hello, welcome 3  times 
Hello, welcome 5  times 
[zhangqi@localhost shellscript]$ 

[zhangqi@localhost shellscript]$ cat for_ex6.sh 
#!/bin/bash

#使用列表for循环显示周一到周日对应的英文
for day in Monday Tuesday Wednesday Thursday Friday Saturday Sunday 
do
    echo "$day"
done

[zhangqi@localhost shellscript]$ sh for_ex6.sh 
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
[zhangqi@localhost shellscript]$ 

[zhangqi@localhost shellscript]$ cat for_ex7.sh 
#!/bin/bash

#使用命令打印数组
for variable  in `ls /` 
do
    echo "Every directory is $variable "
done

[zhangqi@localhost shellscript]$ sh for_ex7.sh 
Every directory is bin 
Every directory is boot 
Every directory is dev 
Every directory is etc 
Every directory is home 
Every directory is lib 
Every directory is lost+found 
Every directory is media 
Every directory is mnt 
Every directory is opt 
Every directory is proc 
Every directory is root 
Every directory is sbin 
Every directory is selinux 
Every directory is srv 
Every directory is sys 
Every directory is tmp 
Every directory is usr 
Every directory is var 
[zhangqi@localhost shellscript]$ 

[zhangqi@localhost shellscript]$ cat for_ex8.sh 
#!/bin/bash

echo "number of arguments is $#"

echo "What you input is :"

#使用命令打印数组
for argument  in "$*" 
do
    echo "$argument "
done

[zhangqi@localhost shellscript]$ sh for_ex8.sh 1 hello shell
number of arguments is 3
What you input is :
1 hello shell 
[zhangqi@localhost shellscript]$