shell常用基本命令之七 shift

1.shift的功能

2.举例

[root@nn shell]# cat shift_fun.sh
#!/bin/bash

echo "number of arguments is $#"

echo "What you input is:"
while [[ "$*" != "" ]]
do
echo "$1"
shift
done
[root@nn shell]# ./shift_fun.sh hello world
number of arguments is 2
What you input is:
hello
world
[root@nn shell]#

#!/bin/bash

while [ "$#" -gt 0 ]
do
echo $*
shift
done

运行结果：
[root@nn shell]# ./shift_fun1.sh 9 8 7 6 5 4 3 2 1
9 8 7 6 5 4 3 2 1
8 7 6 5 4 3 2 1
7 6 5 4 3 2 1
6 5 4 3 2 1
5 4 3 2 1
4 3 2 1
3 2 1
2 1
1