Linux中{n..m}的用法

面试题一道：一条命令创建1.txt,2.txt....20.txt文件20个，再用一条命令删除除了10.txt之外的其他文件，在question文件夹内完成。

[root@localhost question]# pwd
/root/question
[root@localhost question]# touch {1..20}.txt 
[root@localhost question]# ls
10.txt  11.txt  12.txt  13.txt  14.txt  15.txt  16.txt  17.txt  18.txt  19.txt  1.txt  20.txt  2.txt  3.txt  4.txt  5.txt  6.txt  7.txt  8.txt  9.txt
[root@localhost question]# cd
[root@localhost ~]# find /root/question/ -type f ! -name "10.txt" | xargs rm -f 
[root@localhost ~]# cd question
[root@localhost question]# ls
10.txt

题目虽小，考查的却是基本功。