# 新建文件
> touch x.txt
> ls
x.txt

# 新建多个文件
> touch {a,b}.txt
> ls
a.txt  b.txt

# 新建多个连续文件
> touch {1..10}.txt
> ls
10.txt  2.txt  4.txt  6.txt  8.txt
1.txt   3.txt  5.txt  7.txt  9.txt