時間戳當前時間命名

[root@search195 zfl2]# touch test$(date +%Y%m%d).txt
[root@search195 zfl2]# ls
test20180703.txt
[root@search195 zfl2]# touch test$(date +%Y%m%d_%H%M%S).txt
[root@search195 zfl2]# ls
test20180703_175917.txt test20180703.txt