按系统日期生成目录

# more PMFileCreat.sh 
#!/bin/bash

today=$(date '+%Y%m%d')

mkdir /opt/$today

#ls -lrt /opt/dayFiles/PM*|tail -6|awk '{print $9}'|xargs -i cp {} ./$today/

cd /opt/dayFiles/
ls -lrt PM*|tail -6|awk '{print $9}'|xargs -i cp {} /opt/$today/