# All before the 10th day, excluding the files on the 10th day
$ find -mtime +10 -exec rm -rfv {} \;
# 10 days ago, the file of the current day
$ find -mtime 10 -exec rm -rfv {} \;
# Within 10 days, including today's documents, but excluding the 10th day's documents
$ find -mtime -10 -exec rm -rfv {} \;
#Find files belonging to the user test in the system
$find / -user test