Create a file "1 week ago"

============================

#root@ubun1204:/root/study# date +%Y%m%d
20140718
root@ubun1204:/root/study# touch -d "1 week ago" file2
root@ubun1204:/root/study# touch -d "10 day ago" file1
root@ubun1204:/root/study# ls -l file1 file2
-rw-r--r-- 1 root root 0 Jul  8 23:10 file1
-rw-r--r-- 1 root root 0 Jul 11 23:10 file2

Create a file which date is several days ago