[root@oldboy oldboy]# lltotal 0-rw-r--r-- 1 root root 0 Nov 13 19:38 stu_102999_1_.jpg-rw-r--r-- 1 root root 0 Nov 13 19:38 stu_102999_2_.jpg-rw-r--r-- 1 root root 0 Nov 13 19:38 stu_102999_3_.jpg-rw-r--r-- 1 root root 0 Nov 13 19:38 stu_102999_4_.jpg [root@oldboy oldboy]# rename .jpg .oldboy *[root@oldboy oldboy]# lltotal 0-rw-r--r-- 1 root root 0 Nov 13 19:38 stu_102999_1_.oldboy-rw-r--r-- 1 root root 0 Nov 13 19:38 stu_102999_2_.oldboy-rw-r--r-- 1 root root 0 Nov 13 19:38 stu_102999_3_.oldboy-rw-r--r-- 1 root root 0 Nov 13 19:38 stu_102999_4_.oldboy-rw-r--r-- 1 root root 0 Nov 13 19:38 stu_102999_5_.oldboy