did that user have the permission to do that?
you can type "ls -l" to show the detail information, such as :
Code:
[zhyfly]@[zhy2fly][~/tex](0)$ls -l
total 92
-rw-r--r-- 1 zhyfly zhy 0 2005-12-18 20:55 missfont.log
-rw-r--r-- 1 zhyfly zhy 0 2005-12-18 22:06 test.aux
-rw-r--r-- 1 zhyfly zhy 696 2005-12-18 20:57 test.dvi
-rw-r--r-- 1 zhyfly zhy 0 2005-12-18 22:06 test.log
-rw-r--r-- 1 zhyfly zhy 10672 2005-12-19 01:55 test.pdf
-rw-r--r-- is the permission for the type of the file "-"
the permission of the owner: "rw-"
the permission of the group: "r--"
the permission of the others: "r--"
check that out maybe help.