[root@linux ~]# ls -al
total 248
drwxr-x---   9   root    root    4096    Jul 11 14:58    .
drwxr-xr-x  24   root    root    4096    Jul  9 17:25    ..
-rw-------   1   root    root    1491    Jun 25 08:53    anaconda-ks.cfg
-rw-------   1   root    root   13823    Jul 10 23:12    .bash_history
-rw-r--r--   1   root    root      24    Dec  4  2004    .bash_logout
-rw-r--r--   1   root    root     191    Dec  4  2004    .bash_profile
-rw-r--r--   1   root    root     395    Jul  4 11:45    .bashrc
-rw-r--r--   1   root    root     100    Dec  4  2004    .cshrc
drwx------   3   root    root    4096    Jun 25 08:35    .ssh
-rw-r--r--   1   root    root   68495    Jun 25 08:53    install.log
-rw-r--r--   1   root    root    5976    Jun 25 08:53    install.log.syslog
[    1   ][ 2  ][  3   ][  4 ][    5   ][      6     ][       7          ]
[  �ݩ�  ][�s��][�֦���][�s��][�ɮ׮e�q][  �ק���  ][      �ɦW        ]

[root@linux ~]# cd /tmp
[root@linux tmp]# mkdir testing
[root@linux tmp]# chmod 744 testing
[root@linux tmp]# touch testing/testing
[root@linux tmp]# chmod 600 testing/testing
# �o�� mkdir �O�b�إߥؿ��Ϊ����O�I�O make directory ���Y�g�C
# �ڭ̥� root �������b /tmp ���U�إߤ@�ӦW�� testing ���ؿ��A
# �åB�N�ӥؿ����v���ܬ� 744 �A�ӥؿ����֦��̬� root ��I
# �t�~�A touch �i�H�Ψӫإߤ@�ӨS�����e���ɮסA�]���A touch testing/testing
# �i�H�إߤ@�ӪŪ� /tmp/testing/testing �ɮ׳�I
[root@linux tmp]# ls -al
drwxr--r--   2 root root 4096 Jul 14 01:05 testing
# �J�Ӭݤ@�U�A�ؿ����v���O 744 �A�B���ݸs�ջP�ϥΪ̧��O root ��I
# ���U�ӡA�ڭ̱N root ���������������@�먭���ϥΪ̡C
# �������t�θ̭����� dmtsai ���@�먭���ϥΪ̱b���A�ҥH������������ dmtsai 
[root@linux tmp]# su dmtsai
# ���� su �����O�O�Ψӡy�ܴ������z���@�ӫ��O�A�ڭ̥��ӷ|�ԲӤ��СC
# �`�N�ݡA���U�o�@�椤�A�o�{�ϥΪ��ܬ� dmtsai �F�A�ӥB���ܦr���ܦ� $ �F�I
# �]�N�O���A�{�b�ާ@�t�Ϊ��H�ܦ� dmtsai �F�I���� dmtsai �o�ӤH��� 
# /tmp/testing �O�ݩ� others ���v���A���L�i�H�� /tmp/testing �F���H
[dmtsai@linux tmp]$ ls -l testing   <== ���ɨ����� dmtsai
total 0
?---------  ? ? ? ?           ? testing
# �i�H�d�\�̭�����T��I�]��dmtsai �㦳 r ���v���A���L�A�����v�������A
# �ܦh��Ƴ��M�O�ݸ� (?) �Ӫ���ǩǪ����
[dmtsai@linux tmp]$ cd testing  <== ���ɨ����� dmtsai
bash: cd: testing/: Permission denied
# �o�{�F�ܡH�Y�ϧڭ̨㦳 r ���v���A���O�S�� x �A�ҥH 
# dmtsai �L�k�i�J /tmp/testing ��I
[dmtsai@linux tmp]$ exit
[root@linux tmp]# chown dmtsai testing
# �ϥ� exit �N�i�H���} su ���\��F�C�ڭ̱N�o�� testing �ؿ����֦��̳]�w��
# dmtsai �A���� dmtsai �N���� owner �F�A����o�ӨϥΪ̤S��F�©O�H
[root@linux tmp]# su dmtsai
[dmtsai@linux tmp]$ cd testing  <== ���ɨ����� dmtsai
[dmtsai@linux testing]$ ls -l  <== ���ɨ����� dmtsai
-rw-------  1 root root 0 Jul 14 01:13 testing
# �A������������ dmtsai �A���ɴN����i�J testing �F�I�d�\�@�U���e�C
# �o�{�F testing �o���ɮצs�b��I�v���O�u�� root �~����s����
# ���ڭ̴��դ@�U��_�R���O�H
[dmtsai@linux testing]$ rm testing  <== ���ɨ����� dmtsai
rm: remove write-protected regular empty file `testing'? y
# ���M�i�H�R���I�o�˲z�ѤF�ܡH�I

[root@linux ~]# ls -l /
drwxr-xr-x   2 root root  4096 Jul 14 05:22 bin
drwxr-xr-x   3 root root  4096 Jul  9 05:18 boot
drwxr-xr-x   9 root root  4880 Jul 11 00:45 dev
drwxr-xr-x   6 root root  4096 Jun 29 01:06 disk1
drwxr-xr-x   3 root root  4096 Jun 25 08:53 disk2
drwxr-xr-x  83 root root 12288 Jul 14 05:23 etc
drwxr-xr-x   6 root root  4096 May 30 20:07 home
drwxr-xr-x  10 root root  4096 Jul 14 05:23 lib
drwx------   2 root root 16384 Jun 25 16:21 lost+found
drwxr-xr-x   3 root root  4096 Jun 25 19:34 media
drwxr-xr-x   2 root root  4096 Apr 25 23:54 misc
drwxr-xr-x   2 root root  4096 May 23 12:28 mnt
drwxr-xr-x   2 root root  4096 May 23 12:28 opt
dr-xr-xr-x  59 root root     0 Jul 10 01:25 proc
drwx------   9 root root  4096 Jul 13 11:31 root
drwxr-xr-x   2 root root  4096 Jul 14 05:22 sbin
drwxr-xr-x   2 root root  4096 Jun 25 08:23 selinux
drwxr-xr-x   2 root root  4096 May 23 12:28 srv
drwxr-xr-x  10 root root     0 Jul 10 01:25 sys
drwxr-xr-x  10 root root  4096 Jun 25 20:24 system
drwxrwxrwt  10 root root  4096 Jul 14 05:23 tmp
drwxr-xr-x  14 root root  4096 Jun 25 08:27 usr
drwxr-xr-x  24 root root  4096 Jun 25 20:16 var