關於檔案使用權限設定問題

[okehank]

一直搞不懂
real user ID , effective user ID 和 saved user ID
這幾個之間的關係..
請問有沒有這方面較清楚的說明呢?


thank you in advance

[訪客]

Real user/group ID: who you really are
Effective user/group ID: determine file access permission
...
Saved set-user/group-ID = owner of the program with set-user-id bit set

reference:http://216.239.59.104/search?q=cache:gjtL3iDjXOEJ:mll.csie.ntu.edu.tw/course/sysprog_s06/ch8a.ppt+Effective+User+ID&hl=zh-TW&ct=clnk&cd=8&gl=tw