31.5 suid

suid->set user idubuntu sgid->set group idui # touch test03it   //加suid和sgid权限test mf@ubuntu:~/lu$ chmod 4755 test03; ls -l test03 -rwsr-xr-x 1 mf mf    0 Oct 12 14:57 test03*权限   //加suid和sgid权限touch

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