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| 2006-06-11 | 2006-07-10 | ||
| when is the Add X to directories disabled (martin) | GUID->GID (martin) | ||
| Line 18: | Line 18: | ||
| ===== Special Permissions ===== | ===== Special Permissions ===== | ||
| - | There are three special permissions. //Set UID// and //Set GUID// are used with executable files. They grant the user, who execute the file, permissions of file owner or group, respectively. //Sticky bit// for executable files makes the kernel keep the memory image of the process after it has terminated, in order to avoid the overhead of reloading it when it is re-invoked. //Sticky bit// for directories ensures that only the owner of a file can remove or delete the file or directory. | + | There are three special permissions. //Set UID// and //Set GID// are used with executable files. They grant the user, who execute the file, permissions of file owner or group, respectively. //Sticky bit// for executable files makes the kernel keep the memory image of the process after it has terminated, in order to avoid the overhead of reloading it when it is re-invoked. //Sticky bit// for directories ensures that only the owner of a file can remove or delete the file or directory. |
| Note that while non-Unix systems are usually able to map the 9 simple Unix-style permissions to their own style, they probably won't be able to handle the 3 special permissions. | Note that while non-Unix systems are usually able to map the 9 simple Unix-style permissions to their own style, they probably won't be able to handle the 3 special permissions. | ||