Web site builder - 7. File Attributes 4. i ( immutable ): a file
7. File Attributes 4. i ( immutable ): a file or directory with this attribute set can not be modified 3 at all: it cannot be renamed, no further link can be created to it and it cannot be removed. Only root can set or clear this attribute. Note that this also prevents changes to access time, therefore you don’t need to set the A attribute when i is set. 5. s ( secure deletion ): when a file or directory with this attribute is deleted, the blocks it was occupying on disk are overwritten with zeroes. 6. S ( Synchronous mode ): when a file or directory has this attribute set, all modifications on it are synchronous and written to the disk immediately. For example, you may want to set the i attribute on essential system files in order to avoid bad surprises. Also, consider the A attribute on man pages: this prevents a lot of disk operations and, in particular, can save some battery life on laptops. Be sure to understand what adding a link means, both for a file and a directory!