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An inode stores basic information about a regular file, directory, or other file system object. It contains a list of direct, indirect, and doubly and triply indirect pointers. On some FileSystems, very small files can be stored directly in the [Inode] itself. The inode number is a unique integer assigned to the device upon which it is stored. All files are hard links to inodes. Whenever a program refers to a file by name, the system conceptually uses the filename to search for the corresponding inode. Sophisticated FileSystems create [Inode]s on demand, but with most, the number of [Inode]s on a [Partition] has to be decided on during FileSystem creation. It is rare to run out of [Inode]s unless you have an unusual usage profile such as storing a news spool or [Squid] cache. Exhaustion of the inodes will prohibit the creation of additional files even if sufficient HDD space exists. !!How many Inodes do I have free? *df - i !!What information does an [Inode] store? Note : Inodes do NOT contain filenames. * The size of the file in bytes. * The file's physical location (the addresses of the blocks of storage containing the file's data on a HDD) * The file's permissions. * The Device ID * The User ID of the file's owner. * The Group ID of the file. * Timestamps (ctime,mtime and atime). See [FileTimes] * A reference count telling how many hard links point to the [Inode]. !!View Inode Information for a particular file. For example [PhilMurray's|PhilMurray] famous macaroni and cheese recipe: <verbatim> $stat macaroni_and_cheese File: `macaroni_and_cheese' Size: 1965 Blocks: 8 IO Block: 4096 regular file Device: 305h/773d Inode: 2775423 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 1000/ staz) Gid: ( 1000/ staz) Access: 2007-05-16 00:21:17.000000000 +1200 Modify: 2007-05-16 00:21:16.000000000 +1200 Change: 2007-05-16 00:21:16.000000000 +1200 </verbatim> !!How to obtain a file's [Inode] number *ls -i <file>
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