You will never notice something like this on FreeBSD or Linux Desktop home system or your personal UNIX or Linux workstation. However, sometime on a production UNIX server you will notice that both df (display free disk space) and du (display disk usage statistics) reporting different output. Usually df will output a bigger disk usage [...]
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Inodes are associated with precisely one directory entry at a time. However, with hard links it is possible to associate multiple directory entries with a single inode. To create a hard link use ln command:
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An inode is a data structure on a traditional Unix-style file system such as UFS or ext3. An inode stores basic information about a regular file, directory, or other file system object.
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