A single inode number use to represent file in each file system. All hard links based upon inode number.
So linking across file system will lead into confusing references for UNIX or Linux. For example, consider following scenario
* File system: /home
* Directory: /home/vivek
* Hard link: /home/vivek/file2
* Original file: /home/vivek/file1
Now you create a hard link as [...]
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