/data/source and /backup/source.link are on different mounted filesystems.
Create a link from source.link that refers to source.
Which type can be used?
Hard links share an inode and cannot cross filesystem boundaries. Symbolic links store a path and can cross those boundaries.
Detailed explanation
Correct. A symbolic link can refer across mounted filesystem boundaries.
Incorrect. A hard link cannot cross to another filesystem.
Incorrect. Symbolic links make the cross-filesystem reference possible.
Incorrect. Link count does not change the filesystem restriction for hard links.
Try it yourself
An example you can run in a temporary verification environment.
ln --helpExpected result
-sでsymbolic linkを作成する説明。hard linkの境界はlink(2)でEXDEVとして定義されるKey points
- Hard links stay on one filesystem
- Symbolic links can cross
- They refer to a path
Notes
- Environment: GNU coreutils 9.x／Linux
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.