How does linux view processes that have deleted space but have not been released

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Background: rm deleted files or folders, and when df checked it, it found that no disk space was released.

Execute the command lsof-n | grep deleted.

[root@localhost ~] # lsof-n | grep deleted # found several deleted but no free space.

[root@localhost] # kill-9 4291

Then take a look at df and find that the space is reduced.

[root@localhost ~] # df-lh

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