Linux provides a command-line utility rm that has the purpose ofremoving a file from a directory.

When executing rm inside of the strace utility we can see thatrm makes a system call to unlink().

Here is an example.

$ strace rm test.txt

... unlinkat(AT_FDCWD, "test.txt", 0) = 0

Question :

Explain why rm unlinks the file. How does unlinkingresult in the removal of the file? and

Why does Linux not have a system call such as delete()that rm could use to directly remove the file?