On Unix/Linux systems, which command is used to remove an empty directory from the filesystem?

Introduction / Context:
Managing directories from the shell requires specific commands. Unlike removing files, removing directories safely ensures that filesystem structure is not corrupted. There is a specific command in Linux for deleting empty directories.

Given Data / Assumptions:

• The directory is empty (contains no files or subdirectories).
• We are using a Unix/Linux shell with standard GNU coreutils.

Concept / Approach:

The rmdir command removes directories, but only if they are empty. For non-empty directories, rm -r is needed. Using the correct command prevents accidental recursive deletions.

Step-by-Step Solution:

Verification / Alternative check:

Check with ls before and after removal. rmdir will fail on directories with contents, which is expected behavior.

Why Other Options Are Wrong:

• rdir: not a valid Linux command.
• remove: command does not exist in standard Unix.
• rd: DOS/Windows command, not Linux.
• None: incorrect because 'rmdir' is correct.

Common Pitfalls:

• Confusing 'rmdir' with 'rm -r'; rmdir only works for empty directories.
• Using DOS-style 'rd' on Linux, which will not work.

Final Answer:

rmdir.