Match DOS command names to their primary purposes: (A) DBLSPACE, (B) MEM, (C) SYS, (D) DELTREE — choose the correct mapping for disk compression, memory display, DOS system transfer, and recursive directory deletion.
-
AA-4, B-3, C-2, D-1
-
BA-2, B-3, C-4, D-1
-
CA-4, B-2, C-3, D-1
-
DA-1, B-2, C-3, D-4
Answer
Correct Answer: A-4, B-2, C-3, D-1
Explanation
Introduction / Context:Legacy DOS commands still appear in certification exams and interviews because they illustrate core OS concepts: storage, memory, bootstrapping, and file-system operations. Correctly mapping these commands helps solidify command-line literacy.
Given Data / Assumptions:
- DBLSPACE: double-space compression utility for drives/files.
- MEM: reports used/free memory.
- SYS: transfers DOS system files to a disk (makes it bootable).
- DELTREE: deletes a directory and its subdirectories recursively.
Concept / Approach:Recall canonical DOS usage: DBLSPACE /DRVSPACE for compression; MEM /C /P for memory; SYS A: to make a system disk; DELTREE C:\TEMP to remove a tree.
Step-by-Step Solution:
A (DBLSPACE) → compresses files to increase capacity → 4.B (MEM) → displays memory usage → 2.C (SYS) → copies system files to target disk → 3.D (DELTREE) → deletes directory trees → 1.Verification / Alternative check:Help outputs (e.g., 'MEM /?' or DOS manuals) corroborate each mapping and the typical switches used with each utility.
Why Other Options Are Wrong:
- A-4, B-3, C-2, D-1: Swaps MEM and SYS roles.
- A-2, B-3, C-4, D-1: Assigns compression to MEM; incorrect.
- A-1, B-2, C-3, D-4: Misplaces DBLSPACE and DELTREE functions.
Common Pitfalls:
- Confusing DBLSPACE (older) with DRVSPACE (later).
- Forgetting that DELTREE is dangerous and permanent.
Final Answer:A-4, B-2, C-3, D-1