vi editor modes: identifying a non–input command Which of the following is <em>not</em> an input-mode command in vi (i.e., it does not enter insert/replace input)?

Introduction / Context:
vi is a modal editor with distinct normal and input modes. Normal mode focuses on navigation and structural edits, while input (insert/replace) modes accept literal text. Recognizing which keystrokes change modes is critical to editing efficiently and avoiding unintended modifications.

Given Data / Assumptions:

• Standard vi/Vim behavior in normal mode.
• Commands considered: i, a, A, j, R.
• Goal: identify the one that does not enter an input (insert/replace) mode.

Concept / Approach:
Commands i (insert before cursor), a (append after cursor), A (append at end of line), and R (replace mode) all enter an input context where typed characters are inserted into the buffer. In contrast, j is a movement command that moves the cursor down one line and keeps you in normal mode without accepting typed text as input.

Step-by-Step Solution:
Press i → editor enters insert mode; status often shows -- INSERT --.Press a → append after cursor; input mode begins.Press A → jump to EOL and begin appending; input mode.Press R → enter replace mode; typing overwrites characters.Press j → cursor moves down; no mode change to input occurs.

Verification / Alternative check:
Observe the mode indicator in Vim or attempt to type letters after pressing j; the letters will be interpreted as further commands, confirming normal mode persists.

Why Other Options Are Wrong:
i starts insert mode immediately.a and A append and therefore enter input mode.R starts replace (input) mode until Esc is pressed.

Common Pitfalls:

• Confusing R (replace) with r (single-character replace in normal mode).
• Forgetting to press Esc to exit input modes before issuing navigation commands.
• Accidentally mapping j in custom vimrc to something else; defaults assume movement.

Final Answer:
j