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Cursor back (CUB)
ESC [ N DCUB moves the cursor back (left) by N columns. The sequence is
ESC [ N D (default N=1). The cursor stops at the left edge of the screen and does not wrap to the previous line.How this is testedautomated
Write "ABC" then send
Write "ABC" then send
\x1b[2D (CUB 2), verify cursor column is 1 (0-based).The same probe runs against headless backends (via Termless) and real terminal apps (via a daemon launched in each terminal). This lets us distinguish parser correctness from rendering correctness.
Analysis2026-04-18
Supported by 8 of 12 terminals (67%). Not supported by: Terminal.app, Warp, Cursor, VS Code. Part of the Core TUI baseline.
Supported by 10 of 14 backends (71%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| Kitty | 0.46.2 | ✓ yes | |
| VS Code | ✗ no | ||
| Warp | ✗ no | ||
| Cursor | ✗ no | ||
| Terminal.app | ✗ no |