Vi Undo command, viundo command

Vi Undo command, viundo command

I. Overview

Vi Undo command: u and U. Here, u is the last command to undo, and U is to undo all operations of this row when the cursor is in the current row. (Derived from Learning the vi and Vim)

Ii. Example

Step 4: type the command U and roll back the text to step 3;

Step 11: Enter the command U, and the text is rolled back to step 10. Because this step does not have step_undo, step 12 typed the command u, and vi prompts Already at oldest change.

Step command step_undo context

0

1 I 0 abc

2x1 bc

3x2 c

4 U 3

5 u 2 c

6 u 1 bc

7 u 0 abc

8x7 bc

9 u 0 abc

10 u

11 U 10 c

12 u

Iii. Conclusion

In Learning the vi and Vim, U is defined as canceling all operations on the row when the cursor is in the current row. This definition is inaccurate.