Sometimes you may miss typing a character that you wanted to type, and not notice your error until you have typed several other characters. In that case, you can use C-B to move the cursor to the left, and then correct your mistake. Aftwerwards, you can move the cursor to the right with C-F.

When you add text in the middle of a line, you will notice that characters to the right of the cursor get ‘pushed over’ to make room for the text that you have inserted. Likewise, when you delete text behind the cursor, characters to the right of the cursor get ‘pulled back’ to fill in the blank space created by the removal of the text. A list of the basic bare essentials for editing the text of an input line follows.
 

C-B
Move back one character.

C-F

Move forward one character.

Delete

Delete the character to the left of the cursor.

C-D

Delete the character underneath the cursor.

Printing characters

Insert itself into the line at the cursor.

C-_

Undo the last thing that you did. You can undo all the way back to an empty line.