Control characters provide many functions such as editing, program control, and output control.
Occasionally, a keyboard might not include common special keys. If this is the case, you will need to know a few of the following control characters. These control characters are summarized in table 3.1 To use a control character, simultaneously hold the CTRL key and press another key. If this happens, you will need to use h to back up a letter. If you'd like to erase the previous word, use w , and to erase the whole line, use u .