Some Special Characters(A-Z) Uses

Ctl-A	Moves cursor to beginning of line of text(on the commandline)
Ctl-B	Backspace (nondestructive).
Ctl-C	Break. Terminate a foreground job
Ctl-D	Log out from a shell (similar to exit).
Ctl-E	Moves cursor to end of line of text (on the command-line).
Ctl-F	Moves cursor forward one character position(on the command-line).
Ctl-G	BEL. On some old-time teletype terminals, this would actually ring a bell.In an xterm it might beep.
Ctl-H	Rubout (destructive backspace). Erases characters the cursor backs over while  backspacing
Ctl-I	Horizontal tab.
Ctl-J	Newline (line feed). In a script, may also be expressed in octal notation -- '\012' or in hexadecimal -- '\x0a'
Ctl-K	Vertical tab.  When typing text on the console or in an xterm window, Ctl-K erases from the  character under the cursor to end of line. Within a script, Ctl-K may behave differently, as in Lee Lee Maschmeyer's example, below
Ctl-L	Formfeed (clear the terminal screen). In a terminal, this has the same effect as the  clear  command. When sent to a printer, a Ctl-L causes an advance to end of the paper sheet.
Ctl-N	Ctl-N Erases a line of text recalled from history buffer [20] (on the command-line).
Ctl-O	Issues a newline (on the command-line).
Ctl-P	Recalls last command from history buffer (on the terminal.
Ctl-Q	Resume (XON). This resumes stdin in a Ctl-R       Backwards search for text in history bu
Ctl-R	Backwards search for text in history buffer(on the command-line).
Ctl-S	Suspend (XOFF).This freezes stdin in a terminal.
Ctl-T	Reverses the position of the character the cursor is on with the previous character(on the command-line).
Ctl-U	Erase a line of input, from the cursor backward to beginning of line. In some settings, Ctl-U erases the entire line of input, regardless of cursor position.
Ctl-X	In certain word processing programs, Cuts highlighted text and copies to clipboard.
Ctl-Y	Pastes back text previously erased (with Ctl-U or Ctl-W).
Ctl-Z	Pauses a foreground job.