Entering printable keys generally inserts new text into the buffer (unless in overwrite mode, see below). Other special keys can be used to modify the text in the buffer. In the description of the keys below, ^n means Control-n, or holding the CONTROL key down while pressing "n". Errors will ring the terminal bell.
^A/^E : Move cursor to beginning/end of the line. ^F/^B : Move cursor forward/backward one character. ^D : Delete the character under the cursor. ^H, DEL : Delete the character to the left of the cursor. ^K : Kill from the cursor to the end of line. ^L : Redraw current line. ^O : Toggle overwrite/insert mode. Initially in insert mode. Text added in overwrite mode (including yanks) overwrite existing text, while insert mode does not overwrite. ^P/^N : Move to previous/next item on history list. ^R/^S : Perform incremental reverse/forward search for string on the history list. Typing normal characters adds to the current search string and searches for a match. Typing ^R/^S marks the start of a new search, and moves on to the next match. Typing ^H or DEL deletes the last character from the search string, and searches from the starting location of the last search. Therefore, repeated DEL's appear to unwind to the match nearest the point at which the last ^R or ^S was typed. If DEL is repeated until the search string is empty the search location begins from the start of the history list. Typing ESC or any other editing character accepts the current match and loads it into the buffer, terminating the search. ^T : Toggle the characters under and to the left of the cursor. ^U : Kill from beginning to the end of the line. ^Y : Yank previously killed text back at current location. Note that this will overwrite or insert, depending on the current mode. TAB : By default adds spaces to buffer to get to next TAB stop (just after every 8th column), although this may be rebound by the programmer, as described below. NL, CR : returns current buffer to the program.DOS and ANSI terminal arrow key sequences are recognized, and act like:
up : same as ^P down : same as ^N left : same as ^B right : same as ^F