Technical information
Table 1–1: Console I/O Mode Control Characters
Character Action
Return
also <CR> The carriage return ends a command line. No action is taken on
a command until after it is terminated by a carriage return. A
null line terminated by a carriage return is treated as a valid, null
command. No action is taken, and the console prompts for input.
Carriage return is echoed as carriage return, line feed (<CR><LF>).
X
(rubout) When you press
x
(rubout), the console deletes the previously typed
character. The resulting display differs, depending on whether the
console is a video or a hardcopy terminal.
For hardcopy terminals, the console echoes a backslash (\)
followed by the character being deleted. If you press additional
rubouts, the additional deleted characters are echoed. If you type a
non-rubout character, the console echoes another backslash, followed
by the character typed. The result is to echo the characters deleted,
surrounding them with backslashes. For example:
EXAMI;E
X X
NE<CR>
The console echoes: EXAMI;E\E\NE<CR>
The console sees the command line: EXAMINE<CR>
For video terminals, the previous character is erased and the
cursor is restored to its previous position.
The console does not delete characters past the beginning of a
command line. If you press more rubouts than there are characters
on the line, the extra rubouts are ignored. A rubout entered on a
blank line is ignored.
Ctrl/A
or
F14
Toggles insertion/overstrike mode for command line editing. By
default, the console powers up to overstrike mode.
Ctrl/C
Echoes ^C<CR> and aborts processing of a command. Has no effect
as part of a binary load data stream. Clears
Ctrl/S
and re-enables
output stopped by
Ctrl/O
.
Ctrl/D
or Moves the cursor one position to the left.
Ctrl/E
Moves the cursor to the end of the line.
Ctrl/F
or Moves the cursor one position to the right.
Ctrl/B
, , or Recalls the previous commands.
Ctrl/H
,
X
(rubout), or
F12
Deletes the previously typed character. Same function as
X
(rubout), above.
Ctrl/O
Ignores transmissions to the console until you enter
Ctrl/O
. Echoes
^O when disabling output, which is not echoed when it re-enables
output. Output is re-enabled if the console prints an error message,
or if it prompts for a command from the terminal. Output is also
enabled by entering Maintenance mode: press
Break
or enter
Ctrl/C
.
Ctrl/Q
Resumes output to the console terminal. Not echoed.
Base System Description 1–5