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Each window in a
screen session emulates a VT100 terminal, with
some extra functions added. The commands described here modify the
screen. `(V)' and `(A)' indicate VT100-specific and ANSI- or ISO-specific functions, respectively.
ESC E Next Line ESC D Index ESC M Reverse Index ESC H Horizontal Tab Set ESC Z Send VT100 Identification String ESC 7 (V) Save Cursor and Attributes ESC 8 (V) Restore Cursor and Attributes ESC [s (A) Save Cursor and Attributes ESC [u (A) Restore Cursor and Attributes ESC c Reset to Initial State ESC = (V) Application Keypad Mode ESC > (V) Numeric Keypad Mode ESC # 8 (V) Fill Screen with E's ESC \ (A) String Terminator ESC ^ (A) Privacy Message String (Message Line) ESC ! Global Message String (Message Line) ESC k Title Definition String ESC P (A) Device Control String Outputs a string directly to the host terminal without interpretation. ESC _ (A) Application Program Command (not used) ESC ] (A) Operating System Command (not used) Control-N (A) Lock Shift G1 (SO) Control-O (A) Lock Shift G0 (SI) ESC n (A) Lock Shift G2 ESC o (A) Lock Shift G3 ESC N (A) Single Shift G2 ESC O (A) Single Shift G3 ESC ( Pcs (A) Designate character set as G0 ESC ) Pcs (A) Designate character set as G1 ESC * Pcs (A) Designate character set as G2 ESC + Pcs (A) Designate character set as G3 ESC [ Pn ; Pn H Direct Cursor Addressing ESC [ Pn ; Pn f Direct Cursor Addressing ESC [ Pn J Erase in Display Pn = None or 0 From Cursor to End of Screen 1 From Beginning of Screen to Cursor 2 Entire Screen ESC [ Pn K Erase in Line Pn = None or 0 From Cursor to End of Line 1 From Beginning of Line to Cursor 2 Entire Line ESC [ Pn A Cursor Up ESC [ Pn B Cursor Down ESC [ Pn C Cursor Right ESC [ Pn D Cursor Left ESC [ Ps ;...; Ps m Select Graphic Rendition Ps = None or 0 Default Rendition 1 Bold 2 (A) Faint 3 (A) Standout Mode (ANSI: Italicized) 4 Underlined 5 Blinking 7 Negative Image 22 (A) Normal Intensity 23 (A) Standout Mode off (ANSI: Italicized off) 24 (A) Not Underlined 25 (A) Not Blinking 27 (A) Positive Image ESC [ Pn g Tab Clear Pn = None or 0 Clear Tab at Current Position 3 Clear All Tabs ESC [ Pn ; Pn r (V) Set Scrolling Region ESC [ Pn I (A) Horizontal Tab ESC [ Pn Z (A) Backward Tab ESC [ Pn L (A) Insert Line ESC [ Pn M (A) Delete Line ESC [ Pn @ (A) Insert Character ESC [ Pn P (A) Delete Character ESC [ Ps ;...; Ps h Set Mode ESC [ Ps ;...; Ps l Reset Mode Ps = 4 (A) Insert Mode ?1 (V) Application Cursor Keys ?3 (V) Change Terminal Width to 132 columns ?5 (V) Visible Bell (`On' followed by `Off') ?6 (V) `Origin' Mode ?7 (V) `Wrap' Mode ESC [ 5 i (A) Start relay to printer (ANSI Media Copy) ESC [ 4 i (A) Stop relay to printer (ANSI Media Copy) ESC [ 8 ; Ph ; Pw t Resize the window to `Ph' lines and `Pw' columns (SunView special) ESC [ c Send VT100 Identification String ESC [ > c Send Secondary Device Attributes String ESC [ 6 n Send Cursor Position Report
screenhas to detect that a sequence of characters in the input stream was generated by a keypress on the user's keyboard and insert the VT100 style escape sequence.
Screenhas a very flexible way of doing this by making it possible to map arbitrary commands on arbitrary sequences of characters. For standard VT100 emulation the command will always insert a string in the input buffer of the window (see also command
stuff, see section Paste). Because the sequences generated by a keypress can change after a reattach from a different terminal type, it is possible to bind commands to the termcap name of the keys.
Screenwill insert the correct binding after each reattach. See section Bindkey for further details on the syntax and examples.
Here is the table of the default key bindings. (A) means that the command is executed if the keyboard is switched into application mode.
Key name Termcap name Command ----------------------------------------------------- Cursor up ku stuff \033[A stuff \033OA (A) Cursor down kd stuff \033[B stuff \033OB (A) Cursor right kr stuff \033[C stuff \033OC (A) Cursor left kl stuff \033[D stuff \033OD (A) Function key 0 k0 stuff \033[10~ Function key 1 k1 stuff \033OP Function key 2 k2 stuff \033OQ Function key 3 k3 stuff \033OR Function key 4 k4 stuff \033OS Function key 5 k5 stuff \033[15~ Function key 6 k6 stuff \033[17~ Function key 7 k7 stuff \033[18~ Function key 8 k8 stuff \033[19~ Function key 9 k9 stuff \033[20~ Function key 10 k; stuff \033[21~ Function key 11 F1 stuff \033[22~ Function key 12 F2 stuff \033[23~ Backspace kb stuff \010 Home kh stuff \033[1~ End kH stuff \033[4~ Insert kI stuff \033[2~ Delete kD stuff \033[3~ Page up kP stuff \033[5~ Page down kN stuff \033[6~ Keypad 0 f0 stuff 0 stuff \033Op (A) Keypad 1 f1 stuff 1 stuff \033Oq (A) Keypad 2 f2 stuff 2 stuff \033Or (A) Keypad 3 f3 stuff 3 stuff \033Os (A) Keypad 4 f4 stuff 4 stuff \033Ot (A) Keypad 5 f5 stuff 5 stuff \033Ou (A) Keypad 6 f6 stuff 6 stuff \033Ov (A) Keypad 7 f7 stuff 7 stuff \033Ow (A) Keypad 8 f8 stuff 8 stuff \033Ox (A) Keypad 9 f9 stuff 9 stuff \033Oy (A) Keypad + f+ stuff + stuff \033Ok (A) Keypad - f- stuff - stuff \033Om (A) Keypad * f* stuff * stuff \033Oj (A) Keypad / f/ stuff / stuff \033Oo (A) Keypad = fq stuff = stuff \033OX (A) Keypad . f. stuff . stuff \033On (A) Keypad , f, stuff , stuff \033Ol (A) Keypad enter fe stuff \015 stuff \033OM (A)
Command: bell_msg [message]
When a bell character is sent to a background window,
displays a notification in the message line. The notification message
can be re-defined by means of the
bell command. Each occurrence
of `%' in message is replaced by the number of the window to
which a bell has been sent, and each occurrence of `~' is replaced
by the definition for bell in your termcap (usually an audible bell).
The default message is
'Bell in window %'
An empty message can be supplied to the
bell_msg command to suppress
output of a message line (
Command: vbell [state]
Sets or toggles the visual bell setting for the current window. If
vbell is switched to `on', but your
terminal does not support a visual bell, the visual bell message is
displayed in the status line when the bell character is received.
Visual bell support of a terminal is
defined by the termcap variable
vb. See section `Visual Bell' in The Termcap Manual, for more information on visual bells.
The equivalent terminfo capability is
vbell is `off', thus the audible bell is used.
Command: vbell_msg [message]
Sets the visual bell message. message is printed to the status line if the window receives a bell character (^G),
set to `on' and the terminal does not support a visual bell.
The default message is `Wuff, Wuff!!'.
Without parameter, the current message is shown.
Command: vbellwait sec
Define a delay in seconds after each display of
screen 's visual
bell message. The default is 1 second.
Clears the screen and saves its contents to the scrollback buffer.
Set the display height to a specified number of lines. When no argument is given it toggles between 24 and 42 lines display.
(C-a i, C-a C-i)
Uses the message line to display some information about the current window: the cursor position in the form `(column,row)' starting with `(1,1)', the terminal width and height plus the size of the scrollback buffer in lines, like in `(80,24)+50', various flag settings (flow-control, insert mode, origin mode, wrap mode, application-keypad mode, output logging, activity monitoring, and redraw (`+' indicates enabled, `-' not)), the currently active character set (`G0', `G1', `G2', or `G3'), and in square brackets the terminal character sets that are currently designated as `G0' through `G3'. For system information use
Command: allpartial state
If set to on, only the current cursor line is refreshed on window change. This affects all windows and is useful for slow terminal lines. The previous setting of full/partial refresh for each window is restored with
allpartial off. This is a global flag that immediately takes effect
on all windows overriding the
partial settings. It does not change the
default redraw behaviour of newly created windows.
Command: partial state
Defines whether the display should be refreshed (as with
redisplay) after switching to the current window. This command
only affects the current window. To immediately affect all windows use the
allpartial command. Default is `off', of course. This default is
fixed, as there is currently no
(C-a l, C-a C-l)
Redisplay the current window. Needed to get a full redisplay in partial redraw mode.
Command: wrap state
(C-a r, C-a C-r)
Sets the line-wrap setting for the current window. When line-wrap is on, the second consecutive printable character output at the last column of a line will wrap to the start of the following line. As an added feature, backspace (^H) will also wrap through the left margin to the previous line. Default is `on'.
Command: defwrap state
Same as the
wrap command except that the default setting for new
windows is changed. Initially line-wrap is on and can be toggled with the
wrap command (C-a r) or by means of "C-a : wrap on|off".
Reset the virtual terminal to its "power-on" values. Useful when strange settings (like scroll regions or graphics character set) are left over from an application.
Toggle the window width between 80 and 132 columns, or set it to num columns if an argument is specified. This requires a capable terminal and the termcap entries `Z0' and `Z1'. See the
termcap command (see section Termcap), for more information.
Command: c1 [state]
Change c1 code processing. `c1 on' tells screen to treat the input characters between 128 and 159 as control functions. Such an 8-bit code is normally the same as ESC followed by the corresponding 7-bit code. The default setting is to process c1 codes and can be changed with the `defc1' command. Users with fonts that have usable characters in the c1 positions may want to turn this off.
Command: gr [state]
Turn GR charset switching on/off. Whenever screens sees an input char with an 8th bit set, it will use the charset stored in the GR slot and print the character with the 8th bit stripped. The default (see also `defgr') is not to process GR switching because otherwise the ISO88591 charset would not work.
Command: kanji wtype [dtype]
Tell screen how to process kanji input/output. wtype and dtype must be one of the strings `jis', `euc' or `sjis'. The first argument sets the kanji type of the current window. Each window can emulate a different type. The optional second parameter tells screen how to write the kanji codes to the connected terminal. The preferred method of setting the display type is to use the `KJ' termcap entry. See section Special Terminal Capabilities. See also `defkanji', which changes the default setting of a new window.
Command: defc1 state
Same as the `c1' command except that the default setting for new windows is changed. Initial setting is `on'.
Command: defgr state
Same as the `gr' command except that the default setting for new windows is changed. Initial setting is `off'.
Command: defkanji wtype
Same as the `kanji' command except that the default setting for new windows is changed. Initial setting is `off', i.e. `jis'.
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