1.\" 2.\" $FreeBSD: src/share/man/man4/screen.4,v 1.14.2.9 2001/08/17 13:08:39 ru Exp $ 3.\" 4.Dd October 6, 2000 5.Dt SCREEN 4 6.Os 7.Sh NAME 8.Nm screen 9.Nd pc display interface 10.Sh DESCRIPTION 11Access to the 12.Em virtual consoles 13are obtained through the device files 14.Pa /dev/ttyv0 15- 16.Pa /dev/ttyvb . 17Each of these files correspond to a separate 18virtual console. 19All virtual console devices can be open at once, but only one is 20active at a time. 21The active virtual console "owns" the keyboard and 22display screen. 23.Pp 24Output to a virtual console that not currently is on the display is 25saved in a buffer that holds a "screenfull" (normally 25) lines. 26Any output written to 27.Pa /dev/console 28(the original console device) is echoed to 29.Pa /dev/ttyv0 . 30.Pp 31To switch between the virtual consoles one uses the sequence 32.Em ALT+Fn , 33which means hold down ALT and press one of the function keys. 34The 35virtual console with the same number as the function key is then 36selected as the current virtual console, and given exclusive use of 37the keyboard and display. 38This switch sequence can be changed via 39the keyboard mapping ioctl call (see 40.Xr keyboard 4 ) . 41.Pp 42The console allows entering values that are not physically 43present on the keyboard via a special keysequence. 44To use this facility press and hold down ALT, 45then enter a decimal number from 0-255 via the numerical keypad, then 46release ALT. 47The entered value is then used as the ASCII value for one 48character. 49This way it is possible to enter any ASCII value. 50The console driver also includes a history function. 51It is activated by 52pressing the scroll-lock key. 53This holds the display, and enables the cursor 54arrows for scrolling up and down through the last scrolled out lines. 55.Pp 56The console understands a subset of the ANSI x3.64 character 57sequences. 58For compatibility with the old pccons, the PC3 character 59sequences is also supported. 60.Bd -literal 61ANSI Seq Function Termcap entry 62======= ======= ===================================== ============== 63 64-- E7 Save cursor position sc 65 66-- E8 Restore saved cursor position rc 67 68-- Ec Reset rs 69 70-- EM move cursor up 1 line, -- 71 scroll if at top 72 73CUU E[nA move cursor up n lines up/UP (ku) 74 75CUD E[nB move cursor down n lines do/DO (kd) 76 77CUF E[nC move cursor right n characters nd/RI (kr) 78 79CUB E[nD move cursor left n characters --/LE (kl) 80 81HPA E[n` move cursor to character position n ch 82 83HPR E[na move cursor right n characters -- 84 85VPA E[nd move cursor to line n cv 86 87VPR E[ne move cursor down n lines -- 88 89CPL E[nF move cursor to start of line, -- (@7) 90 n lines up 91 92CNL E[nE move cursor to start of line, nw 93 n lines down 94 95CUP E[y;xH Move cursor to x, y cm 96 97HVP E[y;xf Move cursor to x, y -- 98 99CBT E[nZ Move cursor back n tab stops bt (kB) 100 101IL E[nL Insert n blank lines al/AL 102 103ICH E[n@ Insert n blank characters ic/IC 104 105DL E[nM Delete n lines dl/DL 106 107DCH E[nP Delete n characters dc/DC 108 109ED E[nJ Erase part or all of display: cd 110 n=0 from cursor to end of display, 111 n=1 from begin of display to cursor, 112 n=2 entire display. 113 114EL E[nK Erase part or all of line: ce 115 n=0 from cursor to end of line, 116 n=1 from begin of line to cursor, 117 n=2 entire line. 118 119ECH E[nX Erase n characters ec 120 121SU E[nS Scroll display n lines up (forward) sf/SF 122 123SD E[nT Scroll display n lines down (reverse) sr/SR 124 125 126SGR E[nm Set character attributes: -- 127 n= 0 normal attribute (all off) 128 n= 1 bold (highlight) 129 n= 4 underscore (if supported by HW) 130 n= 5 blink (if supported by HW) 131 n= 7 reverse 132 n= 22 remove bold 133 n= 24 remove underscore 134 n= 25 remove blink 135 n= 27 remove reverse 136 n= 3X set ANSI foreground color 137 (see table) 138 n= 4X set ANSI background color 139 (see table) 140 141 X=0 black X=1 red 142 X=2 green X=3 brown 143 X=4 blue X=5 magenta 144 X=6 cyan X=7 light grey 145 X=9 reset to the normal color 146 147-- E[s Save cursor position sc 148 149-- E[u Restore saved cursor position rc 150 151-- E[x Reset normal colors and attributes -- 152 to their default values 153 154-- E[nz Switch to virtual console n -- 155 156-- E[1;nx Set normal ANSI background color -- 157 to n (see table) 158 159-- E[2;nx Set normal ANSI foreground color -- 160 to n (see table) 161 162-- E[3;nx Set normal video attribute directly -- 163 to n (n from 0 to 255) 164 165-- E[5;nx Set normal ANSI reverse background -- 166 color to n (see table) 167 168-- E[6;nx Set normal ANSI reverse foreground -- 169 color to n (see table) 170 171 n= 0 black n= 8 dark grey 172 n= 1 red n= 9 light red 173 n= 2 green n=10 light green 174 n= 3 brown n=11 yellow 175 n= 4 blue n=12 light blue 176 n= 5 magenta n=13 light magenta 177 n= 6 cyan n=14 light cyan 178 n= 7 light grey n=15 white 179 180-- E[7;nx Set normal reverse video attribute -- 181 directly to n (n from 0 to 255) 182 183-- E[=p;dB Set bell pitch (p) and duration (d), -- 184 pitch is in units of 840 nS, 185 duration is units of 0,1 S. 186 187-- E[=tC Set cursor type (see table) -- 188 189 t=0 normal non-blinking 190 t=1 normal blinking 191 t=2 custom non-blinking 192 t=3 custom blinking 193 194-- E[=s;eC Set custom cursor shape, where -- 195 s is the starting and e is the ending 196 scanlines of the cursor. 197 198-- E[=nA Set the border color to n -- 199 (see table) (if supported by HW) 200 201-- E[=nF Set normal foreground color to n -- 202 (see table) 203 204-- E[=nG Set normal background color to n -- 205 (see table) 206 207-- E[=nH Set normal reverse foreground color -- 208 to n (see table) 209 210-- E[=nI Set normal reverse background color -- 211 to n (see table) 212 213 n= 0 black n= 8 dark grey 214 n= 1 blue n= 9 light blue 215 n= 2 green n=10 light green 216 n= 3 cyan n=11 light cyan 217 n= 4 red n=12 light red 218 n= 5 magenta n=13 light magenta 219 n= 6 brown n=14 yellow 220 n= 7 light grey n=15 white 221 222note: the first E in the sequences stands for ESC (0x1b) 223.Ed 224.Sh AUTHORS 225.An S\(/oren Schmidt Aq Mt sos@FreeBSD.org 226