1.\" 2.\" $FreeBSD$ 3.\" 4.Dd January 8, 1995 5.Dt SCREEN 4 6.Os FreeBSD 7.Sh NAME 8.Nm screen 9.Nd pc display interface 10.Sh DESCRIPTION 11 12Access to the 13.Ar virtual consoles 14are obtained through the device files 15ttyv0 - ttyvb in 16.Pa /dev . 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.Ar ALT+Fn 33, which 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 keyboard.4) 40.Pp 41 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 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.Pp 61.Bd -literal 62ANSI Seq Function Termcap entry 63======= ======= ===================================== ============== 64 65-- E7 Save cursor position sc 66 67-- E8 Restore saved cursor position rc 68 69CUU E[nA move cursor up n lines up/UP (ku) 70 71CUD E[nB move cursor down n lines do/DO (kd) 72 73CUF E[nC move cursor right n characters nd/RI (kr) 74 75CUB E[nD move cursor left n characters --/LE (kl) 76 77HPA E[n` move cursor to character position n ch 78 79HPR E[na move cursor right n characters -- 80 81VPA E[nd move cursor to line n cv 82 83VPR E[ne move cursor down n lines -- 84 85CPL E[nF move cursor to start of line, -- (@7) 86 n lines up 87 88CNL E[nE move cursor to start of line, nw 89 n lines down 90 91CUP E[y;xH Move cursor to x, y cm 92 93HVP E[y;xf Move cursor to x, y -- 94 95CBT E[nZ Move cursor back n tab stops bt (kB) 96 97IL E[nL Insert n blank lines al/AL 98 99ICH E[n@ Insert n blank characters ic/IC 100 101DL E[nM Delete n lines dl/DL 102 103DCH E[nP Delete n characters dc/DC 104 105ED E[nJ Erase part or all of display: cd 106 n=0 from cursor to end of display, 107 n=1 from begin of display to cursor, 108 n=2 entire display. 109 110EL E[nK Erase part or all of line: ce 111 n=0 from cursor to end of line, 112 n=1 from begin of line to cursor, 113 n=2 entire line. 114 115ECH E[nX Erase n characters ec 116 117SU E[nS Scroll display n lines up (forward) sf/SF 118 119SD E[nT Scroll display n lines down (reverse) sr/SR 120 121 122SGR E[nm Set character attributes: -- 123 n= 0 normal attribute (all off) 124 n= 1 bold (highlight) 125 n= 4 underscore (if supported by HW) 126 n= 5 blink (if supported by HW) 127 n= 7 reverse 128 n=3X set foreground color (see table) 129 n=4X set background color (see table) 130 131 X=0 black X=1 red 132 X=2 green X=3 brown 133 X=4 blue X=5 magenta 134 X=6 cyan X=7 white 135 136-- E[s Save cursor position sc 137 138-- E[u Restore saved cursor position rc 139 140-- E[=p;dB Set bell pitch (p) and duration (d), -- 141 picth is in units of 840 nS, 142 duration is units of 0,1 S. 143 144-- E[=tC Set cursor type, 1 selects a blinking -- 145 cursor, 0 a steady cursor. 146 147-- E[=nA Set the border color to color n 148 (see table) (if supported by HW) 149 150-- E[=nF set normal foreground color to n -- 151 (see table) 152 153-- E[=nG set normal background color to n -- 154 (see table) 155 156-- E[=nH set reverse foreground color to n -- 157 (see table) 158 159-- E[=nI set reverse background color to n -- 160 (see table) 161 162 n= 0 black n= 8 grey 163 n= 1 blue n= 9 light blue 164 n= 2 green n=10 light green 165 n= 3 cyan n=11 light cyan 166 n= 4 red n=12 light red 167 n= 5 magenta n=13 light magenta 168 n= 6 brown n=14 yellow 169 n= 7 white n=15 light white 170 171note: the first E in the sequences stands for ESC (0x1b) 172 173.Ed 174.Pp 175.Sh AUTHORS 176.An S�ren Schmidt Aq sos@FreeBSD.org 177