![]() ![]() (The “TERMCAP” environment variable is not set if xterm is linked against a terminfo library, since the requisite information is not provided by the termcap emulation of terminfo libraries). On most systems, xterm will use the terminfo database. You may also use descriptions corresponding to the various supported emulations such as “vt220” or “vt420”, but should set the terminal emulation level with the decTerminalID resource. Xterm wraps text at the right margin using the VT100 “newline glitch” behavior.īecause of the wrapping behavior, you would occasionally have to repaint the screen when using a text editor with the “ansi” description. Pseudo-graphics (line-drawing) uses a different mapping. These features differ in an “ansi” terminal description from xterm: acsc For instance, they use different controls for scrolling (but xterm supports both). Similarly, “ansi” and “vt100” are often equated. The VT102 provided controls for inserting and deleting lines. VT100 and VT102 emulations are commonly equated, though they actually differ. The alternatives after “xterm” are very old, from the late 1980s. Xterm automatically searches the terminal database in this order for these entries and then sets the “TERM” variable (and the “TERMCAP” environment variable on a few older systems). Terminal database ( terminfo (5) or termcap (5)) entries that work with xterm includeĪn optional platform-specific entry (“xterm”), Xterm does not support some other features which are not suitable for emulation, e.g., two-sessions. VT420 emulation (the default) supports controls for manipulating rectangles of characters as well as left/right margins. VT220 emulation does not support soft fonts, it is otherwise complete.VT102 emulation is fairly complete, but does not support autorepeat (because that would affect the keyboard used by other X clients).ĭouble-size characters are displayed properly if your font server supports scalable bitmap fonts. Xterm provides usable emulations of related DEC terminals: The active window can be chosen through escape sequences, the VT Options menu in the VT xxx window, and the Tek Options menu in the 4014 window. This is the window that contains the text cursor. This box is located in the upper left area of the window.Īlthough both windows may be displayed at the same time, one of them is considered the “active” window for receiving keyboard input and terminal output. To maintain the correct aspect ratio (height/width), Tektronix graphics will be restricted to the largest box with a 4014's aspect ratio that will fit in the window. The VT xxx and Tektronix 4014 terminals each have their own window so that you can edit text in one and look at graphics in the other at the same time. If the underlying operating system supports terminal resizing capabilities (for example, the SIGWINCH signal in systems derived from 4.3BSD), xterm will use the facilities to notify programs running in the window whenever it is resized. It also provides Tektronix 4014 emulation for programs that cannot use the window system directly. ![]() It provides DEC VT102/VT220 and selected features from higher-level terminals such as VT320/VT420/VT520 (VT xxx). ![]() The xterm program is a terminal emulator for the X Window System.
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