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Xterm
xterm is the standard terminal emulator for the X Window System. It is highly configurable and has many useful and some unusual features.
The ultimate authorities for using and customizing xterm are the man pages for xterm, uxterm, koi8rxterm, and resize; and the XTerm ChangeLog.
Basics
Xterm is used with different hardware on a variety of operating systems, not just with a PC keyboard on a GNU/Linux system. There are several options you can set in your X resources files that may make this terminal emulator much easier to use.
- Allow xterm to report the TERM variable correctly. Do not set the TERM variable from your ~/.bashrc or ~/.bash_profile or similar file. The terminal itself should report the correct TERM to the system so that the proper terminfo file will be used. Two usable terminfo files are xterm, and xterm-256color.
- – Without setting TERM explicitly, xterm should report
$TERM
asxterm
. You can check this from within xterm using either of these commands:
$ echo $TERM $ tset -q
- – When TERM is not set explicitly, color schemes for some programs, such as vim, may not appear until a key is pressed or some other input occurs. This can be remedied by setting the resource
termName
, either from the command line withxterm -tn xterm-256color
, or by setting the resource value:
xterm*termName: xterm-256color
- Use UTF-8. First make certain your locale settings are correct for UTF-8, then add this to your resource file so that xterm interprets all incoming data as UTF-8 encoded:
XTerm*locale: true
- Fix the Alt key. Template:Keypress is not the Template:Keypress key, yet on PC keyboards Template:Keypress is used as the Template:Keypress key. Make xterm aware of this by adding the following to your resource file:
XTerm*metaSendsEscape: true
Scrolling
As new lines are written to the bottom of the xterm window, older lines disappear from the top. Xterm saves these lines and they can be redisplayed by scrolling. By default, 1024 lines are saved. You can change the number of saved lines with the saveLines
resource,
Xterm*saveLines: 4096
Other X resources that affect scrolling are jumpScroll
, set to true
by default, and multiScroll
and fastScroll
, both of which default to false
.
For manual scrolling, one can use the mouse wheel, or the key combinations of Template:Keypress and Template:Keypress to scroll a half page at a time, or one can use the scrollbar.
The Scrollbar
The scrollbar is not shown by default. It can be made visible by a menu selection, by command line options, or by setting resource values. It can be made to appear to the left or right of the window and its visual appearance can be modified through resource settings.
The scrollbar operates differently from what you may be accustomed to using.
- To scroll down:
- – Click on the scrollbar with the left mouse button.
- – Click on the scrollbar below the thumb with the middle mouse button.
- To scroll up:
- – Click on the scrollbar with the right mouse button.
- – Click on the scrollbar above the thumb with the middle mouse button.
- To position text, moving in either direction:
- – Grab the thumb and use "click-and-drag" with the middle mouse button.
Menus
The Archlinux version of xterm is compiled with the toolbar, or menubar, disabled. The menus are still available as popups when you press Template:Keypress within the xterm window. The actions invoked by the menu items can often be accomplished using command line options or by setting resource values.
xterm*geometry: 80x32
, in your resources file. This does start xterm in an 80 column by 32 row main window, but it also forces the menu windows to be 80 pixels by 32 pixels! Replace the incorrect line with this:
xterm*VT100.geometry: 80x32
Some of the menu options are discussed below.
Main Options Menu
Ctrl + LeftMouse
Secure Keyboard
attempts to ensure only the xterm window, and no other application, receives your keystrokes. The display changes to reverse video when it is invoked. If the display is not in reverse video, the Secure Keyboard mode is not in effect. Please read the "SECURITY" section of the xterm man page for this option's limitations.
Allow SendEvents
allows other processes to send keypress and mouse events to the xterm instance. Because of the security risk, do not enable this unless you are very sure you know what you are doing.
Log to File
– The log file will be namedXterm.log.hostname.yyyy.mm.dd.hh.mm.ss.XXXXXX
. This file will contain all the printed output and also all cursor movements. Logging may be a security risk.
- The six
Send *** Signal
menu items are not often useful, except when your keyboard fails.HUP
,TERM
andKILL
will close the xterm window.KILL
should be avoided, as it does not allow any cleanup code to run.
- The
Quit
menu item will also close the xterm window – it is the same as sending aHUP
signal. Most users will use the keyboard combination Template:Keypress or will typeexit
to close an xterm instance.
VT Options Menu
Ctrl + MiddleMouse
Select to Clipboard
– Normally, selected text is stored in PRIMARY, to be pasted with Template:Keypress or by using the middle mouse button. By toggling this option to on, selected text will use CLIPBOARD, allowing you to paste the text selected in an xterm window into a GUI application using Template:Keypress. The corresponding XTerm resource isselectToClipboard
.
Show Alternate Screen
– When you use an a terminal application such as vim, or less, the alternate screen is opened. The main VT window, now hidden, remains in memory. You can view this main window, but not issue any commands in it, by using this menu option. You are able to select and copy text from this main window (when using vim, hold down Template:Keypress while using the mouse) to paste into your editor in the alternate screen. Using the alternate screen may take some trial and error experimentation.
Show Tek Window
andSwitch to Tek Mode
–