xmessage - display a message or query in a window (X-based /bin/echo)
xmessage [ -buttons
  label1[:value1],label2[:value2], ... ] [
  options ] -file filename
xmessage [ -buttons
  label1[:value1],label2[:value2], ... ] [
  options ] message ...
The xmessage program displays a window containing a message from the
  command line, a file, or standard input. Along the lower edge of the message
  is row of buttons; clicking the left mouse button on any of these buttons will
  cause xmessage to exit. Which button was pressed is returned in the
  exit status and, optionally, by writing the label of the button to standard
  output.
The program is typically used by shell scripts to display
    information to the user or to ask the user to make a choice.
Unless a size is specified, xmessage sizes itself to fit
    the message, up to a maximum size. If the message is too big for the window,
    xmessage will display scroll bars.
These are the command line options that xmessage understands, in addition
  to the standard ones listed in X(7).
  - -buttons button,button,...
- This option will cause xmessage to create one button for each
      comma-separated button argument. The corresponding resource is
      buttons. Each button consists of a label optionally followed
      by a colon and an exit value. The label is the name of the Command button
      widget created and will be the default text displayed to the user. Since
      this is the name of the widget it may be used to change any of the
      resources associated with that button. The exit value will be returned by
      xmessage if that button is selected. The default exit value is 100
      plus the button number. Buttons are numbered from the left starting with
      one. The default string if no -buttons option is given is
      okay:0.
- -default label
- Defines the button with a matching label to be the default. If not
      specified there is no default. The corresponding resource is
      defaultButton. Pressing Return anywhere in the xmessage
      window will activate the default button. The default button has a wider
      border than the others.
- -file filename
- File to display. The corresponding resource is file. A
      filename of `-' reads from standard input. If this option is
      not supplied, xmessage will display all non-option arguments in the
      style of echo. Either -file or a message on the command line
      should be provided, but not both.
- -print
- This will cause the program to write the label of the button pressed to
      standard output. Equivalent to setting the printValue resource to
      TRUE. This is one way to get feedback as to which button was pressed.
- -center
- Pop up the window at the center of the screen. Equivalent to setting the
      center resource to TRUE.
- -nearmouse
- Pop up the window near the mouse cursor. Equivalent to setting the
      nearMouse resource to TRUE.
- -timeout secs
- Exit with status 0 after secs seconds if the user has not clicked
      on a button yet. The corresponding resource is timeout.
Knowing the name and position in the hierarchy of each widget is useful when
  specifying resources for them. In the following chart, the class and name of
  each widget is given.
Xmessage (xmessage)
	Form form
		Text message
		Command (label1)
		Command (label2)
		.
		.
		.
The program has a few top-level application resources that allow customizations
  that are specific to xmessage.
  - file
- A String specifying the file to display.
- buttons
- A String specifying the buttons to display. See the -buttons
      command-line option.
- defaultButton
- A String specifying a default button by label.
- printValue
- A Boolean value specifying whether the label of the button pressed to exit
      the program is written to standard output. The default is FALSE.
- center
- A Boolean value specifying whether to pop up the window at the center of
      the screen. The default is FALSE.
- nearMouse
- A Boolean value specifying whether to pop up the window near the mouse
      cursor. The default is FALSE.
- timeout
- The number of seconds after which to exit with status 0. The default is 0,
      which means never time out.
- maxHeight (class Maximum)
- The maximum height of the text part of the window in pixels, used if no
      size was specified in the geometry. The default is 0, which means use 70%
      of the height of the screen.
- maxWidth (class Maximum)
- The maximum width of the text part of the window in pixels, used if no
      size was specified in the geometry. The default is 0, which means use 70%
      of the width of the screen.
  - exit(value)
- exit immediately with an exit status of value (default 0). This
      action can be used with translations to provide alternate ways of exiting
      xmessage.
- default-exit()
- exit immediately with the exit status specified by the default button. If
      there is no default button, this action has no effect.
If it detects an error, xmessage returns 1, so this value should not be
  used with a button.
Chris Peterson, MIT Project Athena
Stephen Gildea, X Consortium