XClock

xclock is a lightweight clock utility for the X Window System. It displays the current time in a dedicated window and can render the time as a digital readout or an analog clock. The program is designed to be simple and unobtrusive, serving as a convenient on-screen time reference for X11 environments.

xclock supports a range of command-line options and resource settings. It can run in digital or analog mode, controlled by options such as -digital or -analog. The update interval can be set with -update (in seconds). Appearance is configurable with -fg and -bg for foreground and background colors, -fn to select the font, and -geometry to position and size the window.

Origin and availability: xclock has long been distributed with the standard X Window System toolset and remains common on Unix-like systems with X11 dependencies. It is typically installed as part of the x11-utils or xclock package and can be launched from a graphical session or a script to provide a lightweight clock display. As a simple example of X11 applications, it is often used in demonstrations and educational settings.