I'm running a dual-screen setup and have my trackpad disabled most of the time (which includes hiding the mousepointer).When i reenable the trackpad (and display the mouse pointer again), i've lost track where the pointer was before.So i'm looking for a tool to highlight the current mouse position (e.g. by a circle). Ideally this would be a single command flashing the circle for a short period of time.I'm aware that xdotool can find the current position, yet there is no highlighting, also key-mon doesn't provide this functionaliy.I've also read that cairo composition manager provides such functionality, yet i'm wondering if there is a smaller tool to archive this. In case there is no such tool: What is the easiest way to display such a circle around the cursor using the data provided by xdotool getmouselocation?In case this is relevant: I don't use a desktop environment, just the  xmonad window manager.
Highlight current mouse position
x11;mouse
While I like Mikeserv's answer for cleverness, it has the downside that it will create a window which steals the focus and has to be clicked away. I also find it takes just slightly too long to start: about 0.2 to 0.3 seconds, which is just slightly too slow for a smooth experience.I finally got around to digging into XLib, and clobbered together a basic C program to do this. The visual effect is roughly similar to what Windows (XP) has (from memory). It's not very beautiful, but it works ;-) It doesn't steal focus, starts near-instantaneous, and you can click through it.You can compile it with cc find-cursor.c -o find-cursor -lX11 -lXext -lXfixes. There are some variables at the top you can tweak to change the size, speed, etc.I released this as a program at http://code.arp242.net/find-cursor. I recommend you use this version, as it has some improvements that the below script doesn't have (such as commandline arguments and ability to click through the window). I've left the below as-is due to its simplicity./* * http://code.arp242.net/find-cursor * Copyright  2015 Martin Tournoij <martin@arp242.net> * See below for full copyright */#include <stdlib.h>#include <stdio.h>#include <unistd.h>#include <string.h>#include <X11/Xlib.h>#include <X11/Xutil.h>// Some variables you can play with :-)int size = 220;int step = 40;int speed = 400;int line_width = 2;char color_name[] = black;int main(int argc, char* argv[]) {    // Setup display and such    char *display_name = getenv(DISPLAY);    if (!display_name) {        fprintf(stderr, %s: cannot connect to X server '%s'\n, argv[0], display_name);        exit(1);    }    Display *display = XOpenDisplay(display_name);    int screen = DefaultScreen(display);    // Get the mouse cursor position    int win_x, win_y, root_x, root_y = 0;    unsigned int mask = 0;    Window child_win, root_win;    XQueryPointer(display, XRootWindow(display, screen),        &child_win, &root_win,        &root_x, &root_y, &win_x, &win_y, &mask);    // Create a window at the mouse position    XSetWindowAttributes window_attr;    window_attr.override_redirect = 1;    Window window = XCreateWindow(display, XRootWindow(display, screen),        root_x - size/2, root_y - size/2,   // x, y position        size, size,                         // width, height        0,                                  // border width        DefaultDepth(display, screen),      // depth        CopyFromParent,                     // class        DefaultVisual(display, screen),     // visual        CWOverrideRedirect,                 // valuemask        &window_attr                        // attributes    );    XMapWindow(display, window);    XStoreName(display, window, find-cursor);    XClassHint *class = XAllocClassHint();    class->res_name = find-cursor;    class->res_class = find-cursor;    XSetClassHint(display, window, class);    XFree(class);    // Keep the window on top    XEvent e;    memset(&e, 0, sizeof(e));    e.xclient.type = ClientMessage;    e.xclient.message_type = XInternAtom(display, _NET_WM_STATE, False);    e.xclient.display = display;    e.xclient.window = window;    e.xclient.format = 32;    e.xclient.data.l[0] = 1;    e.xclient.data.l[1] = XInternAtom(display, _NET_WM_STATE_STAYS_ON_TOP, False);    XSendEvent(display, XRootWindow(display, screen), False, SubstructureRedirectMask, &e);    XRaiseWindow(display, window);    XFlush(display);    // Prepare to draw on this window    XGCValues values = { .graphics_exposures = False };    unsigned long valuemask = 0;    GC gc = XCreateGC(display, window, valuemask, &values);    Colormap colormap = DefaultColormap(display, screen);    XColor color;    XAllocNamedColor(display, colormap, color_name, &color, &color);    XSetForeground(display, gc, color.pixel);    XSetLineAttributes(display, gc, line_width, LineSolid, CapButt, JoinBevel);    // Draw the circles    for (int i=1; i<=size; i+=step) {         XDrawArc(display, window, gc,            size/2 - i/2, size/2 - i/2,   // x, y position            i, i,                         // Size            0, 360 * 64);                 // Make it a full circle        XSync(display, False);        usleep(speed * 100);    }    XFreeGC(display, gc);    XCloseDisplay(display);}/* *  The MIT License (MIT) *  *  Copyright  2015 Martin Tournoij *  *  Permission is hereby granted, free of charge, to any person obtaining a copy *  of this software and associated documentation files (the Software), to *  deal in the Software without restriction, including without limitation the *  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or *  sell copies of the Software, and to permit persons to whom the Software is *  furnished to do so, subject to the following conditions: *  *  The above copyright notice and this permission notice shall be included in *  all copies or substantial portions of the Software. *  *  The software is provided as is, without warranty of any kind, express or *  implied, including but not limited to the warranties of merchantability, *  fitness for a particular purpose and noninfringement. In no event shall the *  authors or copyright holders be liable for any claim, damages or other *  liability, whether in an action of contract, tort or otherwise, arising *  from, out of or in connection with the software or the use or other dealings *  in the software. */