Note: help and version output are generated by a naïve script which tries a few variants of
<command> --help, <command> -h etc. to find the command's help and version info.
Sometimes it gets lucky, sometimes it doesn't; if the output below looks wrong, it probably is.
xlsclients -version (return code: 0)
xlsclients 1.1.3
xlsclients --help (return code: 1)
usage: xlsclients [-display dpy] [-m len] [-[a][l]] [-version]