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.
calendar -V (return code: 1)
calendar: Operation not permitted
calendar -h (return code: 1)
calendar: invalid option -- 'h'
usage: calendar [-ab] [-A num] [-B num] [-l num] [-w num][-f calendarfile] [-t [[[cc]yy][mm]]dd]