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at

- 
at -V (return code: 0)

at version 3.1.18
Please report bugs to the Debian bug tracking system (http://bugs.debian.org/)
or contact the maintainers (at@packages.debian.org).
at --help (return code: 1)

at: invalid option -- '-'
Usage: at [-V] [-q x] [-f file] [-mMlbv] timespec ...
       at [-V] [-q x] [-f file] [-mMlbv] -t time
       at -c job ...
       atq [-V] [-q x]
       at [ -rd ] job ...
       atrm [-V] job ...
       batch

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