Scheduling subsystems (crontab, at) and the desktop

Mårten Svantesson f95-msv at
Fri Jul 23 17:29:53 EEST 2004

Philip Van Hoof <spamfrommailing at> writes:

> While implementing this userinterface, we came across several
> incompatibilities between different versions and implementations of
> crontab and incompatibilities between different versions of at.
> This makes it very very hard to implement a GUI for such systems.
> At will prepend a bunch of environment variables to your scripts. Which
> ones differs between distributions, users and the stack of environment
> variables which you have set.
> Crontab has different implementations (dcron, Vixies crontab) which
> might or might not have the same commandline options and behaviours.
> I feel that is the place to be to get a specification
> for these subsystems published.
> What do you people think?

Are the current standards concerning at and crontab lacking? For
example the latest UNIX specification: 

The Open Group Base Specifications Issue 6

In part XCU at and crontab are specified:

                - Mårten
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