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This is version of 3.1.x of the at/atrun pair for running commands at a
specified time. To install, do a
$ ./configure
You might want to change the default maximum load at which batch
jobs are still started by specifying --with-loadavg_mx=... as
argument to configure. The default is 0.8, so that, normally, no
batch job will be started when there's still activity going on.
For an SMP system, you will want to increase this.
Then, do
$ make
and, as root,
# make install
There are two ways of running at jobs.
The new one is to start up an atd daemon at boot time.
The old one is to put
* * * * 0,5,10,15,20,25,30,35,40,45,50,55 /usr/lib/atrun
into root's crontab file (or wherever you put the atrun binary;
don't forget to start up cron.)
(To place the line into crontab, do a
# crontab -l > cront
# vi cront
[or whatever your favourite editor is. Add the line above if it is
not already in there.]
# crontab -r cront
)
The new way has advantages on portable systems (where it doesn't wake up
the disk every five minutes or so), and it also does immediate execution
of batch jobs. The old way is compatible with the setup that's being
shipped with most Linux distributions, and doesn't have an extra process
hanging around all the time.
If you happen to have an older version of at around, make sure to delete
it (it might lurk in /bin, for example).
Bug reports to:
ig25@rz.uni-karlsruhe.de
If at all possible, I'd appreciate you telling me which version you
found a bug in; run at -V to find out which one.
If you try to use at(1) on a system which does not support setreuid(2),
i.e. if you get an error whch looks vaguely like
undefined symbol _setreuid referenced from text segment
DO NOT try to install at on your system by removing all that strange
PRIV stuff. You will install a rather glaring security hole that way.
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