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The at(1) code is now more tightly integrated into the cron codebase.
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long-standing annoyance that atrun's granularity is 10 minutes.
Most at jobs run with a 1 minute granularity. Jobs submitted via
"at now" or "batch" will run immediately. Includes a rewritten
cron(8) man page. at(1) will be integrated more closely into
cron at a future date.
Upgrading notes:
the atrun job in root's crontab should be removed.
the /var/at/spool directory is no longer used
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Job names are now "runtime.queue" where runtime is when the job will run
in Unix time format. This is what SysV at does and allows us to nuke
the .SEQ file.
Historic BSD options for atq and atrm are now implemented;
atq and atrm get their own man pages.
At no longer does anything with the -v flag. We print the execution
time when jobs are submitted so there is no need.
Most *scanf() usage is gone (one remains in atrun).
Better sanity checks in atrun.
Random style/cleanup.
With these changes we have the best of both worlds; POSIX compliance with
the traditional BSD features.
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This means that /var/at/at.{allow,deny} must be readable by group
crontab, /var/at/jobs is mode 01770, and /var/at/.SEQ is mode 0660.
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