z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

cron daemon
Files
If these files do not exist, only the superuser can use the at command. To allow all
users access to at, there must be a null at.deny file and no at.allow file.
cron uses the files cron.allow and cron.deny in a similar manner.
v cron.allow contains the list of users who have permission to use crontab.
v cron.deny contains the list of users who do not have permission to use crontab.
If these files do not exist, only the superuser can use crontab. To allow all users
access to crontab, there must be a null cron.deny file and no cron.allow file.
cron uses the following files which reside in a system-defined directory:
/etc/mailx.rc
Although cron does not use this file directly, cron may call mailx which
uses this file for configuration settings. Specifically, for cron to deliver
messages properly, this file should contain a valid setting for the mailx
sendmail variable. This file is generally copied from /samples/mailx.rc.
/usr/spool/cron
The main cron directory.
Related Information
at, crontab, mailx
/usr/spool/cron/atjobs
A directory containing at files.
/usr/spool/cron/crontabs
A directory containing crontab files.
/usr/spool/cron/log
A file that maintains a history of the commands being run. The systems
administrator should truncate this file periodically.
/usr/spool/cron/pid
A file that cron uses to ensure that only one version of cron is currently
running on the system. This file must be unique per system which is
particularly important when you are setting up a sysplex. For more
information about customizing cron when setting up a sysplex see
″Customizing cron, uucp, and mail Utilities for a Read-Only root file system″
and ″Customizing the cron and uucp Utilities″ in z/OS UNIX System
Services Planning.
/usr/lib/cron/at.allow
Contains a list of the users who can use the at command (one per line).
/usr/lib/cron/at.deny
Contains a list of the users who cannot use the at command (one per line).
/usr/lib/cron/cron.allow
Contains a list of the users who can use the crontab command (one per
line).
/usr/lib/cron/cron.deny
Contains a list of the users who cannot use the crontab command (one per
line).
/usr/lib/cron/queuedefs
The queue description file (see the description of queuedefs in 921).
170 z/OS V1R9.0 UNIX System Services Command Reference