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PERIODIC(8)               BSD System Manager's Manual              PERIODIC(8)

NAME
     periodic -- run periodic system functions

SYNOPSIS
     periodic directory ...

DESCRIPTION
     The periodic utility is intended to be called by launchd(8) to execute shell scripts located in the
     specified directory.

     One or more of the following arguments must be specified:

     daily    Perform the standard daily periodic executable run.  This usually occurs early in the morning
              (local time).

     weekly   Perform the standard weekly periodic executable run.  This usually occurs very early on Satur-day Saturday
              day mornings.

     monthly  Perform the standard monthly periodic executable run.  This usually occurs on the first day of
              the month.

     path     An arbitrary directory containing a set of executables to be run.

     If an argument is an absolute directory name it is used as is, otherwise it is searched for under
     /etc/periodic and any other directories specified by the local_periodic setting in periodic.conf(5)
     (see below).

     The periodic utility will run each executable file in the directory or directories specified.  If a
     file does not have the executable bit set, it is silently ignored.

     Each script is required to exit with one of the following values:

     0     The script has produced nothing notable in its output.  The <basedir>_show_success variable con-trols controls
           trols the masking of this output.

     1     The script has produced some notable information in its output.  The <basedir>_show_info variable
           controls the masking of this output.

     2     The script has produced some warnings due to invalid configuration settings.  The
           <basedir>_show_badconfig variable controls the masking of this output.

     >2    The script has produced output that must not be masked.

     If the relevant variable (where <basedir> is the base directory in which the script resides) is set to
     ``NO'' in periodic.conf, periodic will mask the script output.  If the variable is not set to either
     ``YES'' or ``NO'', it will be given a default value as described in periodic.conf(5).

     All remaining script output is delivered based on the value of the <basedir>_output setting.

     If this is set to a path name (beginning with a `/' character), output is simply logged to that file.
     newsyslog(8) knows about the files /var/log/daily.log, /var/log/weekly.log and /var/log/monthly.log,
     and if they exist, it will rotate them at the appropriate times.  These are therefore good values if
     you wish to log periodic output.

     If the <basedir>_output value does not begin with a `/' and is not empty, it is assumed to contain a
     list of email addresses, and the output is mailed to them.  If <basedir>_show_empty_output is set to
     ``NO'', then no mail will be sent if the output was empty.

     If <basedir>_output is not set or is empty, output is sent to standard output.

ENVIRONMENT
     The periodic utility sets the PATH environment to include all standard system directories, but no addi-tional additional
     tional directories, such as /usr/local/bin.  If executables are added which depend upon other path com-ponents, components,
     ponents, each executable must be responsible for configuring its own appropriate environment.

FILES
     /System/Library/LaunchDaemons/com.apple.periodic-*.plist
                                  the periodic utility is typically called via these launchd(8) jobs

     /etc/periodic                the top level directory containing daily, weekly, and monthly subdirecto-ries subdirectories
                                  ries which contain standard system periodic executables

     /etc/defaults/periodic.conf  the periodic.conf system registry contains variables that control the be-haviour behaviour
                                  haviour of periodic and the standard daily, weekly, and monthly scripts

     /etc/periodic.conf           this file contains local overrides for the default periodic configuration

EXIT STATUS
     Exit status is 0 on success and 1 if the command fails.

EXAMPLES
     The /etc/defaults/periodic.conf system registry will typically have a local_periodic variable reading:

           local_periodic="/usr/local/etc/periodic"

     To log periodic output instead of receiving it as email, add the following lines to /etc/periodic.conf:

           daily_output=/var/log/daily.log
           weekly_output=/var/log/weekly.log
           monthly_output=/var/log/monthly.log

     To only see important information from daily periodic jobs, add the following lines to
     /etc/periodic.conf:

           daily_show_success=NO
           daily_show_info=NO
           daily_show_badconfig=NO

DIAGNOSTICS
     The command may fail for one of the following reasons:

     usage: periodic <directory of files to execute>  No directory path argument was passed to periodic to
     specify where the script fragments reside.

     <directory> not found  Self explanatory.

SEE ALSO
     sh(1), periodic.conf(5), launchd(8), newsyslog(8)

HISTORY
     The periodic utility first appeared in FreeBSD 3.0.

AUTHORS
     Paul Traina <pst@FreeBSD.org>
     Brian Somers <brian@Awfulhak.org>

BUGS
     Since one specifies information about a directory using shell variables containing the string,
     <basedir>, <basedir> must only contain characters that are valid within a sh(1) variable name, alphanu-merics alphanumerics
     merics and underscores, and the first character may not be numeric.

BSD                             August 30, 2007                            BSD