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cron (1)
  • >> cron (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • cron (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
  • cron (8) ( FreeBSD man: Команды системного администрирования )
  • cron (8) ( Русские man: Команды системного администрирования )
  • cron (8) ( Linux man: Команды системного администрирования )
  • Ключ cron обнаружен в базе ключевых слов.
  •  

    NAME

    cron - clock daemon
     
    

    SYNOPSIS

    /usr/sbin/cron 
    

     

    DESCRIPTION

    cron starts a process that executes commands at specified dates and times.

    You can specify regularly scheduled commands to cron according to instructions found in crontab files in the directory /var/spool/cron/crontabs. Users can submit their own crontab file using the crontab(1) command. Commands which are to be executed only once can be submitted using the at(1) command.

    cron only examines crontab or at command files during its own process initialization phase and when the crontab or at command is run. This reduces the overhead of checking for new or changed files at regularly scheduled intervals.

    As cron never exits, it should be executed only once. This is done routinely by way of the svc:/system/cron:default service. The file /etc/cron.d/FIFO file is used as a lock file to prevent the execution of more than one instance of cron.

    cron captures the output of the job's stdout and stderr streams, and, if it is not empty, mails the output to the user. If the job does not produce output, no mail is sent to the user. An exception is if the job is an at(1) job and the -m option was specified when the job was submitted.

    cron and at jobs are not executed if your account is locked. Jobs and processses execute. The shadow(4) file defines which accounts are not locked and will have their jobs and processes executed.  

    Setting cron Jobs Across Timezones

    The timezone of the cron daemon sets the system-wide timezone for cron entries. This, in turn, is by set by default system-wide using /etc/default/init.

    If some form of daylight savings or summer/winter time is in effect, then jobs scheduled during the switchover period could be executed once, twice, or not at all.  

    Setting cron Defaults

    To keep a log of all actions taken by cron, you must specify CRONLOG=YES in the /etc/default/cron file. If you specify CRONLOG=NO, no logging is done. Keeping the log is a user configurable option since cron usually creates huge log files.

    You can specify the PATH for user cron jobs by using PATH= in /etc/default/cron. You can set the PATH for root cron jobs using SUPATH= in /etc/default/cron. Carefully consider the security implications of setting PATH and SUPATH.

    Example /etc/default/cron file:

    CRONLOG=YES
    PATH=/usr/bin:/usr/ucb:
    

    This example enables logging and sets the default PATH used by non-root jobs to /usr/bin:/usr/ucb:. Root jobs continue to use /usr/sbin:/usr/bin.

    The cron log file is periodically rotated by logadm(1M).  

    FILES

    /etc/cron.d

    Main cron directory

    /etc/cron.d/FIFO

    Lock file

    /etc/default/cron

    cron default settings file

    /var/cron/log

    cron history information

    /var/spool/cron

    Spool area

    /etc/cron.d/queuedefs

    Queue description file for at, batch, and cron

    /etc/logadm.conf

    Configuration file for logadm

     

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    AvailabilitySUNWcsu

     

    SEE ALSO

    svcs(1), at(1), crontab(1), sh(1), logadm(1M), svcadm(1M), queuedefs(4), shadow(4), attributes(5), rbac(5), smf(5), smf_security(5)  

    NOTES

    The cron service is managed by the service management facility, smf(5), under the service identifier:

    svc:/system/cron:default
    

    Administrative actions on this service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). The service's status can be queried using the svcs(1) command. Most administrative actions may be delegated to users with the solaris.smf.manage.cron authorization (see rbac(5) and smf_security(5)).  

    DIAGNOSTICS

    A history of all actions taken by cron is stored in /var/cron/log and possibly in /var/cron/olog.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    Setting cron Jobs Across Timezones
    Setting cron Defaults
    FILES
    ATTRIBUTES
    SEE ALSO
    NOTES
    DIAGNOSTICS


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