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Top Forums UNIX for Dummies Questions & Answers Cron Allow Post 47132 by Optimus_P on Tuesday 3rd of February 2004 12:55:29 PM

02-03-2004

Registered User

Code:

User Commands                                          crontab(1)

NAME
     crontab - user crontab file

SYNOPSIS
     crontab [ filename ]

     crontab [ -elr ]  username

DESCRIPTION
     The crontab utility manages a user's access with  cron  (see
     cron(1M))  by copying, creating, listing, and removing cron-
     tab files.  If invoked without options, crontab  copies  the
     specified  file,  or the standard input if no file is speci-
     fied, into a directory that holds all users' crontabs.

  crontab Access Control
     Users: Access to crontab is allowed:

        o  if the user's name appears in /etc/cron.d/cron.allow.

        o  if  /etc/cron.d/cron.allow  does  not  exist  and  the
           user's name is not in /etc/cron.d/cron.deny.

     Users: Access to crontab is denied:

        o  if /etc/cron.d/cron.allow exists and the  user's  name
           is not in it.

        o  if /etc/cron.d/cron.allow does not  exist  and  user's
           name is in /etc/cron.d/cron.deny.

        o  if  neither  file  exists,  only  a  user   with   the
           solaris.jobs.user authorization is allowed to submit a
           job.

     Note that the rules for allow and deny apply to root only if
     the allow/deny files exist.

# cat /etc/cron.d/cron.deny
daemon
bin
smtp
nuucp
listen
nobody
noaccess

Optimus_P

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cron

cron(8) 						      System Manager's Manual							   cron(8)

NAME

       cron - The system clock daemon

SYNOPSIS

       /usr/sbin/cron

DESCRIPTION

       The cron daemon runs shell commands at specified dates and times.  Commands that are to run according to a regular or periodic schedule are
       found within the crontab files.	Commands that are to run once only are found within the at files.  You submit crontab and at file  entries
       by  using  the  crontab	and  at  commands.  Because the cron process exits only when killed or when the system stops, only one cron daemon
       should exist on the system at any given time.  Normally, you start the cron daemon from within a run command file.

       During process initialization and when cron detects a change, it examines the crontab and at files.  This strategy reduces the overhead	of
       checking  for  new  or  changed files at regularly scheduled intervals.	The cron command creates a log of its activities.  The cron daemon
       must be started from the system startup scripts because it must begin execution without a login user ID set.  The cron daemon  starts  each
       job  with the following process attributes stored with the job by the invoking process: Login user ID Effective and real user IDs Effective
       and real group IDs Supplementary groups

       It also establishes the following attributes from the authentication profile of the account associated with the login user ID of the invok-
       ing process: Audit control and disposition masks Kernel authorizations

DIAGNOSTICS

       The at and batch programs will refuse to accept jobs submitted from processes whose login user ID is different from the real user ID.

FILES

       Specifies the command path.  Main cron directory Directory containing the crontab files.  List of allowed users.  List of denied users His-
       tory information for cron Queue description file for at, batch, and cron

RELATED INFORMATION

       Commands:  at(1), crontab(1), rc0(8), rc2(8), rc3(8)

       Files: queuedefs(4) delim off

																	   cron(8)

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