crontab(1)                 DG/UX 4.30                  crontab(1)



     NAME
          crontab - user crontab file in DG/UX

     SYNOPSIS
          crontab [file]
          crontab -r
          crontab -l

     DESCRIPTION
          Crontab copies the specified file, or standard input if no
          file is specified, into a directory that holds all users'
          crontab entries.  Crontab entries are commands a user wants
          cron to execute at a specified time using a subshell.  The
          -r option removes a user's crontab from the crontab
          directory.  Crontab -l will list the crontab file for the
          invoking user.

          A user is permitted to use crontab if their name appears in
          the file /var/spool/cron/cron.allow.  If that file does not
          exist, the file /var/spool/cron/cron.deny is checked to
          determine if the user should be denied access to crontab. If
          neither file exists, only root is allowed to submit a job.
          The allow/deny files consist of one user name per line.

          A crontab file consists of lines of six fields each.  The
          fields are separated by spaces or tabs.  The first five are
          integer patterns that specify the time at which the commands
          are to be executed by cron.  These are as follows:

               minute (0-59),
               hour (0-23),
               day of the month (1-31),
               month of the year (1-12),
               day of the week (0-6 with 0=Sunday).

          Each of these patterns may be either an asterisk  (meaning
          all legal values), or a list of elements separated by
          commas.  An element is either a number, or two numbers
          separated by a minus sign (meaning an inclusive range).
          Note that the specification of days may be made by two
          fields (day of the month and day of the week).  If both are
          specified as a list of elements, both are adhered to.  For
          example, 0 0 1,15 * 1 would run a command on the first and
          fifteenth of each month, as well as on every Monday.  To
          specify days by only one field, the other field should be
          set to * (for example, 0 0 * * 1 would run a command only on
          Mondays).

          The sixth field of a line in a crontab file is a string that
          is executed by the shell at the specified times.  A percent
          character in this field (unless escaped by \) is translated
          to a new-line character.  When your crontab entry is



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     crontab(1)                 DG/UX 4.30                  crontab(1)



          executed, only the first line (up to a % or end of line) of
          the command field is executed by the subshell.  The other
          lines are made available to the command as standard input.

          The subshell is invoked from your $HOME directory with an
          arg0 of sh.  Users who desire to have their .profile
          executed must explicitly do so in the crontab file.  Cron
          supplies a default environment for every shell, defining
          HOME, LOGNAME, SHELL(=/bin/sh), and PATH(=:/bin:/usr/bin:).

          NOTE:  Users should remember to redirect the standard output
          and standard error of their commands in the crontab file!
          If this is not done, any generated output or errors will be
          mailed to the user.

     FILES
          /var/spool/cron             main cron directory
          /var/spool/cron/crontabs    spool area
          /var/spool/cron/log         accounting information
          /var/spool/cron/cron.allow  list of allowed users
          /var/spool/cron/cron.deny   list of denied users

     SEE ALSO
          at(1), sh(1).
          cron(1M) in the System Manager's Reference for the DG/UX
          System





























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