


      CRONTAB(1)                  (UNIX 5.2)                 CRONTAB(1)



      NAME
           crontab - user crontab file

      SYNTAX
           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'
           crontabs.  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 /usr/lib/cron/cron.allow. If that file does not
           exist, the file /usr/lib/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.
           If either file is at.deny, global usage is permitted.  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 following:

                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.  Only the first line (up to a % or
           end of line) of the command field is executed by the shell.
           The other lines are made available to the command as



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      CRONTAB(1)                  (UNIX 5.2)                 CRONTAB(1)



           standard input.

           The shell 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:/usr/lbin).

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

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

      SEE ALSO
           cron(1), sh(1).


































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