crontab man page on Ultrix

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crontab(5)							    crontab(5)

Name
       crontab - clock daemon table file

Syntax
       /usr/lib/crontab

Description
       The  command  executes  at  specified  dates and times according to the
       instructions in the file. The file consists of lines  with  six	fields
       each.  The format for a line is as follows:

	      minute hour day month weekday command

       The following list defines each field in the line:

       minute (0-59)  The exact minute that the command sequence executes.

       hour (0-23)    The hour of the day that the command sequence executes.

       day (1-31)     The day of the month that the command sequence executes.

       month (1-12)   The  month  of  the  year that the command sequence exe‐
		      cutes.

       weekday (1-7)  The day of the week that the command sequence  executes.
		      Monday = 1, Tuesday = 2, and so forth.

       command	      The  complete  command  sequence	variable that is to be
		      executed.	 Note that the command string must conform  to
		      Bourne shell syntax.

       The first five integer fields may be specified as follows:

       ·   A single number in the specified range

       ·   Two numbers separated by a minus, meaning a range inclusive

       ·   A list of numbers separated by commas, meaning any of the numbers

       ·   An asterisk meaning all legal values

       The sixth field is a string that is executed by the shell at the speci‐
       fied times.  A percent sign (%) in this field is translated to  a  new-
       line character.	Only the first line of the command field, up to a per‐
       cent sign (%) or end of line, is executed  by  the  shell.   The	 other
       lines are made available to the command as standard input.

Examples
       The following example is part of a file:
       # periodic things
       0,15,30,45 * * * * (echo '^M' `date`; echo '') >/dev/console
       0,15,30,45 * * * * /usr/lib/atrun

       # daily stuff
       5 4 * * * sh /usr/adm/newsyslog
       15 4 * * * ( cd /usr/preserve; find . -mtime +7 -a -exec rm -f {} \; )
       20 4 * * * find /usr/msgs -mtime +21 -a ! -perm 444 -a ! -name bounds
	    -a -exec rm -f {} \;

       # NOTE: The above line is wrapped.

       # local cleanups
       30 4 * * * find /usr/spool/mqueue -type f -mtime +5 -name df-exec rm {} \;
       35 4 * * * find /usr/spool/mqueue -type f -mtime +5 -name tf-exec rm {} \;
       40 4 * * * find /usr/spool/rwho -type f -mtime +21 -exec rm {} \;
       #

       # redirecting error output
       0 17 * * 1,3,5 /bin/tar -cv /usr/sysads/smith > /dev/console 2>&1
       #

Files
See Also
       sh(1), cron(8)
       Guide to System Environment Setup

								    crontab(5)
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