Figure 2: Sample crontab file

# Update configuration files if necessary
50    * * * *   cd /etc ; /usr/bin/make
#
# Update crontab based if necessary
40    * * * *   cd /usr/local/admin/cron ; /usr/bin/make
#
# Keep history of changes
30    * * * *   cd /usr/local/admin/savesys ; /usr/bin/make
#
#
# Nightly invocation of calendar.
0    4 * * *   /usr/bin/calendar -a
#
# Nightly Log Rotation
59    23 * * *  /usr/local/admin/bin/logsave
#
# Clean out old core files silently
0    3  * * *  find / -name '*.core' -print | xargs rm -f
#
0,15,30,45  * * * *   /usr/bin/at
#
0    2 * * *   sh /etc/daily   2>&1 | mail -s "daily output" root
30    3 * * 6   sh /etc/weekly  2>&1 | mail -s "weekly output" root
30    5 1 * *   sh /etc/monthly 2>&1 | mail -s "monthly output" root

5    * * * *   /usr/local/admin/bin/free
5    2 * * *   /usr/local/admin/bin/police

0    1 * * *   cd /usr/local/admin/fdist ; /usr/bin/make