https://help.ubuntu.com/community/CronHowto

# cat /etc/logrotate.conf
...
include /etc/logrotate.d
...

# cat /etc/logrotate.d/clamav-daemon

/var/log/clamav/clamav.log {
     rotate 12
     weekly
     compress
     delaycompress
     create 640 clamav adm
     postrotate
     /etc/init.d/clamav-daemon reload-log > /dev/null
     endscript
     } 

# cat /etc/init.d/clamav-daemon

     ...
. /lib/lsb/init-functions
     ...
[ -n "$THEPIDFILE" ] || THEPIDFILE='/var/run/clamav/clamd.pid'
     ...
  CLAMDPID=`pidofproc -p $THEPIDFILE $DAEMON`
     ...
  reload-log)
  OPTIND=1
  log_daemon_msg "Reloading log file for $DESC" "$NAME"
  if [ "$RUNNING" = 0 ] && [ -n "$CLAMDPID" ]; then
    kill -HUP $CLAMDPID
  fi
     ...

# cat /etc/logrotate.d/cisco

/var/log/cisco.log {
     rotate 5
     size 100k
     compress
     create 640 syslog adm
     postrotate
       reload rsyslog >/dev/null 2>&1 || true
     endscript
}

# cat cisco_log_gen.sh

while :
do
  logger -t cisco -p local0.info "Message 1"
  logger -t cisco -p local0.info "Message 2"
done

# sh cisco_log_gen.sh
...
<Ctrl>-C

# tail -f /var/log/cisco.log
...
<Ctrl>-C

# logrotate /etc/logrotate.conf

# ls -l /var/log/cisco.log*

https://help.ubuntu.com/community/AutoWeeklyUpdateHowTo

Резервное копирование и восстановление

# crontab -e

# crontab -l
# m h  dom mon dow   command
*/5 * * * * /root/backup_conf.sh

# crontab -r

# cat /etc/crontab
...

# !!!! Don't work with .sh !!!!
# cp /root/backup_conf.sh /etc/cron.daily/backupconf

# run-parts --report /etc/cron.daily

# cat /etc/crontab

# apt-get install anacron

# man anacrontab

# cat /etc/anacrontab
...

# start anacron

# ls /var/spool/anacron

# ls /etc/init/atd.conf

# echo "Hello from at > `tty`" | at now + 3 minutes

# echo "Hello from at > `tty`" | at 18:40

# echo "rm –rf /*" | at 23:59 12/31/2015

# atq

# atrm 3

# at -c 2
...