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crontabの設定について

deiceを使わず、crontabの設定で動的IP変化に対応!
# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# m h dom mon dow user command
17 * * * * root    cd / && run-parts --report /etc/cron.hourly
25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
#
# cp chkip.dat
# 53 2 * * 2 root cp /root/chkip.dat /home/cmd/chkip/
# chkbip.sh
# */3 * * * * root /root/chkbip.sh
?? * * * *   root wget -q 'http://free.ddo.jp/dnsupdate.php?dn=jh1rfm&pw=????????' -->適宜に
?? ?? * * * root rm -rf /root/dnsupdate.php?dn=*  -->適宜に