Boas tenho o contrab assim:
# /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 )
#
0 1  * * *   root    reboot
#00 3   * * *   root    /emu/script/./configupdate.sh >> /emu/log/configupdate.log 2>&1
#15,45 *        * * *   root    /emu/script/./illegal.sh >> /emu/log/illegal.log 2>&1
#*/5 *  * * *   root    /emu/script/./check.sh >>/emu/log/check.log 2>&1
#00 3   * * *   root    /emu/script/./configupdate.sh >> /emu/log/configupdate.log 2>&1
#15,45 *        * * *   root    /emu/script/./illegal.sh >> /emu/log/illegal.log 2>&1
#*/5 *  * * *   root    /emu/script/./check.sh >>/emu/log/check.log 2>&1
#02 *   * * *   root    wget -O - 
http://127.0.0.1/cron_update.php?p=1 >/dev/null 2>&1
#30 *   * * *   root    wget -O - 
http://127.0.0.1/cron_ping.php?p=1 >/dev/null 2>&1
10 11 * * * /sbin/shutdown -r now
CTRL+X
YES
Será que cometi algu erro ?