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cron/crontab

Referring to the page:
http://qiita.com/katsukii/items/d5f90a6e4592d1414f99

Step1: Checking Daemon 
[root@ip-172-31-27-217 cron]# service crond status

crond (pid  1306) is running...

Step2: Editting shell: date command and ping 8.8.8.8 and write the outputs into hoge.txt
[root@ip-172-31-27-217 ~]# more ping.sh 
date >> hoge.txt;
ping -c 1 8.8.8.8 | grep 'from'  >> hoge.txt

Step3. Editting crontab
[root@ip-172-31-27-217 ~]# crontab -e
*/10 * * * * cd /root; ./ping.sh

Result 
[root@ip-172-31-27-217 ~]# more hoge.txt 
Mon Oct 31 03:20:01 EDT 2016
64 bytes from 8.8.8.8: icmp_seq=1 ttl=59 time=3.53 ms
Mon Oct 31 03:30:01 EDT 2016
64 bytes from 8.8.8.8: icmp_seq=1 ttl=59 time=3.51 ms
Mon Oct 31 03:40:01 EDT 2016
64 bytes from 8.8.8.8: icmp_seq=1 ttl=59 time=3.60 ms
Mon Oct 31 03:50:01 EDT 2016
64 bytes from 8.8.8.8: icmp_seq=1 ttl=59 time=3.54 ms
Checking the crontab
[root@ip-172-31-27-217 ~]# crontab -l
*/10 * * * * cd /root; ./ping.sh

Deleting crontab
[root@ip-172-31-27-217 ~]# crontab -r
Checking the logs of cron
[root@ip-172-31-27-217 ~]# more /var/log/cron
<snip>
Oct 31 03:20:01 ip-172-31-27-217 CROND[5316]: (root) CMD (cd /root; ./ping.sh)
Oct 31 03:20:01 ip-172-31-27-217 CROND[5315]: (root) CMD (/usr/lib64/sa/sa1 1 1)
Oct 31 03:30:01 ip-172-31-27-217 CROND[5343]: (root) CMD (/usr/lib64/sa/sa1 1 1)
Oct 31 03:30:01 ip-172-31-27-217 CROND[5344]: (root) CMD (cd /root; ./ping.sh)
Oct 31 03:37:02 ip-172-31-27-217 anacron[2426]: Job `cron.weekly' started
Oct 31 03:37:02 ip-172-31-27-217 anacron[2426]: Job `cron.weekly' terminated
Oct 31 03:40:01 ip-172-31-27-217 CROND[5389]: (root) CMD (cd /root; ./ping.sh)
Oct 31 03:40:01 ip-172-31-27-217 CROND[5390]: (root) CMD (/usr/lib64/sa/sa1 1 1)
Oct 31 03:50:01 ip-172-31-27-217 CROND[5415]: (root) CMD (/usr/lib64/sa/sa1 1 1)
Oct 31 03:50:01 ip-172-31-27-217 CROND[5416]: (root) CMD (cd /root; ./ping.sh)

Oct 31 03:55:34 ip-172-31-27-217 crontab[5430]: (root) BEGIN EDIT (root)

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