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查看linux /var/log/messages下的日志是发现大量如下信息：
Fed 3 04:03:02 cs1 syslogd 1.4.1: restart. Jun 3 0
Feb 9 07:35:01 tonykorn97 crond(pam_unix)[1442]: session opened for user root by (uid=0)
Feb 9 07:35:01 tonykorn97 crond(pam_unix)[1442]: session closed for user root
Feb 9 07:40:01 tonykorn97 crond(pam_unix)[1445]: session opened for user root by (uid=0)
Feb 9 07:40:01 tonykorn97 crond(pam_unix)[1446]: session opened for user root by (uid=0)
Feb 9 07:40:01 tonykorn97 crond(pam_unix)[1445]: session closed for user root
Feb 9 07:40:02 tonykorn97 crond(pam_unix)[1446]: session closed for user root
Feb 9 07:45:01 tonykorn97 crond(pam_unix)[1450]: session opened for user root by (uid=0)
Feb 9 07:45:01 tonykorn97 crond(pam_unix)[1450]: session closed for user root
Feb 9 07:50:01 tonykorn97 crond(pam_unix)[1452]: session opened for user root by (uid=0)
Feb 9 07:50:01 tonykorn97 crond(pam_unix)[1453]: session opened for user root by (uid=0)
Feb 9 07:50:01 tonykorn97 crond(pam_unix)[1452]: session closed for user root
Feb 9 07:50:01 tonykorn97 crond(pam_unix)[1453]: session closed for user root
Feb 9 07:55:01 tonykorn97 crond(pam_unix)[1458]: session opened for user root by (uid=0)
Feb 9 07:55:02 tonykorn97 crond(pam_unix)[1458]: session closed for user root
Feb 9 07:56:40 tonykorn97 sshd(pam_unix)[1463]: session opened for user root by root(uid=0
请问：这日志内容正常吗？还是crond服务的正常产生？如何不产生这些日志
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