/etc/cron.weekly/chkrootkit.sh:

/etc/cron.weekly/chkrootkit.sh: line 3: mail: command not found
/etc/cron.weekly/rkhunter.sh:

/etc/cron.weekly/rkhunter.sh: line 2: rkhunter: command not found

Solution :

yum install mailx.x86_64

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