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This number of days can be changed using parameter 1 as number of days.
Example for 21 days, running everyday at 08:00AM and 04:00PM (16:00):
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It is used only with Red Hat Enterprise Linux 6.x.
Red Hat Enterprise Linux 7.x and /CentOS 7 .x & 8 are using systemd feature to monitor service abnormal termination so the corresponding lines will not be added in the crontab.
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