# Functions
CheckIfaceExist : Check if given network interface name is exist in local system.
CheckIPLink : Check if we are ready to use ip command.
CheckIPTABLES : Check if we are ready to use iptables.
CheckMySQL : Check if we are ready to use mysql command.
CheckRoot : Check root permission (Check if euid is 0).
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IncreaseRLimitToMax : Increase rLimit to system max.