getSkillUpgradeCost() Netscript Function
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.. js:function:: getSkillUpgradeCost(skillName="")
    :RAM cost: 4 GB

    :param string skillName: Name of skill. Case-sensitive and must be an exact match

    This function returns the number of skill points needed to upgrade the
    specified skill.

    The function returns -1 if an invalid skill name is passed in.