Description: CISSP instructor in Taiwan and 5-star book author on Amazon. His "Effective CISSP" Facebook Group and YouTube Channel provide in-depth and valuable resources for Certified Information Systems Security Professional. 吳文智老師提供最深入而專業的CISSP學習心得分享與認證課程，以及CISSP證照考試,考試心得,價格與價值解惑,薪水,題庫,教材,講義,及自學等資訊。
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Linux provides a variety of shells available in /etc/shells.
The Network Mapper (Nmap) utility can do the following tasks: