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Linux就该这么学【常用】
开源中国【备用】
苍鹰博客【备用】
注：Linux离线帮助手册推荐命令行工具tldr，该工具将常用命令选项进行了范例列举，以免于去阅读繁杂的man帮助。
Lebara PayGo eSIM简略食用教程