chmod用于改变文件或目录的访问权限。用户用它控制文件或目录的访问权限。该命令有两种用法。一种是包含字母和操作符表达式的文字设定法；另一种是包含数字的数字设定法。 u 表示“用户（user）”，即文件或目录的所有者。 g 表示“同组（group）用户 ...

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Linux is a multi-user operating system. What does that mean? Like all good operating systems, you can have multiple user accounts on one machine. You can also have more than one user logged in at once ...

I once locked myself out of my files with a simple mistyped command. This was the first time I rendered my Linux installation unusable, and it was because I didn’t understand permissions. While I ...