cp -R 和cp -r的区别-优快云博客

本文链接：https://blog.youkuaiyun.com/compard/article/details/40214839

本文详细解析了`cp`命令中`-r`和`-R`两个参数的区别。`-r`标志递归复制文件及目录，特殊文件也会按普通文件处理。而`-R`不仅递归复制常规文件和目录，还会在目标目录中重新创建特殊文件类型，如FIFO、设备文件。此外，`-R`会遵循符号链接，除非指定`-h`选项。如果未明确指定-H、-L或-P选项，其默认行为未定义。

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-r
            Copies file hierarchies under the file or directory specified by the SourceFile or SourceDirectory parameter
            (recursive copy). The -r flag processes special files in the same manner as regular files.
-R
            Copies file hierarchies under the regular files and directories from the directory specified by the SourceFile or
            SourceDirectory parameter to the directory specified by the TargetDirectory parameter. Special file types, such as

first-in, first-out (FIFO) files and block and character device files, are re-created instead of copied. Symbolic
links are followed unless the -h flag is specified. (The -R flag is preferred to the -r flag.)

            If none of the -H, -L, or -P options were specified, it is unspecified which of those options will be used as the
            default. Consider the following:
              *    If the -H option was specified, the cp command will take action based on the type and contents of the file
                   referenced by any symbolic link specified as a SourceFile operand.
              *    If the -L option was specified, the cp command will take action based on the type and contents of the file
                   referenced by any symbolic link specified as a SourceFile operand or any symbolic links encountered during
                   traversal of a file hierarchy.
              *    If the -P option was specified, the cp command will copy any symbolic link specified as a SourceFile operand
                   and any symbolic links encountered during traversal of a file hierarchy and will not follow any symbolic links.