Bash keeps a record of what the user has typed exactly and writes it to a hidden file called.bash_history within the user's home directory.
bash会准确地记录用户输入的命令，并把记录写到用户主目录中的隐藏文件. bash_history中。
When a client creates an HDFS file, it computes a checksum of each block of the file and stores these checksums in a separate hidden file in the same HDFS namespace.
当某个客户端创建一个新的HDFS文件，会计算这个文件每个block的校验和，并作为一个单独的隐藏文件保存这些校验和在同一个HDFS namespace下。
When a client creates an HDFS file, it computes a checksum of each block of the file and stores these checksums in a separate hidden file in the same HDFS namespace.
当某个客户端创建一个新的HDFS文件，会计算这个文件每个block的校验和，并作为一个单独的隐藏文件保存这些校验和在同一个HDFS namespace下。
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