第二个tar命令从stdin读取归档文件并进行展开，展开(x)选项后面使用的连字号表示stdin。
The second tar reads an archive from stdin and expands it in place; the hyphen used with the extract (x) option refers to stdin.
读取活动和归档的DB 2日志，以便快速识别、纠正和还原错误资料。
It reads active and archived DB2 logs to quickly identify, correct, and restore erroneous data.
PasswdFileInboundApp将从输入目录读取passwd . txt文件，并将该文件的内容输出到在归档目录中创建的新文件中。
PasswdFileInboundApp reads the passwd.txt file from the input directory and output the file's contents into a new file created in the archive directory.
应用推荐