awk `1` input-file
上面awk命令打印出输入文件的每一行。因为对每一个'/pattern/{action}'，如果省略{action}，则{action}等价于{print}，没有参数的print会打印整个行。所以上述命令变成：
awk `1{print}` input-file
1相当于永远为true。因此会打印文件的每一行。举例如下：
# cat employee.txt
101,John Doe,CEO
102,Jason Smith,IT Manager
# awk '1' employee.txt
101,John Doe,CEO
102,Jason Smith,IT Manager
参考资料：
Awk One-Liners Explained, Part I: File Spacing, Numbering and Calculations。
本文摘自Introduction To SAP HANA Database- For Beginners。
SAP HANA是一个in-memory database，它包含下列特性：
It is a combination of hardware and software made to process massive real time data using In-Memory computing.
It combines row-based, column-based database technology.
Data now resides in main-memory (RAM) and no longer on a hard disk.
It’s best suited for performing real-time analytics, and developing and deploying real-time applications.
SAP HANA体系结构如下图所示：
