如果需要定期执行某项任务，或者任务非常复杂、需要进行数据处理，同时不需要用户反复键入各种命令，则适合使用shell脚本。
If a task is to be performed on a routine basis or the task requested is complex, requiring data manipulation, rather than asking users always to type the commands, a shell script becomes useful.
虽然您可以使用php为系统管理和传统数据处理之类的任务创建命令行脚本，但是编程语言对Web应用程序的性能有主要影响。
While you can use PHP to create command-line scripts for such tasks as systems administration and traditional data processing, the language predominantly powers Web applications.
awk命令似乎始终处在Perl的阴影下，但它对于简单、基于命令行的数据处理来说是一个快速、实用的工具。
The awk command always seems to live in the shadows of Perl, but it can be a quick, useful tool for simple command-line-based data manipulation.
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