Any frequently used command can appear in this file, freeing you from having to remember some incantation that does magic.
所有常用的命令都可以放在这个文件里，这样你就不必费心记住那些复杂的魔法咒语了。
Command substitution is used at the command line, but more frequently in scripting; you will learn more about it and scripting in later articles of this series.
可以在命令行上使用命令替换，但在脚本中使用它则更常见；您将在本系列的后续文章中更多地了解它和脚本。
Lsattr (used earlier to view the hardware parameters) is another command you will be using frequently to display statistics on your interfaces.
lsattr(稍后将用于查看硬件参数)是另一个常用于显示接口统计信息的命令。
One frequently used technique is having the command line parameters be position-dependent.
一种常用的技术是让命令行参数依赖于位置。
The spawn option is frequently used to contain more than one command.
spawn选项通常用于包含多个命令。
The spawn option is frequently used to contain more than one command.
spawn选项通常用于包含多个命令。
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