鉴于grep命令中所有的选项egrep都能够使用（egrep更加强大），为方便起见我将使用egrep命令为大家演示： 例一：显示出文件/etc/passwd含有root的行 例三：显示出/etc/passwd中有多少..
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linux egrep 命令参数及用法详解
You had used regexps for egrep, sed, and perl; now try building it for plain grep.
前面已经使用了适用于egrep、sed和perl的regexp，现在我们将尝试构建适用于普通grep的regexp。
Besides the capacity to search for multiple objects, egrep offers the ability to search for repetitions and groups.
除了搜索多个目标的功能之外，egrep还提供了重复搜索和分组搜索的功能。
Look for a few processes running with couchdb in their path by piping the ps output to egrep. You should see something along the lines of the output shown in Listing 1.
通过将ps输出传递给egrep，查看在路径中使用couchdb的进程。
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