How to list VIPs and associated Pool members?

egrep and grep -E are same. Its an extended. Lets say you want to search multiple variables in a line or a file (basically an input). You can simply use grep -E "variable1 | variable2 | variable3"

Example:

If a file has the below 5 lines in it.

The file has 4 entries
first line
second line
third line
fourth line

#cat file | grep first

first line

#cat file | grep -E "first | second"

first line
second line

#cat file | grep line

first line
second line
third line
fourth line

Hope you got the idea.