Help with a particular filtering task with grep

[Eugene2]

Should be relatively simple to advanced users I presume...

I need to write a grep (either regular grep or egrep) statement that returns
all lines NOT matching a given string.

For example, I have the file "myfile" which contains the following lines:

FirstLine
SecondLine
ThirdLine

I need to run something like "grep <findEverythingNotIncluding*Second*>
myFile"

Which would return the following:

FirstLine
ThirdLine

But not return the line containing SecondLine. Of course the stuff in <> is
pseudocode instead of which I need the real expression to make it work.

If grep command syntax varies across platforms, I need something for Solaris
10's grep / egrep.

Thanks a lot.
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