Given a stdout of some prog, I have to filter out 2-line blocks of
text, where the first line contains "marker1" and the second line
contains "marker2".
Thus, for the following output
some text..
more text...marker1...moretext
more text...marker2...moretext
more text..
more text...marker1...moretext
more text..
more text...marker2...moretext
more text...
after applying the filter I shell get
some text..
more text..
more text...marker1...moretext
more text..
more text...marker2...moretext
more text...
For one-line case grep whould be just sufficient:
../prog | grep -v marker1
however for multiline patterns I think grep is not a right choice. How
it can be done with awk/sed?
