I have a file consisting of groups of lines (unknown number of lines in
each group).
Each line begins by a 6 digit number, followed by an unknown sequence of
words and numbers.
Consecutive lines starting with the same number form a group.
My problem is to combine lines from each group into a single line, keeping
only the first occurrence of the distinctive number.
I have been able to "find" groups using the pattern
(\d{6})(.+)(?:\r\1(.+))+
However, this does not appear to store the expressions matching the inner
parentheses into separate variables.
Is there a way to achieve the desired replacement using grep?
Thanks in advance
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