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Thanks Guru for your detailed explanation.

Thanks Scrutinizer for sharing the code using awk. It works as well.

Thanks Guru. It works like a charm.
It would be great if you can explain this command.

Hi,

1. Each message starts with date
2. There is blank line between each message
3. Each message does not contain same number of lines.

Any help in merging multiple lines in each message to a...

Thanks Ranga for your quick reply.

I would like to read first and last column of a given line (line by line not the entire file) and store in a table.

Can you help to match this requirement?
...

Hi,

My input file as follws
$ cat 1.txt
-------
a aa aaa 11
b bb bbb 22

I am able to extract first and last column of a given line as follows.
$ nawk '{print $1}' FS= RS= 1.txt | awk '{...