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Thank you for your answer.
The example desired format I inserted earlier is displayed slightly differently to what was intended: the number copied from after the "SAMPLE" expression should be...

Hello all.
I need to rearrange a very long text file with the following format.
The number of lines in each block is variable, but is between 1 and 10.

Any hints what command could I use for...

Thanks again everyone,

the final awk approach did work, my longest file had ~1500 lines.
And apologies if I could not explain everything properly from the start....like the fact that my files not...

Thanks a lot everyone, I think raj_saini20 nailed it, this is what I need.
Was going with

sed 's/^[0-9][0-9][0-9][^0-9]/0&/;s/^[0-9][0-9][^0-9]/00&/;s/^[0-9][^0-9]/000&/' /path/to/infile

to...

Thanks RudiC,

I have tried the join command on sorted versions of my input files as well.
They are actually sorted....first column always increases.
I was suggested the padding with 0...

Sorry for the long inserts......could not see attachment button.....will look for it.
Command tried was :
join file1.txt file2.txt
Also
join -1 1 -2 1 file1.txt file2.txt

With few other...

Thanks, I have tried join, as mentioned above. But it stops at 1000....as soon as the width of the joining column changes from 3 characters to 4 Characters. I wish join could do it.....I could not...

Hi,

I would like some help with the above awk command.

I am trying to use the join command to join two files, no luck.
I need to put the second column from file2.txt into each matching field...