Merge .gz without unzipping

mayur.tesla@gmail.com · 11-24-2015, 08:53 AM

Is there any way to merge two or more .gz files without unzipping file?

jpollard · 11-24-2015, 11:53 AM

I don't think so. gzip requires everything to be present (chaining blocks I think) which causes an issue.

Thus appending another compressed file to the end of one would just confuse gzip - making a corrupted file.

John VV · 11-24-2015, 02:07 PM

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Valery Reznic · 11-25-2015, 03:37 AM

Quote:

Originally Posted by mayur.tesla@gmail.com

Is there any way to merge two or more .gz files without unzipping file?

As long as I remember you can just

Code:

cat a.gz b.gz > c.gz

Then if you unzip c.gz then result will be concatenation of files 'a' and 'b'

Sure it's hold for .xz and .bz2 formats. About .gz you have to check.

By the way, why do you want do such a thing?

michaelk · 11-25-2015, 05:42 AM

Code:

cat a.gz b.gz > c.gz

This will not work for the reason given above. The gzip man page does have an example of merging files but not if they are already compressed.
Appending the files together should not corrupt them its just that the first does not have any clue the second exists. I do not know of way either.

pan64 · 11-25-2015, 06:09 AM

just a comment, how it works? http://computerplumber.com/2014/03/m...iles-together/
And another solution:
http://stackoverflow.com/questions/2...mpressing-them

michaelk · 11-25-2015, 06:40 AM

I did finally find the posted links... I was wrong and my memory failed me again.

Hmm. cat does work.