Thanks a lot for you answer, gzwrite is interesting : 
open FFF, "<fu.txt"  or die "$!" ;
binmode FFF ;
$gz = gzopen("fu.txt.gz", "wb") or die "gzerror" ;
while ($buffer = <FFF>) { $gz->gzwrite($buffer) }
close FFF ;
$gz -> gzclose ;

[download]
The resulting file is a valid gz file.
I have to point out that i'm under win32, hence the binmode (otherwise newlines are washed out when i uncompress the file).

But, i have a problem here : what i need to obtain is a .Z file and not a .gz .
This might not be mandatory, but the resulting file is sent to someone else and i'll have to check if his programs can deal with a .gz .

Do you know if Compress::Zlib will allow me to create a .Z file ? For exemple with inflate / deflate ? Or is zlib for gz compression only ?

Thanks a lot,

ZlR .

In reply to Re^2: Compress::Zlib : what to do with the "in memory" data ? by ZlR
in thread Compress::Zlib : what to do with the "in memory" data ? by ZlR

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