Chunking Files with 7-Zip on Windows
From windows you can do the whole shebang directions here ==> http://www.techulator.com/resources/6601-How-split-join-files-using-7-zip-free-tool.aspx
This is my directions for chunking something on windows and then combining the chunks on Linux
On Windows you can compress and split a big file into smaller chunks using 7-Zip. This is especially good if you need to transfer them across an internet link and don’t want one massive monolithic transfer.
In Windows. Right click on the file and choose 7-Zip => Add to archive…
Then from the Add to Archive dialog box select the chunk size by either entering a value or select a predefined chunk size in the “Split to Volumes, bytes” field
So this nicely creates a series of files the size you specify
ls -1 *.7z.* bigfile20170524.7z.001 bigfile20170524.7z.002 bigfile20170524.7z.003 bigfile20170524.7z.004 bigfile20170524.7z.005 bigfile20170524.7z.006 bigfile20170524.7z.007 bigfile20170524.7z.008 bigfile20170524.7z.009 bigfile20170524.7z.010 bigfile20170524.7z.011 bigfile20170524.7z.012 bigfile20170524.7z.013 bigfile20170524.7z.014 bigfile20170524.7z.015 bigfile20170524.7z.016 bigfile20170524.7z.017 bigfile20170524.7z.018 bigfile20170524.7z.019 bigfile20170524.7z.020 bigfile20170524.7z.021
However sometimes you have to move them to Linux and then recombine them but how to do it.
When 7-Zip breaks things into chunks the first chunk has the 7-Zip header information and then the remainder are just archive data:
root@ubuntu1:/pst/pst# file bigfile20170524.7z.001 bigfile20170524.7z.001: 7-zip archive data, version 0.3 root@ubuntu1:/pst/pst# file bigfile20170524.7z.002 bigfile20170524.7z.002: data root@ubuntu1:/pst/pst# file bigfile20170524.7z.003 bigfile20170524.7z.003: data root@ubuntu1:/pst/pst# file bigfile20170524.7z.004 bigfile20170524.7z.004: data root@ubuntu1:/pst/pst# file bigfile20170524.7z.005 bigfile20170524.7z.005: data ... etc ...
So what you need to do is join file1 + file2 + file3 and output to a new file. To do that in Linux you can just use cat as follows.
The Important Bit is Here
unchunk 7-zip chunks
cat *.7z.* >> bigfile20170524.7zAnd then from there you can then use the normal command line 7-Zip to extract the files from the archive
# install 7-Zip root@ubuntu1:/pst/pst# apt-get install p7zip-full # extract the file or files from the archive with the x switch root@ubuntu1:/pst/pst# 7z x bigfile20170524.pst.7z 7-Zip  9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18 p7zip Version 9.20 (locale=C,Utf16=off,HugeFiles=on,4 CPUs) Processing archive: bigfile20170524.pst.7z