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Leave it to a proprietary software vendor to turn a cheap and easy parlor trick into a selling point. "Hey guys, why don't we turn our _collection of multiple files_ into a *collection of multiple files*!!" Extract the ^above with this:
cat pics.tar.gz.??? | tar xzv
^extract on any Unix - no need to install junkware!
(If you must make proprietary software, at least make it do something *new*)
if [ -e windows ]; then use 7-Zip
There is 1 alternative - vote for the best!
If you can do better, submit your command here.
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if [ -e windows ]; then use Cygwin
Obviously, to reconstruct a single original tar/tar.gz file just cat all the files, redirecting output to a file:
cat pics.tar.gz??? > single_tarfile.tar.gz-d is not avail on macos (split)
tar czv FILE_OR_FOLDER | split -a 3 -b 16m - pics.tar.gz