Como faço para dividir um arquivo .zip em vários segmentos?

Eu tenho todos os utilitários de linha de comando instalados e preciso dividir um .zip(s) novo (s) arquivo (s) existente (s) em .zipsegmentos (50MB) no Terminal.

Pasta X = 900MB> Criar .ziparquivo auto-extraível > Dividir .ziparquivo em segmentos de 50 MB (ou seja Folder.X.001.zip)

De acordo com a página do manual, aqui estão os comandos:

Copyright (c) 1990-2008 Info-ZIP - Type 'zip "-L"' for software license.
Zip 3.0 (July 5th 2008). Usage:
zip [-options] [-b path] [-t mmddyyyy] [-n suffixes] [zipfile list] [-xi list]
  The default action is to add or replace zipfile entries from list, which
  can include the special name - to compress standard input.
  If zipfile and list are omitted, zip compresses stdin to stdout.
  -f   freshen: only changed files  -u   update: only changed or new files
  -d   delete entries in zipfile    -m   move into zipfile (delete OS files)
  -r   recurse into directories     -j   junk (don't record) directory names
  -0   store only                   -l   convert LF to CR LF (-ll CR LF to LF)
  -1   compress faster              -9   compress better
  -q   quiet operation              -v   verbose operation/print version info
  -c   add one-line comments        -z   add zipfile comment
  -@   read names from stdin        -o   make zipfile as old as latest entry
  -x   exclude the following names  -i   include only the following names
  -F   fix zipfile (-FF try harder) -D   do not add directory entries
  -A   adjust self-extracting exe   -J   junk zipfile prefix (unzipsfx)
  -T   test zipfile integrity       -X   eXclude eXtra file attributes
  -y   store symbolic links as the link instead of the referenced file
  -e   encrypt                      -n   don't compress these suffixes
  -h2  show more help

com -h2eu recebo:

Splits (archives created as a set of split files):
  -s ssize  create split archive with splits of size ssize, where ssize nm
              n number and m multiplier (kmgt, default m), 100k -> 100 kB
  -sp       pause after each split closed to allow changing disks
      WARNING:  Archives created with -sp use data descriptors and should
                work with most unzips but may not work with some
  -sb       ring bell when pause
  -sv       be verbose about creating splits
      Split archives CANNOT be updated, but see --out and Copy Mode below

.....

Using --out (output to new archive):
  --out oa  output to new archive oa
  Instead of updating input archive, create new output archive oa.
  Result is same as without --out but in new archive.  Input archive
  unchanged.
      WARNING:  --out ALWAYS overwrites any existing output file
  For example, to create new_archive like old_archive but add newfile1
  and newfile2:
    zip old_archive newfile1 newfile2 --out new_archive
  Cannot update split archive, so use --out to out new archive:
    zip in_split_archive newfile1 newfile2 --out out_split_archive
  If input is split, output will default to same split size
  Use -s=0 or -s- to turn off splitting to convert split to single file:
    zip in_split_archive -s 0 --out out_single_file_archive
      WARNING:  If overwriting old split archive but need less splits,
                old splits not overwritten are not needed but remain

Você existing.zipdeseja dividi-lo em 50Mpartes dimensionadas.

zip existing.zip --out new.zip -s 50m

irá criar

new.zip
new.z01
new.z02
new.z03
....

Para extraí-los, você deve primeiro coletar os arquivos juntos e executar zip -F new.zip --out existing.zipou zip -s0 new.zip --out existing.zip, para recriar seus arquivos existing.zip. Então você pode simplesmente unzip existing.zip.

Você esperaria unzip new.zipque funcionasse, mas infelizmente não foi implementado

warning [new.zip]:  zipfile claims to be last disk of a multi-part archive;
  attempting to process anyway, assuming all parts have been concatenated
  together in order.  Expect "errors" and warnings...true multi-part support
  doesn't exist yet (coming soon).

e nos meus testes, concatenar as partes como sugeridas, ou seja, com cat e executando descompactar, não conseguiu extrair todos os meus arquivos .

Isto é o que funciona para mim:

zip -s 50m new.zip big.iso

Para peças de 50MG

new.zip
new.z01
new.z02
...

Crie pedaços de 3G com isso (bom para colocar arquivos grandes em um disco FAT32)

zip -s 3g new.zip big.iso

Novos Mac OSs extraem esses arquivos ao clicar duas vezes no arquivo new.zip

Eu tive que usar o Unarchiver para extrair o arquivo ZIP multiparte resultante também, mas, estranhamente, ele recriou o caminho original para o arquivo zip. por exemplo, eu criei originalmente o arquivo aqui:

/ Volumes / HD externo / Pasta de teste / my-multipart-archive-parts.zip

E copiou todas as partes do arquivo para aqui:

~ / Desktop / Pasta de teste /

Quando usei o Unarchiver para extrair os arquivos, ele criou o seguinte:

~ / Área de trabalho / Pasta de teste / Volumes / HD externo / Pasta de teste / my-multipart-archive.zip

Muito estranho...