CODEWITHSUNDEEP
bashterminalzipzshunzip
watch-this
watch-this

Reputation: 1

How to unzip multi-part zip file in terminal?

Given img.zip which contains 13 copies of the same photo, I need to split the zip file into parts and be able to unzip it from the generated parts. To split it to equal 100KB parts I do:

zip img.zip --out img-pt -s 100k

which results in

100K    img-pt.z01
100K    img-pt.z02
100K    img-pt.z03
 40K    img-pt.zip

I am able to extract from the generated parts using keka on macOS. However, I am unable to unzip using unzip, here's what I try and get:

>>> unzip img-pt.zip
Archive:  img-pt.zip
warning [img-pt.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).
file #1:  bad zipfile offset (local header sig):  4
file #2:  bad zipfile offset (local header sig):  66
file #3:  bad zipfile offset (local header sig):  26614
file #4:  bad zipfile offset (lseek):  49152
file #5:  bad zipfile offset (lseek):  73728
file #6:  bad zipfile offset (local header sig):  3858
file #7:  bad zipfile offset (local header sig):  30406
file #8:  bad zipfile offset (lseek):  49152
file #9:  bad zipfile offset (lseek):  81920
file #10:  bad zipfile offset (local header sig):  7650
file #11:  bad zipfile offset (local header sig):  34198
file #12:  bad zipfile offset (lseek):  57344
file #13:  bad zipfile offset (lseek):  81920
 extracting: img/002.jpeg

also

>>> cat img-pt.z01 img-pt.z02 img-pt.z03 img-pt.zip > img.zip
>>> unzip img.zip
Archive:  img.zip
warning [img.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).
warning [img.zip]:  307200 extra bytes at beginning or within zipfile
  (attempting to process anyway)
file #1:  bad zipfile offset (local header sig):  307204
  (attempting to re-compensate)
   creating: img/
 extracting: img/001.jpeg            
 extracting: img/007.jpeg            
 extracting: img/011.jpeg            
 extracting: img/010.jpeg            
file #6:  bad zipfile offset (local header sig):  3858
  (attempting to re-compensate)
file #6:  bad zipfile offset (local header sig):  3858
file #7:  bad zipfile offset (local header sig):  337606
file #8:  bad zipfile offset (lseek):  360448
file #9:  bad zipfile offset (lseek):  385024
file #10:  bad zipfile offset (local header sig):  314850
file #11:  bad zipfile offset (local header sig):  341398
file #12:  bad zipfile offset (lseek):  360448
file #13:  bad zipfile offset (lseek):  393216
 extracting: img/002.jpeg

How to extract the files in terminal without getting an error? And without concatenating the parts, preferably

Upvotes: 2

Views: 6172

Answers (2)

Adrià Arrufat
Adrià Arrufat

Reputation: 471

If you're dealing with huge files, you can use 7zip instead to extract directly without having to combine the parts:

7z x img-pt.zip

That will start extracting right away.

Upvotes: -1

Stefano Borzì
Stefano Borzì

Reputation: 2586

Put all the files .z* and .zip into the same directory and use the following commands:

zip -s- img-pt.zip -O combined.zip
unzip combined.zip

Upvotes: 4

Related Questions