Linux – Find out the name of a folder in a root directory inside .zip file

fedoralinuxzip

I'm using Fedora 17 and bash as my shell. I have a specific zip file, which has just one folder in it's root. I.e. upon unpacking the zip file i see the following:

> unzip myzip.zip > ls myzip.zip folderThatWasInsideZip

Supposing you know, that there is only 1 folder packed in the zip file, how do I find out the name of the main folder inside the zip file, without actually unpacking the zip file?

I'm looking for a one-liner, that would enable me to do something like this:

> <command> myzip.zip folderThatWasInsideZip

I know there are ways to list all the files in the zip with less, but that lists all the files in the subdirectories etc. I just want to know the name of the one folder. I know I'm missing something basic..

Best Answer

This command seems to do what you want:

unzip -qql myzip.zip | head -n1 | tr -s ' ' | cut -d' ' -f5-

Or with GNU sed:

unzip -qql myzip.zip | sed -r '1 {s/([ ]+[^ ]+){3}\s+//;q}'

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Macos – Terminal unzip outside default directory

The specific answer to your question is no. The unzip that ships with OS X has no way to change directories in the zip on the fly. One thing to note however, is that zip is not 'creating the directory'. It is part of the archive. A properly created zip archive will not have this issue if you are controlling the creation process:

$ ls -l
total 0
-rw-r--r--  1 bsmith  staff  0 Sep 30 22:01 b
-rw-r--r--  1 bsmith  staff  0 Sep 30 22:01 c
$ zip -r a.zip .
  adding: b (stored 0%)
  adding: c (stored 0%)
$ cd ../b
$ unzip ../a/a.zip
Archive:  ../a/a.zip
 extracting: b                       
 extracting: c                       
$ ls -l
total 0
-rw-r--r--@ 1 bsmith  staff  0 Sep 30 22:01 b
-rw-r--r--@ 1 bsmith  staff  0 Sep 30 22:01 c

Can a ZIP file auto-execute files from inside it

Some thoughts. I agree with you, but can see why a service provider would choose to block .zip files. I can't find too much information on some of these, I will update if I find any more info.

There is such a thing as a zip bomb.
The ZIP file format supports various compression formats - specified as a 16-bit value. Many operating systems would load a library for that method to handle compression and decompression. It doesn't look like a custom one can be specified. Windows .hlp had a vulnerability like this where the .hlp file could contain a custom DLL for display purposes, but it doesn't look like this can be done with .zip.
Windows Explorer will read certain *.ini files (and other ones depending on the Windows version IIRC) and possibly run programs based on them. Windows 98 let you do a lot with this, whereas I believe in later versions it is restricted. I can't find anytihng whether or not a Desktop.ini file in a zip archive will be processed by Explorer if opened. But this could be an attack vector.
Technically ANY file opened by Windows that has a recognized extension launches a program. For .zip files by default that is explorer.exe, but could be another program if the user has installed a different ZIP application. If an attacker knows a user has WinZip, and is aware of a vulnerability of WinZip, the user could be targeted.
SFX zips obviously can be malicious.

Best Answer

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Can a ZIP file auto-execute files from inside it

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