unzip a list of urls from txt file

this is my code I read the urls from a txt file but now I need to unzip them all
when I unzip them I always get the same error 
could anyone please show me the code of doing that thanks.

 file = input('Enter file name: ','s'); % prompt the user to enter file name
str= fileread(file);
% a pattern for reading urls
C = regexpi(str, ...
    ['((http|https|ftp|file)://|www\.|ftp\.)',...
    '[-A-Z0-9+&@#/%=~_|$?!:,.]*[A-Z0-9+&@#/%=~_|$]'], 'match');
C{:};
for k = 1:numel(C)
element=C(k);
% disp(C(k));
unzip(element,'MATLAB');
end

the error is: Error using exist The first input to exist must be a string scalar or character vector.

Error in parseUnArchiveInputs (line 74) if exist(archiveFilename,'dir') && ~isempty(dir(archiveFilename))

Error in unzip (line 57) [zipFilename, outputDir, url, urlFilename] = parseUnArchiveInputs( ...

Error in project2 (line 17) unzip(element,'MATLAB');

Answer 1

[Jan]

The line

C{:};

performs nothing. Delete it.

unzip needs a file name as char vector as first input, but element=C(k) creates a scalar cell string. Use this instead:

element = C{k};  % Curly braces

By the way, I'm not sure if "unzipping an URL" is a meaningful task. It depends on the contents of the data.

[Jan]

[MOVED from section for answers] Reema Alhassan wrote:

thanks a lot it works... but how can I know if the files unzipping now ? when I check the folder there are no files it's empty but the program still running do you think because the size of the file is large? btw the urls is zipped geoimagees check this link out https://data.ngdc.noaa.gov/instruments/remote-sensing/passive/spectrometers-radiometers/imaging/viirs/dnb_composites/v10//201612/vcmcfg/SVDNB_npp_20161201-20161231_75N060W_vcmcfg_v10_c201701271136.tgz

thanks

[Jan]

@Reema Alhassan: Please post comments in the section for comments. Thanks.

Do you provide the URL as input to unzip or did you download the file and call unzip afterwards? Matlab's unzip is a java implementation. I assume calling e.g. 7zip will be much faster. And I'm not sure if unzip works at all for tar-gnuzip files. Did you test this?

[Reema Alhassan]

I have tried gunzip with untar together and and it is working thanks a lot ..