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unzip then chmod in one command

Posted on 2011-09-10
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Last Modified: 2012-05-12
HI

I have a zip file that I need to unzip, it contains lots of files and takes around 3 hours to unzip. Then i need to issue a recursive chmod 777 against these files, which again takes some time to do.

Is there a smart way to apply the chmod as the files are being unzipped ?

Maybe piping the unzip thru chmod ?...dunno

I was thinking umask ?...But i dont really understand it
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Question by:Molko
7 Comments
 
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by:pilson66
ID: 36516070
I suggest you to use tar+gzip (tar -cfz/-xzf) instead of zip. This will store/restore file/directory permissions.
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Author Comment

by:Molko
ID: 36516071
The zip file is not provided by me....I have no control over it

Thanks
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Expert Comment

by:pilson66
ID: 36516075
I see only way:
unzip bla-bla-bla; chod 777 bla-bla-bla
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Author Comment

by:Molko
ID: 36516080
How does that work ? How are you piping the files to chmod ?
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theodorejsalvo earned 500 total points
ID: 36516092
Here's a good one-liner:

unzip -Z -1 file.zip | xargs chmod 0777

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Basically the -Z -1 causes unzip to list each file on it's own line, then xargs puts them all on one line and passes them to chmod.
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Expert Comment

by:hvillanu
ID: 36517687
hi,
Try this.
unzip file.zip; chmod -R 777

Or in a shell script... myunzip.sh

# ---------------------------------------------------
#Script to unzip and change permissions
#Variables
MYFILE=$1

#go to file location
cd /some/path/where/zip/file/is

#unzip
unzip MYFILE

#changing permissions
chmod -R 777 *

#End Script
#----------------------------------------


To run type this
myunzip.sh myfile


-- hope helps --
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Expert Comment

by:simon3270
ID: 36521903
unzip prints out the names of the files it is extracting, as below:
$ unzip bigfile.zip 
Archive:  bigfile.zip
   creating: dir1/
   creating: dir2/
 extracting: dir1/f1                 
 extracting: dir1/f2                 
 extracting: dir2/f4                 
 extracting: dir2/f3                 
$

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You can read those names and, with a bit of text processing, pick out the names from the above output text and chmod them as they are extracted.  The command below captures that output as unzip runs, and for any lines where the first word ends "ing:", it runs chmod on the file.
unzip bigfile.zip | awk '/ing:/{print $2}' | xargs chmod 777

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As with many commands like this, filenames with special characters (including spaces) will break processing.

If your files might contain spaces, you need a more complex:
unzip bigfile.zip | awk '/ing:/{gsub("^.*ing: ","");gsub(" *$","");printf "%s%c",$0,0}' | xargs -0 chmod 777

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