CODEWITHSUNDEEP
linuxbash
Slava
Slava

Reputation: 23

Bash script check if zip file is empty

I am rather inexperienced in linux, I have to check in bash script if some zip file is empty - i.e zip contains no files. I found this code:

if ! zipinfo ${filetotransfer} | tail -n 1 | grep '^0 ' >/dev/null ; then # we have empty zip file!
   echo " zip empty"
   rm $filetotransfer
   exit 0
fi

But it removes file both if zip is empty or not. Is there any way to check it?

Upvotes: 1

Views: 3032

Answers (2)

YOU
YOU

Reputation: 123821

You can just check file size is 22 with stat or md5sum or zip header

# by checking file size
% stat -f%z a.zip 
22

% xxd a.zip
0000000: 504b 0506 0000 0000 0000 0000 0000 0000  PK..............
0000010: 0000 0000 0000                           ......

# with md5sum
$ md5sum a.zip
76cdb2bad9582d23c1f6f4d868218d6c  a.zip

# or by checking zip header
% [ `head -n22 a.zip | tr -d '\0-\6'` = "PK" ] && echo 1
1

Upvotes: 3

slitvinov
slitvinov

Reputation: 5768

You can check the error status of zipinfo -t

f=test.zip
if zipinfo -t "$f" > /dev/null
then
    echo "not empy"
else
    echo "empty"
fi

Upvotes: 1

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