Bash – Copy a File From One Zip to Another

bashfile managementlinuxscriptingzip

I have a file named 'sourceZip.zip'

This file ('sourceZip.zip') contains two files:

'textFile.txt'

'binFile.bin'

I also have a file named 'targetZip.zip'

This file ('targetZip.zip') contains one file:

'jpgFile.jpg'

In linux, what bash command shall I use to copy both files ('textFile.txt', 'binFile.bin') from the source archive ('sourceZip.zip') straight into the second archive ('targetZip.zip'), so that at the end of the process, the second archive ('targetZip.zip') will include all three files?

(ideally, this would be done in one command, using 'zip' or 'unzip')

Best Answer

Using the usual command-line zip tool, I don't think you can avoid separate extraction and update commands.

source_zip=$PWD/sourceZip.zip
target_zip=$PWD/targetZip.zip
temp_dir=$(mktemp -dt)
( cd "$temp_dir"
  unzip "$source_zip"
  zip -g "$targetZip" .
  # or if you want just the two files: zip -g "$targetZip" textFile.txt binFile.bin
)
rm -rf "$temp_dir"

There are other languages with more convenient zip file manipulation libraries. For example, Perl with Archive::Zip. Error checking omitted.

use Archive::Zip;
my $source_zip = Archive::Zip->new("sourceZip.zip");
my $target_zip = Archive::Zip->new("targetZip.zip");
for my $member ($source_zip->members()) {
          # or (map {$source_zip->memberNamed($_)} ("textFile.txt", "binFile.bin"))
    $target_zip->addMember($member);
}
$target_zip->overwrite();

Another way is to mount the zip files as directories. Mounting either of the zip files is enough, you can use zip or unzip on the other side. Avfs provides read-only support for many archive formats.

mountavfs
target_zip=$PWD/targetZip.zip
(cd "$HOME/.avfs$PWD/sourceZip.zip#" &&
 zip -g "$target_zip" .)  # or list the files, as above
umountavfs

Fuse-zip provides read-write access to zip archives, so you can copy the files with cp.

source_dir=$(mktemp -dt)
target_dir=$(mktemp -dt)
fuse-zip sourceZip.zip "$source_dir"
fuse-zip targetZip.zip "$target_dir"
cp -Rp "$source_dir/." "$target_dir" # or list the files, as above
fusermount -u "$source_dir"
fusermount -u "$target_dir"
rmdir "$source_dir" "$target_dir"

Warning: I typed these scripts directly in my browser. Use at your own risk.

Related Solutions

Extracting Nested Zip Files – Methods and Tools

This will extract all the zip files into the current directory, excluding any zipfiles contained within them.

find . -type f -name '*.zip' -exec unzip -- '{}' -x '*.zip' \;

Although this extracts the contents to the current directory, not all files will end up strictly in this directory since the contents may include subdirectories.

If you actually wanted all the files strictly in the current directory, you can run

find . -type f -mindepth 2 -exec mv -- '{}' . \;

Note: this will clobber files if there are two with the same name in different directories.

If you want to recursively extract all the zip files and the zips contained within, the following extracts all the zip files in the current directory and all the zips contained within them to the current directory.

while [ "`find . -type f -name '*.zip' | wc -l`" -gt 0 ]
do
    find . -type f -name "*.zip" -exec unzip -- '{}' \; -exec rm -- '{}' \;
done

Zip – Create Directory If Zip Archive Contains Several Files

I would do something like this (zsh syntax):

unz() (
  tmp=$(TMPDIR=. mktemp -d -- ${${argv[-1]:t:r}%.tar}.XXXXXX) || exit
  print -r >&2 "Extracting in $tmp"
  cd -- $tmp || exit
  [[ $argv[-1] = /* ]] || argv[-1]=../$argv[-1]
  (set -x; "$@"); ret=$?
  files=(*(ND[1,2]))
  case $#files in
    (0) print -r >&2 "No file created"
        rmdir -v "../$tmp";;
    (1) mv -v -- $files .. && rmdir -v ../$tmp;;
    (*) mv -vT ../$tmp ../$tmp:r;;
  esac && exit $ret
)

That is:

create a directory in anycase
run the command
depending on how many files the command generated:
- remove that directory (if it didn't create any file)
- if it created only one file/dir, move it one level up and discard our directory
- otherwise, attempt to strip the random string from the end of our temp directory.

This way, you can do:

unz unzip foo.zip
unz tar xf foo.tar.gz

It assumes that the last argument to the extracting command is the file to extract. It also assumes GNU tools for the -v options. On non-GNU systems, you can remove those and possibly do the logging by hand. mv -T is also GNU specific, and is to force mv to attempt do a rename only.

Best Answer

Related Solutions

Extracting Nested Zip Files – Methods and Tools

Zip – Create Directory If Zip Archive Contains Several Files

Related Question