tgz


Create a .tar file with different compression methods

The following commands will create .tar archives  and compress them using the different methods that are available. We provide multiple solutions, each one for a different type of .tar archive depending on the compression method that is desired.

For .tar archives

tar -c -f archive.tar $FILES_TO_ARCHIVE;

For .tar.bz2 archives

tar -c -j -f archive.tar.bz2 $FILES_TO_ARCHIVE;

For .tar.xz archives

tar -c -J -f archive.tar.xz $FILES_TO_ARCHIVE;

For .tar.gz and .tgz archives

tar -c -z -f archive.tar.gz $FILES_TO_ARCHIVE;

tar Parameters Legend

  • -z or --gzip instructs tar to filter the archive through gzip
  • -j or --bzip2 filters the archive through bzip2
  • -J or --xz filters the archive through xz
  • -f or --file=OUTPUT uses the archive file OUTPUT
  • -c or --create a new archive

Bonus Example: Create a tar.xz archive using the current date in the archive name

The following command will create an archive out of the folders Folder1 and Folder2 and then it will compress it to the .tar.xz format.
The filename of the archive will contain the current date in the format YYYY-MM-DD.

tar -c -J  -f archive.`date +%F`.tar.xz Folder1 Folder2;

The above command will result in something similar to:

archive.2017-06-04.tar.xz
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How to search for specific filenames in .tar archives

The following commands will search in the .tar archives found in the specified folder and print on screen all files that their paths or filenames match our search token. We provide multiple solutions, each one for a different type of .tar archive depending on the compression used.

For .tar archives

find /media/repository/packages/ -type f -iname "*.tar" -exec tar -t -f '{}' \; | grep "configurations/arm-cortexa9";

For .tar.bz2 archives

find /media/repository/packages/ -type f -iname "*.tar.bz2" -exec tar -t -j -f '{}' \; | grep "configurations/arm-cortexa9";

For .tar.xz archives

find /media/repository/packages/ -type f -iname "*.tar.xz" -exec tar -t -J -f '{}' \; | grep "configurations/arm-cortexa9";

For .tar.gz and .tgz archives

Please note that this commands uses the -o (which is the logical or) parameter on find to search for multiple filename extensions.

find /media/repository/packages/ -type f \( -iname "*.tar.gz" -o -iname "*.tgz" \) -exec tar -t -z -f '{}' \; | grep "configurations/arm-cortexa9";

find Parameters Legend

  • -type f filters out any result which is not a regular file
  • -exec command '{}' \; runs the specified command on the results of find. The string '{}' is replaced by the current file name being processed.
  • -o is the logical Or operator. The second expression  is not evaluated if the first expression is true.

tar Parameters Legend

  • -z or --gzip instructs tar to filter the archive through gzip
  • -j or --bzip2 filters the archive through bzip2
  • -J or --xz filters the archive through xz
  • -t or --list lists the contents of an archive
  • -f or --file=INPUT uses the archive file or device named INPUT

Using .tgz files 1

Create

To create a .tgz file, we used tar with the following parameters -czf:

  • -c or --create will create a new archive.
  • -z– or --gzip or --gunzip or --ungzip will filter the archive through gzip and compress it.
  • -f or --file=ARCHIVE will use archive file or device ARCHIVE. If this option is not given, tar will first examine the environment variable TAPE. If it is set, its value will be used as the archive name. Otherwise, tar will assume the compiled-in default.

Example:

tar -czf $ARCHIVE_FILE_NAME.tgz $PATH_TO_COMPRESS;

Please note that the order of the parameters will not change the result.

Extract

To extract a .tgz or .tar.gz file using tar we used the following parameters -xzf:

  • -x or --extract --get will extract the files from the archive. Arguments are optional. When given, they specify names of the archive members to be extracted.
  • -z– or --gzip or --gunzip or --ungzip will filter the archive through gzip and decompress it.
  • -f or --file=ARCHIVE will use archive file or device ARCHIVE. If this option is not given, tar will first examine the environment variable TAPE. If it is set, its value will be used as the archive name. Otherwise, tar will assume the compiled-in default.

Example:

tar -xzf $ARCHIVE_FILE_NAME.tgz;