Tar command in Linux – A complete learning

Tar command in Linux – A complete guide

Tar command in Linux

Tar command in Linux – to create backup in linux

Introduction

When it comes to creating backups, packaging software source code for distribution, and managing files in Linux, the tar command is no doubt one of the widely used archiving utilities. Tar command which is abbreviated as tape archive is used to group files into archives called tarballs and also compress files using popular compression algorithms such as gzip, bzip2, and xz.

This notes provides  comprehensive information for the tar command, covering commonly used options and examples.

Common Options

The table below lists the most common options you can use with the tar command to perform different operations.

Options A brief description
-A Append the archive to the end of another archive.
-c Create a new archive. Directories are archived recursively, unless the –no-recursion option is given.
-d Find differences between the archive and the file system.
–delete This option has no short form, it deletes specified members from an archive.
-r Same as the -A options. It appends files to the end of an archive.
-t List the contents of an archive.
-u Append files that are newer than the corresponding copy in the archive.
-x Extract files from an archive.
-? or –help Display a short option summary and exit.
-k Don’t replace existing files when extracting.
-O Extract files to standard output.
-f the filename of the archive.
-v Verbosely list files processed.
-z Compress files with gzip.
-j Compress files with bzip2.
-J Compress files with xz.
-Z Compress files with compress.
-a Use the archive suffix/extension to determine the compression program.
-l Used to check for symbolic links when creating archives.
-C Change to the specified directory before permitting any operations
-W Used with -c option to verify any data errors.
–exclude=FILE Exclude the FILE when adding to the tar archive or extracting from a tar archive.
-P Preserves leading slashes from file names when creating archives.
-p Preserve archived file permissions during extraction.
–wildcards Enables the tar command to interpret wildcards.
-m Instructs tar to update the modification time of the extracted files to the current time.
-N Only archive files newer than the specified date.
–remove-files This deletes the original files from the disk after archiving them.
–strip-components Strips the specified number of leading components from file names during extraction.
–to-command Pipe extracted files to a command for further processing.
–listed-incremental Used to handle new GNU-format incremental backups.
–ignore-zeros Ignore zeroed blocks in the archive, which are normally treated as end-of-file (EOF) markers. Tar will stop reading after encountering 2 consecutive EOF (512-blocks filled with zeroes).
–no-recursion Avoid descending automatically in directories.
–one-file-system Instructs tar to stay in local file system when creating archive.

Linux tar Command Operations

Now let’s take a look at some common operations you can do with the tar command.

Create an archive / Create Backup using Tar command in Linux

The -c option can be used to combine multiple files into an archive called a tarball. The -f option is used to specify the archive file name.

Here is an example of creating archives using the tar command:

$ tar -cf archive.tar file1 file2

Compress an archive

Compressing is different from creating an archive in the sense that archiving uses the same amount of disk space as all the individual files and directories combined, whilst compression reduces the size. The option for compressing files depends on the type of algorithm you want to use. To create and compress an archive using gzip use the -z option:

$ tar -czf archive.tar.gz file1 file2

Extract from an archive / backup using tar command in linux

The -x option can be used for extracting or uncompressing archives. Here is an example of extracting an archive in the current working directory:

$ tar -xf archive.tar

If you want to extract an archive to a specific directory use the -C option followed by the directory where you want the files to be extracted:

$ tar -xf archive.tar -C directory-path
 Concatenate multiple archives 
$ tar -Af archive.tar archive2.tar

Append files to archive / backup using Tar command in linux

Tar command gives you the ability to add more files to an already existing archive without having to extract and archive the files again. To append files to an archive use the -a option or -r option:

$ tar -rf archive.tar file_to_append
$ tar -af archive.tar file_to_append

List archive contents

The -t option can be used to list the contents of an archive. This option is very handy if you just want to have a peek at a large archive without extracting it:

$ tar -tf archive.tar
for  further reading on Tar command in Linux ::

https://www.redhat.com/sysadmin/taming-tar-command

https://www.redhat.com/en/technologies/linux-platforms/enterprise-linux

https://medium.com/@acparas/the-tar-command-9338c6401ee8

http://newsvoop.com

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