To extract a tar file in Linux, use the following command:
tar -xvf yourfile.tar
where "yourfile.tar" is the name of the file you want to extract.
This command will extract the files into the current directory. If you want to extract the files into a different directory, you can use the -C option to specify the path. For example:
tar -xvf yourfile.tar -C /path/to/extract
This will extract the files into the /path/to/extract directory.
Note: The above commands assume that the tar command line tool is already installed on your system.