A system administrator needs to create a compressed backup of the /var/log directory. Which command should they use to create a gzip-compressed archive file named log_backup.tar.gz?
tar -cvf log_backup.tar.gz /var/log
tar -czvf log_backup.tar.gz /var/log
tar -xvf log_backup.tar.gz /var/log
tar -tzvf log_backup.tar.gz /var/log
The correct answer is tar -czvf log_backup.tar.gz /var/log because the options -c create a new archive, -z filter the archive through gzip for compression, -v produce verbose output, showing all processed files, and -f specify the filename of the archive. The incorrect options either do not specify gzip compression, which is required to produce a .gz file, or use options that perform actions other than creating an archive, such as extracting files or listing the contents of an archive.
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