CompTIA Linux+ XK0-006 (V8) Practice Question

The required tar invocation must:

• Use -c to create the archive.
• Use -v so each processed file name is shown.
• Use -z to apply gzip compression.
• Use -f immediately followed by the desired archive file name.
• Use --listed-incremental=/var/lib/backup/www.snar (or its short form -g /var/lib/backup/www.snar) so that only files that have changed since the previous run are included and deletions are tracked.

The command tar -cvzf /backups/www-$(date +%F).tar.gz --listed-incremental=/var/lib/backup/www.snar /srv/www satisfies every one of these requirements.

Each alternative fails at least one point:

• A command that substitutes -j for -z compresses with bzip2, not gzip.
• A command that tries --incremental=/var/lib/backup/www.snar both supplies an unsupported argument to --incremental and omits -v, so file names would not be displayed.
• A command that relies on -N /var/lib/backup/www.snar merely compares timestamps; it does not use the snapshot file for true incremental tracking and would ignore deletions.