tar Command in Linux: Create, Extract, List, Compress Archives

Q: Can I add files to an existing .tar.gz?

Yes with `-r` flag (rebuilds the archive). The team that does incremental backups uses this.

Q: How do I extract a single file from a tar?

`tar -xzf archive.tar.gz path/to/file.txt` extracts just that file.

Q: Why is tar so slow on small files?

Per-file overhead. The team that has many small files uses `tar -czf -` piped to a remote location.

tar command in Linux: tar -czf archive.tar.gz dir/ to create compressed archive, tar -xzf archive.tar.gz to extract, tar -tzf archive.tar.gz to list. Flags per man tar: -c create, -x extract, -t list, -z gzip, -j bzip2, -J xz, -f file, -v verbose, -C directory.

Create an archive
Extract an archive
List contents
Add files to existing archive
Exclude patterns
Streaming (no temp file)
Verify archive
FAQ

Create an archive

# .tar (uncompressed)
tar -cf archive.tar /path/to/dir/

# .tar.gz (gzip compressed)
tar -czf archive.tar.gz /path/to/dir/

# .tar.bz2 (bzip2, better compression)
tar -cjf archive.tar.bz2 /path/to/dir/

# .tar.xz (xz, best compression)
tar -cJf archive.tar.xz /path/to/dir/

The team that uses tar -czf has the standard archive format.

Extract an archive

# Auto-detect format
tar -xf archive.tar.gz

# Specific format
tar -xzf archive.tar.gz
tar -xjf archive.tar.bz2
tar -xJf archive.tar.xz

# To specific directory
tar -xzf archive.tar.gz -C /target/dir/

The team that uses -C /target/ has clean extraction to a specific path.

List contents

tar -tzf archive.tar.gz

The team that lists before extracting has visibility.

Add files to existing archive

tar -rf archive.tar new_file.txt

The team that updates existing archives has incremental backups.

Exclude patterns

tar -czf archive.tar.gz --exclude='*.log' --exclude='.git' /path/to/dir/

The team that excludes noise files (.log, .git, node_modules) has clean archives.

Streaming (no temp file)

# Archive to remote host via ssh
tar -czf - /local/dir/ | ssh user@remote 'cat > /backup/remote.tar.gz'

# Extract from remote
ssh user@remote 'cat /backup/remote.tar.gz' | tar -xzf -

The team that uses streaming has efficient remote backups without intermediate files.

Verify archive

tar -tzf archive.tar.gz > /dev/null && echo "OK" || echo "corrupt"
# Or with W flag (verify writes)
tar -xzvWf archive.tar.gz

The team that verifies archive integrity has confidence.

FAQ

What’s the difference between tar and zip?

tar: Unix-native, often combined with gzip. zip: Windows-friendly, single tool. The team that picks based on portability has the right choice.

Which compression is best?

gzip: fast, decent ratio. bzip2: slower, better ratio. xz: slowest, best ratio. The team that picks based on speed/size tradeoff.

Can I add files to an existing .tar.gz?

Yes with -r flag (rebuilds the archive). The team that does incremental backups uses this.

How do I extract a single file from a tar?

tar -xzf archive.tar.gz path/to/file.txt extracts just that file.

Why is tar so slow on small files?

Per-file overhead. The team that has many small files uses tar -czf - piped to a remote location.

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