Why Linux Prefers tar.gz Over ZIP and 7Z

tar.gz is not just a compression format; it combines tar for packaging multiple files into one archive and gzip for compressing that archive. This two‑step design embodies the Unix principle of "do one thing and do it well," where each tool excels at its specific task.

ZIP, while popular on Windows, discards Unix file‑system attributes such as ownership, permission bits, and timestamps when creating an archive. The author recounts a case where a colleague sent a ZIP file for an embedded Linux board; after extraction, all scripts lost their executable bits, forcing a manual chmod +x on each file.

Another drawback of ZIP is compatibility. Most Linux distributions ship tar and gzip by default, whereas unzip may be absent on minimal or embedded systems. Additionally, ZIP’s compression ratio is generally inferior to gzip, bzip2, or xz.

7Z provides higher compression ratios, but it introduces new problems: the p7zip package must be installed first, and both compression and decompression are slower—an issue for multi‑gigabyte logs or source trees. Moreover, 7Z has never become a standard tool in the Linux ecosystem, so sending a 7Z archive forces recipients to install additional software.

Beyond technical factors, ecosystem habit plays a decisive role. The majority of open‑source projects on GitHub distribute source code as tar.gz or tar.xz. Documentation, tutorials, and scripts are written around the tar command, creating a strong convention that minimizes communication overhead.

The flexibility of tar further reinforces its dominance. Users can choose different compressors ( tar -czf for gzip, tar -cjf for bzip2, tar -cJf for xz), exclude files, archive specific directories, or pipe the output directly to a remote host. For example, the author uses a one‑liner to stream a root‑filesystem to a target board:

tar -czf - rootfs/ | ssh user@target "cd /tmp && tar -xzf -"

This single command packs locally, transfers via SSH, and extracts remotely, whereas achieving the same with ZIP or 7Z would require multiple steps and temporary files.

tar.gz is not without flaws. Its compression ratio is lower than 7Z, and extracting requires remembering the correct flag ( -xzf, -xjf, or -xJf), which can confuse newcomers. However, seasoned Linux users treat these flags as muscle memory. Modern versions of tar also support auto‑detection ( tar -xf), simplifying extraction regardless of the underlying compression.

In summary, Linux adopts tar.gz because it aligns with Unix philosophy, retains essential file‑system metadata, enjoys universal availability, benefits from a mature ecosystem, and offers versatile usage patterns. Its prevalence is a path‑dependent standard rather than a claim that other formats are technically impossible.