Working with ZIP archives in Linux

ZIP is one of the most universal archive formats — natively supported on Windows, macOS, Linux, and virtually every device. It compresses files and folders efficiently and is perfect for quick sharing or backups when compatibility matters most.

Important note: ZIP's built-in encryption (especially older versions) is weak by modern standards. For sensitive data, use stronger alternatives like tar + xz or 7z instead.

Installing ZIP and unzip

Ubuntu / Debian:

sudo apt update
sudo apt install zip unzip -y

CentOS / Rocky / AlmaLinux:

sudo yum install zip unzip -y

or (newer versions):

sudo dnf install zip unzip -y

Creating a ZIP archive

Basic command to zip a folder recursively:

zip -r archive.zip folder/

Useful variations:

1. Maximum compression (level 9 — smallest size, takes longer):

   zip -9 -r archive.zip /path/to/folder
   

2. Zip the current directory:

   zip -9 -r archive.zip .
   

3. Exclude files or folders (great for skipping logs, caches, etc.):

   zip -9 -r archive.zip /var/www --exclude="*.log" --exclude="cache/*"
   

4. Password-protect the archive (note: encryption is basic — use only for light protection):

   zip -9 -r --password "StrongPass123" secure.zip important_files/
   

5. Zip multiple folders/files at once:

   zip -9 -r archive.zip folder1 folder2 file.txt
   

Extracting a ZIP archive

1. Extract to current directory:

   unzip archive.zip
   

2. Extract to a specific folder (creates it if missing):

   unzip archive.zip -d /path/to/destination
   

3. Extract only specific files:

   unzip archive.zip important/file.txt
   

4. Extract password-protected archive:

   unzip -P "StrongPass123" archive.zip
   

Viewing archive contents (without extracting)

List files inside:

unzip -l archive.zip

This shows filenames, sizes, dates, and compression ratios — very useful for checking what's inside before extracting.

Handy tips & best practices

• Always include -r when zipping folders — otherwise subdirectories are skipped
• Use -9 for maximum compression when size matters most (but it's slower)
• Add -v for verbose output — see exactly what's being processed
• ZIP struggles with very large files (>4 GB) or deeply nested paths — switch to tar.xz in those cases
• Verify archive integrity after creation: unzip -t archive.zip