Difference Between Unrar t and v Commands

The command-line tool unrar provides distinct commands to inspect and verify archives without extracting files to your storage drive. While both unrar t and unrar v interact with an archive without saving files to the disk, they serve entirely different purposes: unrar t tests the archive for corruption by decompressing the data in memory and validating checksums, whereas unrar v provides a verbose list of the files inside the archive along with their technical metadata.

The unrar t Command: Test Archive

The t command stands for Test. It is used to verify the integrity of the files contained within a RAR archive.

• Function: When you run unrar t archive.rar, the program reads the archive and decompresses the data in memory.
• Integrity Checking: It computes the checksum (CRC32 or BLAKE2) of the decompressed data and compares it against the checksum stored in the archive headers.
• Disk Usage: No files are written to the disk during this process.
• Performance: It takes longer to complete than listing commands because the entire data payload must be processed and decoded.
• Use Case: Determining whether an archive is damaged, incomplete, or corrupted before attempting a full extraction.

If the archive is intact, the command ends with a confirmation message (such as "All OK"). If any file is corrupt, it flags the specific file with a checksum error.

The unrar v Command: Verbosely List Archive

The v command stands for Verbosely list. It is an informational tool used to inspect what is stored inside the archive.

• Function: When you run unrar v archive.rar, the program reads only the headers of the archive.
• Information Displayed: It prints a detailed table to the terminal, including:
  • File paths and file names
  • Original (uncompressed) file size
  • Compressed (packed) file size
  • Compression ratio
  • Date and time of last modification
  • File attributes and permissions
  • Stored CRC checksum
  • Host operating system
• Integrity Checking: It does not decompress the file data or verify that the archive content is uncorrupted. It only confirms that the archive headers are readable.
• Performance: Extremely fast, as it does not unpack or process compressed streams.
• Use Case: Checking the contents, directory structure, or compression details of an archive without extracting it.

Key Differences

In summary, use unrar t when you need to know if an archive is fully functional and free of data corruption, and use unrar v when you simply need to see what files are inside and inspect their metadata.