How to Force unrar to Overwrite Existing Files

When extracting RAR archives in automated scripts or standard terminal sessions, the unrar utility prompts for user confirmation whenever it encounters duplicate filenames. This guide explains how to use the -o+ command-line switch to automatically overwrite existing files without interactive prompts, along with practical examples for everyday use.

The Overwrite Switch: -o+

To force unrar to overwrite existing files automatically, append the -o+ switch to your extraction command. The switch is case-sensitive and must be written with the plus sign (+) immediately following the lowercase letter o.

Basic Usage Examples

Extracting with Full Directory Paths (x)

In most cases, you want to preserve the internal folder structure of the archive. Use the x command combined with -o+:

unrar x -o+ archive.rar

Extracting to a Specific Directory

To extract files to a designated folder while overwriting duplicates, specify the destination directory at the end of the command:

unrar x -o+ archive.rar /path/to/destination/

Note: Ensure the destination path ends with a trailing slash (/) so unrar recognizes it as a directory.

Extracting Without Directory Paths (e)

If you want to extract all files into a single flat directory, ignoring any subdirectories inside the archive, use the e command:

unrar e -o+ archive.rar

Key Considerations

• No Space Between Characters: Do not place a space between -o and +. The argument must be supplied as -o+.
• Skipping Files Instead: If you need the opposite behavior—skipping existing files without prompting—use the -o- switch instead.
• Non-Interactive Environments: The -o+ switch is essential for cron jobs, Docker build processes, and bash automation where interactive terminal inputs (standard input) are disabled or unavailable.