Change Default Text Encoding in Unrar Console

When extracting archives containing filenames from different language sets, console-based unrar can produce garbled characters (mojibake) if the encoding does not match your system environment. This article provides straightforward methods to change and configure the default text encoding in unrar, including using the built-in charset switch, adjusting system environment variables, and setting persistent configuration defaults.

Method 1: Use the `-sc` Switch in the Command Line

The command-line version of RAR/UnRAR includes a built-in character set switch (-sc) to specify the encoding for text operations.

The syntax is:

unrar -sc<charset>[objects] <command> <archive>

Charset Values:

f: UTF-8
a: ANSI (Windows code page)
o: OEM (DOS code page)
u: Unicode (UTF-16)

Object Values:

c: Archive comments
l: List files

Example:

To force unrar to use UTF-8 for reading list files and comments during extraction:

unrar -scfl x archive.rar

Method 2: Configure System Locale Variables (Linux & macOS)

On Unix-based operating systems, unrar relies heavily on standard POSIX locale variables (LANG, LC_CTYPE, or LC_ALL) to determine how text is rendered to the terminal.

Check your current locale:
```
locale
```
Run unrar with an overridden UTF-8 locale:
```
LC_ALL=en_US.UTF-8 unrar x archive.rar
```
Make the encoding permanent: Add the locale configuration to your shell profile (~/.bashrc, ~/.zshrc, or /etc/environment):
```
export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8
```
Apply the changes immediately:
```
source ~/.bashrc
```

Method 3: Change Active Code Page in Windows (CMD / PowerShell)

In Windows, the command prompt defaults to legacy OEM code pages (e.g., CP437). To display and process UTF-8 filenames correctly:

Open the command prompt.
Change the active console code page to UTF-8 using chcp:
```
chcp 65001
```
Run your extraction command:
```
unrar x archive.rar
```

Method 4: Set Persistent Default Parameters via the `RAR` Variable

To avoid typing encoding switches repeatedly, define the RAR environment variable. The unrar binary automatically reads this variable for default switches every time it executes.

On Linux/macOS: Add this line to ~/.bashrc or ~/.profile:
```
export RAR="-scf"
```
On Windows (Command Prompt):
```
setx RAR "-scf"
```

Alternatively, on Linux systems, you can create or edit /etc/rarrc (system-wide) or ~/.rarrc (user-specific) and add default switches:

-scf

Handling Legacy RAR4 Archives with Specific Encodings

Old archives created under RAR4 format do not store Unicode headers and rely on the local OEM/ANSI code page of the operating system where they were created. If unrar fails to translate these filenames properly:

Use unar as an alternative: The unar utility supports an explicit encoding flag (-e):

unar -e GBK archive.rar
unar -e Shift-JIS archive.rar
unar -e CP1251 archive.rar

Fix filenames post-extraction using convmv (Linux):

convmv -f cp936 -t utf-8 --notest -r ./extracted_folder