CLAUDE_CODE_SHELL_PREFIXI50

Updated October 14, 2026 by Alex Sorokoletov

CLAUDE_CODE_SHELL_PREFIXI50 is a Claude Code environment variable. Removed between v2.1.229 and v2.1.234, so current releases ignore it. It is not in the official reference.

How to set it

For one session, export it in the shell that starts Claude Code:

export CLAUDE_CODE_SHELL_PREFIXI50=<value>
claude

To apply it to every session, add it to the env object of a settings file:

// ~/.claude/settings.json
{
  "env": {
    "CLAUDE_CODE_SHELL_PREFIXI50": "<value>"
  }
}

Related variables

• CLAUDE_CODE_DISABLE_BG_SHELL_PRESSURE_REAP
• CLAUDE_CODE_DISABLE_INLINE_SHELL_RM_PROMPT: Turns off the new prompt that catches a dangerous rm inside an inline bash -c or sh -c script.
• CLAUDE_CODE_DISABLE_WINDOWS_SHELL_LAUNCHER
• CLAUDE_CODE_SHELL: Override shell for Bash tool (must be bash or zsh).
• CLAUDE_CODE_SHELL_PREFIX: Prefix command for shell execution.
• CLAUDE_CODE_SHELL_LAUNCHER_SCRIPT
• BASH_MAX_OUTPUT_LENGTH: Max bash output character length.
• CLAUDE_BASH_MAINTAIN_PROJECT_WORKING_DIR: Maintain consistent working directory across commands.

Frequently asked questions

All variables, searchable: Claude Code environment variables.