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HomeDocsClaude Code CLI 23 Oct 2026
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Nearest release: v2.1.310, published 4 hours after upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 23 Oct 2026 16:44 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 23 Oct 2026 17:07 UTC.

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313313* Prompt Claude Code to run a command in the background
314314* Press `Ctrl+B` to move a regular Bash tool invocation to the background. Tmux users must press `Ctrl+B` twice due to tmux's prefix key.
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316When a command reaches its timeout before it finishes, Claude Code automatically [moves it to the background](/docs/en/tools-reference.md#foreground-commands-that-move-to-the-background) instead of stopping it, unless the command starts with `sleep`. If you've turned background tasks off with [`CLAUDE_CODE_DISABLE_BACKGROUND_TASKS`](/docs/en/env-vars#variables) or by starting in [bare mode](/docs/en/headless.md#start-faster-with-bare-mode), the command stops at its timeout. To change the timeout, set the [Bash timeout environment variables](/docs/en/tools-reference.md#timeout-and-output-limits).
316When a command reaches its timeout before it finishes, Claude Code automatically [moves it to the background](/docs/en/tools-reference.md#foreground-commands-that-move-to-the-background) instead of stopping it, unless the command starts with `sleep`. If you've turned background commands off with [`CLAUDE_CODE_DISABLE_BACKGROUND_TASKS`](/docs/en/env-vars#variables) or by starting in [bare mode](/docs/en/headless.md#start-faster-with-bare-mode), the command stops at its timeout. To change the timeout, set the [Bash timeout environment variables](/docs/en/tools-reference.md#timeout-and-output-limits).
317317 
318318**Key features:**
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328328* Background commands in a local session you work in from a terminal, the desktop app, or the VS Code extension have no time limit. In a session that runs unattended, such as a `-p` run or a cloud session, Claude Code stops a background command at its [time limit](/docs/en/tools-reference.md#time-limit-for-background-commands)
329329* A background command that a foreground [subagent](/docs/en/sub-agents.md#run-subagents-in-foreground-or-background) started ends when that subagent's run ends, whether it finished, failed, or was interrupted; see [When a background command stops](/docs/en/tools-reference.md#when-a-background-command-stops) in the tools reference
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331To disable all background task functionality, set the [`CLAUDE_CODE_DISABLE_BACKGROUND_TASKS`](/docs/en/env-vars#variables) environment variable to `1`. Starting in [bare mode](/docs/en/headless.md#start-faster-with-bare-mode) turns it off as well.
331To turn off background commands, set the [`CLAUDE_CODE_DISABLE_BACKGROUND_TASKS`](/docs/en/env-vars#variables) environment variable to `1`. With it set, you also lose background subagents, background forked skills, and `Ctrl+B`. Starting in [bare mode](/docs/en/headless.md#start-faster-with-bare-mode) has the same effect.
332332 
333333**Common backgrounded commands:**
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