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HomeDocsClaude Code CLI 1 Oct 2026
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Upstream edited this page at 1 Oct 2026 03:13 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 1 Oct 2026 03:37 UTC.

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300300* Prompt Claude Code to run a command in the background
301301* 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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303When a command reaches its timeout before it finishes, Claude Code automatically [moves it to the background](/docs/en/tools-reference#foreground-commands-that-move-to-the-background) instead of stopping it, unless the command starts with `sleep`. To change how long commands run before that happens, set the [Bash timeout environment variables](/docs/en/tools-reference#timeout-and-output-limits).
303When a command reaches its timeout before it finishes, Claude Code automatically [moves it to the background](/docs/en/tools-reference#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#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#timeout-and-output-limits).
304304 
305305**Key features:**
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315315* Background Bash and PowerShell commands have a time limit, counted from the moment the command enters the background: 30 minutes, or the `timeout` Claude asks for when it starts a command in the background, up to a maximum of 2 hours. A command that moves to the background while it runs, for example with `Ctrl+B`, gets 30 minutes from the move. When a command reaches its limit, Claude Code stops it and tells Claude why, and Claude can start it again with a longer `timeout` if the work still needs it. To lengthen the limits, see [Raise the time limit for background commands](/docs/en/tools-reference#raise-the-time-limit-for-background-commands) in the tools reference
316316* A background command that a foreground [subagent](/docs/en/sub-agents#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#when-a-background-command-stops) in the tools reference
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318To disable all background task functionality, set the `CLAUDE_CODE_DISABLE_BACKGROUND_TASKS` environment variable to `1`. See [Environment variables](/docs/en/env-vars) for details.
318To 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#start-faster-with-bare-mode) turns it off as well.
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320320**Common backgrounded commands:**
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