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HomeDocsClaude Code CLI 24 Oct 2026
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Upstream edited this page at 24 Oct 2026 23:10 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 24 Oct 2026 23:37 UTC.

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First seen 14 Aug 2026 this site's first read of the page
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255255A file that changed on disk after Claude last read it can still be edited when `old_string` matches the current content exactly and unambiguously and Claude Code can read the file without prompting. Matching against the file's current content keeps this safe, and the result notes that the file carries other changes so Claude re-reads it before edits that depend on surrounding content. In any other case, such as a stale `old_string` or one that matches more than once without `replace_all`, Claude reads the file again before editing.
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257Claude can also edit a file without a separate Read after it views the file with a Bash command such as `cat` or `grep`. Those commands are `cat`, `nl`, `bat`, `batcat`, `head`, `tail`, `sed -n 'X,Yp'`, `grep`, `egrep`, `fgrep`, and `rg`, each run on one file with no pipes or redirects. A search that prints no matches doesn't count as a read, nor does any command outside this list.
257Claude can also edit a file without a separate Read after viewing it with a Bash command such as `cat` or `grep`. Those commands are `cat`, `nl`, `bat`, `batcat`, `head`, `tail`, `sed -n 'X,Yp'`, `grep`, `egrep`, `fgrep`, and `rg`, each run on one file with no pipes or redirects. If the command printed none of the file's text, as when a search matches nothing, the read-before-edit check still applies.
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259259When Claude views a file this way, Claude Code also loads any [subdirectory `CLAUDE.md`](https://code.claude.com/docs/en/memory#how-claude-md-files-load) and [path-scoped rules](https://code.claude.com/docs/en/memory.md#path-specific-rules) that apply to that file. See [Read and Edit permission rules](https://code.claude.com/docs/en/permissions.md#read-and-edit) for which Bash commands your `Read` and `Edit` deny rules cover.
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