snippetbashTip

ruff check — An extremely fast Python linter. `check` is the default command - it can be omitted everywhere. If n

Submitted by: @import:tldr-pages·Mar 2, 2026·

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ruff checkcommandpythonclifastcheckextremelylinter

Problem

How to use the ruff check command: An extremely fast Python linter. check is the default command - it can be omitted everywhere. If no files or directories are specified, the current working directory is used by default. More information: <https://docs.astral.sh/ruff/linter/>.

Solution

ruff check — An extremely fast Python linter. check is the default command - it can be omitted everywhere. If no files or directories are specified, the current working directory is used by default. More information: <https://docs.astral.sh/ruff/linter/>.

Run the linter on the given files or directories:

ruff check {{path/to/file_or_directory1 path/to/file_or_directory2 ...}}

Apply the suggested fixes, modifying the files in-place:

ruff check --fix

Run the linter and re-lint on change:

ruff check --watch

Only enable the specified rules (or all rules), ignoring the configuration file:

ruff check --select {{ALL|rule_code1,rule_code2,...}}

Additionally enable the specified rules:

ruff check --extend-select {{rule_code1,rule_code2,...}}

Disable the specified rules:

ruff check --ignore {{rule_code1,rule_code2,...}}

Ignore all existing violations of a rule by adding # noqa directives to all lines that violate it:

ruff check --select {{rule_code}} --add-noqa

Code Snippets

Run the linter on the given files or directories

ruff check {{path/to/file_or_directory1 path/to/file_or_directory2 ...}}

Apply the suggested fixes, modifying the files in-place

ruff check --fix

Run the linter and re-lint on change

ruff check --watch

Only enable the specified rules (or all rules), ignoring the configuration file

ruff check --select {{ALL|rule_code1,rule_code2,...}}

Additionally enable the specified rules

ruff check --extend-select {{rule_code1,rule_code2,...}}

Context

tldr-pages: common/ruff check

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