5 SC2022

Joachim Ansorg edited this page 2021-11-12 19:18:31 +01:00

Table of Contents

• Note that unlike globs, o* here matches ooo but not oscar.
• Problematic code:
• Correct code:
• Rationale:
• Exceptions

Note that unlike globs, o* here matches ooo but not oscar.

Problematic code:

grep 'foo*'

when wanting to match food and foosball, but not mofo or keyfob.

Correct code:

grep '^foo'

Rationale:

As a glob, foo* means "Any string starting with foo", e.g. food and foosball.

As a regular expression, "foo*" means "f followed by 1 or more o's, anywhere", e.g. "mofo" or "keyfob".

This construct is way more common as a glob than as a regex, so ShellCheck notifies you about it.

Exceptions

If you're aware of the above, you can ignore this message. If you'd like shellcheck to be quiet, use a directive or 'fo[o]*'.

ShellCheck

• Installation

  • CentOS6
  • More Installation Guides

• Usage

  • Directive
  • Ignore

• Integrating and extending

  • Misc. contributions
  • Azure Pipelines
  • Buildkite
  • CircleCI
  • DevGuide
  • Integration
  • JUnit
  • Phabricator
  • TravisCI
  • GitLab CI
  • Drone
  • GitHub Actions

• Severity

• Template

Each individual ShellCheck warning has its own wiki page like SC1000. Use GitHub Wiki's "Pages" feature above to find a specific one, or see Checks.