3 SC2281

Joachim Ansorg edited this page 2021-11-12 19:59:37 +01:00

Table of Contents

• Don't use $/${} on the left side of assignments.
• Problematic code:
• Correct code:
• Rationale:
• Exceptions

Don't use $/${} on the left side of assignments.

Problematic code:

$greeting="Hello World"
${greeting}="Hello World"

Correct code:

greeting="Hello World"

Alternatively, if the goal was to assign to a variable whose name is in another variable (indirection), use declare:

name=foo
declare "$name=hello world"
echo "$foo"

Or if you actually wanted to compare the value, use a test expression:

if [ "$greeting" = "hello world" ]
then
  echo "Programmer, I presume?"
fi

Rationale:

Unlike Perl or PHP, $ is not used on the left-hand side of = when assigning to a variable.

Exceptions

None

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.