SC2250 – ShellCheck Wiki

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Prefer putting braces around variable references even when not strictly required.

This is an optional suggestion. It must be explicitly enabled with a directive enable=require-variable-braces in a # shellcheck comment or .shellcheckrc

Problematic code:

partial_path='example'

curl "http://example.com/$partial_path_version/explain.html"

Correct code:

partial_path='example'

curl "http://example.com/${partial_path}_version/explain.html"

Rationale:

If a variable gets called, and there is a string that gets appended to the variable that could get misinterpreted as possibly part of the name of the variable. Then it will not call the right variable.

Related resources:

• StackOverflow: How do we separate variables from letters in shell scripting

ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.