Metadata

ID: bash-code-quality/missing-shebang

Language: Bash

Severity: Notice

Category: Code Style

Description

Without #! on line one, a script run directly is executed by whatever /bin/sh points to (often dash or ash), not necessarily Bash. Bash-only syntax can then fail in confusing ways or behave differently than on your interactive shell. Put a valid interpreter line first, for example #!/usr/bin/env bash or an absolute path like #!/bin/bash, matching what you actually need.

Non-Compliant Code Examples

# not a shebang
echo "if this were line 1 there would still be no interpreter path after #!"
true

Compliant Code Examples

#!/bin/bash
echo ok

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