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---
title: ConsistentInstructionCasing
description: >-
All commands within the Dockerfile should use the same casing (either upper or lower)
aliases:
- /go/dockerfile/rule/consistent-instruction-casing/
---
## Output
```text
Command 'EntryPoint' should be consistently cased
```
## Description
Instruction keywords should use consistent casing (all lowercase or all
uppercase). Using a case that mixes uppercase and lowercase, such as
`PascalCase` or `snakeCase`, letters result in poor readability.
## Examples
❌ Bad: don't mix uppercase and lowercase.
```dockerfile
From alpine
Run echo hello > /greeting.txt
EntRYpOiNT ["cat", "/greeting.txt"]
```
✅ Good: all uppercase.
```dockerfile
FROM alpine
RUN echo hello > /greeting.txt
ENTRYPOINT ["cat", "/greeting.txt"]
```
✅ Good: all lowercase.
```dockerfile
from alpine
run echo hello > /greeting.txt
entrypoint ["cat", "/greeting.txt"]
```
|
