buildkit/frontend/dockerfile/docs/rules/consistent-instruction-casing.md

title, description, aliases

title	description	aliases
ConsistentInstructionCasing	All commands within the Dockerfile should use the same casing (either upper or lower)	/go/dockerfile/rule/consistent-instruction-casing/

Output

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.

From alpine
Run echo hello > /greeting.txt
EntRYpOiNT ["cat", "/greeting.txt"]

✅ Good: all uppercase.

FROM alpine
RUN echo hello > /greeting.txt
ENTRYPOINT ["cat", "/greeting.txt"]

✅ Good: all lowercase.

from alpine
run echo hello > /greeting.txt
entrypoint ["cat", "/greeting.txt"]