Google – Shell Style Guide

Shell Files and Interpreter Invocation	File Extensions SUID/SGID
Environment	STDOUT vs STDERR
Comments	File Header Function Comments Implementation Comments TODO Comments
Formatting	Indentation Line Length and Long Strings Pipelines Loops Case statement Variable expansion Quoting
Features and Bugs	Command Substitution Test, [ and [[ Testing Strings Wildcard Expansion of Filenames Eval Pipes to While
Naming Conventions	Function Names Variable Names Constants and Environment Variable Names Source Filenames Read-only Variables Use Local Variables Function Location main
Calling Commands	Checking Return Values Builtin Commands vs. External Commands
Conclusion

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