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-rw-r--r--Documentation/CodingGuidelines4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/CodingGuidelines b/Documentation/CodingGuidelines
index b8bf618a30..8346c1972b 100644
--- a/Documentation/CodingGuidelines
+++ b/Documentation/CodingGuidelines
@@ -43,6 +43,10 @@ For shell scripts specifically (not exhaustive):
- We use Arithmetic Expansion $(( ... )).
+ - Inside Arithmetic Expansion, spell shell variables with $ in front
+ of them, as some shells do not grok $((x)) while accepting $(($x))
+ just fine (e.g. dash older than 0.5.4).
+
- No "Substring Expansion" ${parameter:offset:length}.
- No shell arrays.