index b8bf618a30fd32a014e41e1ba9914f5e652bdefd..46f8a3fab13f71623ef6dbc4239067e8daa9dc59 100644 (file)
For shell scripts specifically (not exhaustive):
+ - We use tabs for indentation.
+
+ - Case arms are indented at the same depth as case and esac lines.
+
- We prefer $( ... ) for command substitution; unlike ``, it
properly nests. It should have been the way Bourne spelled
it from day one, but unfortunately isn't.
- - We use ${parameter-word} and its [-=?+] siblings, and their
- colon'ed "unset or null" form.
+ - We use POSIX compliant parameter substitutions and avoid bashisms;
+ namely:
- - We use ${parameter#word} and its [#%] siblings, and their
- doubled "longest matching" form.
+ - We use ${parameter-word} and its [-=?+] siblings, and their
+ colon'ed "unset or null" form.
- - We use Arithmetic Expansion $(( ... )).
+ - We use ${parameter#word} and its [#%] siblings, and their
+ doubled "longest matching" form.
- - No "Substring Expansion" ${parameter:offset:length}.
+ - No "Substring Expansion" ${parameter:offset:length}.
- - No shell arrays.
+ - No shell arrays.
- - No strlen ${#parameter}.
+ - No strlen ${#parameter}.
+
+ - No pattern replacement ${parameter/pattern/string}.
+
+ - We use Arithmetic Expansion $(( ... )).
- - No regexp ${parameter/pattern/string}.
+ - 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).
- We do not use Process Substitution <(list) or >(list).