Conditions read =~ and $(( )) as the walk does; bash's integers at start (refactor 3.2, S2) - #242

Conditions read =~ and $(( )) as the walk does; bash's integers at start (refactor 3.2, S2)#242

sf624 merged 6 commits into

refactor/3.2-treessf624/bash-explainer:refactor/3.2-treesfrom

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