if ${custom} is empty then [: =: unary operator expected

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if ${custom} is empty then [: =: unary operator expected #117

Open demanLiu opened 8 years ago

jwu commented 8 years ago

Hi @demanLiu , thanks for the PR. I can not find any document in bash about when to use [[ and the best practise for it. Would you mind to explain more about it? Thank you again.