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角括弧2個([[ 条件式 ]])の条件式でAND条件「-a」が使えない件(回避方法あり)

$ [[ 11 -eq 11 -a "bb" = "bb" ]]; echo $?
-bash: syntax error in conditional expression
-bash: syntax error near `-a'

怒られた。

$ [[ 11 -eq 11 && "bb" = "bb" ]]; echo $?
0

&&だといいみたい。

orも

$ [[ 11 -eq 11 -o "bb" = "ab" ]]; echo $?
-bash: syntax error in conditional expression
-bash: syntax error near `-o'

$ [[ 11 -eq 11 || "bb" = "ab" ]]; echo $?
0
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2
Help us understand the problem. What are the problem?