$ [[ 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