178inaba · May 16, 2015 16:36
diff --git a/file0.txt b/file0.txt
 $ [[ 11 -eq 11 -a "bb" = "bb" ]]; echo $?
 -bash: syntax error in conditional expression
 -bash: syntax error near `-a'
diff --git a/file1.txt b/file1.txt
 $ [[ 11 -eq 11 && "bb" = "bb" ]]; echo $?
 0
diff --git a/file2.txt b/file2.txt
 $ [[ 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
	$ [[ 11 -eq 11 -a "bb" = "bb" ]]; echo $?
	-bash: syntax error in conditional expression
	-bash: syntax error near `-a'
	$ [[ 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