yu81 · August 29, 2015 14:18
diff --git a/file0.sh b/file0.sh
 $ [ a = b ] && echo true || echo false
 false
 $ [ a == a ] && echo true || echo false
 true
diff --git a/file0.txt b/file0.txt
 $ [ a = b ] && echo true || echo false
 false
 $ [ a == a ] && echo true || echo false
 true
diff --git a/file1.sh b/file1.sh
 $ [ a = b ] && echo true || echo false
 false
 $ [ a == a ] && echo true || echo false
 [: 4: a: unexpected operator
 false
diff --git a/file1.txt b/file1.txt
 $ [ a = b ] && echo true || echo false
 false
 $ [ a == a ] && echo true || echo false
 [: 4: a: unexpected operator
 false
	$ [ a = b ] && echo true \|\| echo false
	false
	$ [ a == a ] && echo true \|\| echo false
	true