(1)与
if [ $key1=val1 -a $key2=val2 ] if [ $key1=val1 ] && [ $key2=val2 ]
(2)或
if [ $key1=val1 -o $key2=val2 ] if [ $key1=val1 ] || [ $key2=val2 ]
(3)非
if [ ! $key1=val1 ]
(4)xxx
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