a="a" b="a" if [ $a = $b ] then echo "=" else echo "!=" fi #-z 检查str1的长度是否为0 if [ -z $a ] then echo "zero" else echo "not zero" fi #-n 检查str1的长度是否非0,注意需加"" c="" if [ -n "$c" ] then echo "not zero" else echo "zero" fi = not zero zero
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