&&
写法1:if [ $str=a -a $str=b ]
写法2:if [ $str=a ] && [ $str=b ]
||写法1:if [ $str=a -o $str=b ] 写法2:if [ $str=a ] || [ $str=b ]
linux shell中逻辑与,逻辑或语法
原文:https://www.cnblogs.com/liansng/p/12133268.html