命令的逻辑运算
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[root@localhost ~]# echo "l love you" ; echo "i fell in love"
l love you
i fell in love
[root@localhost ~]# echo "i love you" || echo "i fell in love"
i love you
[root@localhost ~]# echo "i love you" && echo "i fell in love"
i love you
i fell in love
[root@localhost ~]# echo "my name is weihongrao" && (echo "i love you" || echo "i fell in love")
my name is weihongrao
i love you
l love you
i fell in love
[root@localhost ~]# echo "i love you" || echo "i fell in love"
i love you
[root@localhost ~]# echo "i love you" && echo "i fell in love"
i love you
i fell in love
[root@localhost ~]# echo "my name is weihongrao" && (echo "i love you" || echo "i fell in love")
my name is weihongrao
i love you
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