On the understanding and experiment of logical operation XOR in Shell programming

Logical operations in shell programming, with or without, short-circuit operations, XOR operations, we use the simplest way to understand the XOR.

XOR: ^
XOR two values, same as false, different for true

Understandably, two values refer to binary values, two 1 or two 0 results are false [0], and two different values result in [1].

For example:

Binary

decimal
10	01010
22	10110
XOR result 28	11100

How does that differ or how does it reflect value in shell programming? The following experiment can be used in temporary variables.

#利用临时变量将a b进行互换值[[email protected] ~]#a=6[[email protected] ~]#b=8[[email protected] ~]#tmp=$a[[email protected] ~]#a=$b[[email protected] ~]#b=$tmp[[email protected] ~]#echo $a $b8 6[[email protected] ~]#b=8[[email protected] ~]#a=6[[email protected] ~]#a=$[a^b]#此时的a^b按照二进制运算，则结果为如下计算结果0110 61000 81110 14[[email protected] ~]#echo $a $b14 8[[email protected] ~]#b=$[a^b]#此时的a^b按照二进制运算，则结果为如下计算结果1110 141000 80110 6[[email protected] ~]#echo $a $b14 6[[email protected] ~]#a=$[a^b]#此时的a^b按照二进制运算，则结果为如下计算结果1110 140110 61000 8[[email protected] ~]#echo $a $b8 6

On the understanding and experiment of logical operation XOR in Shell programming