bash 命令 XOR ^ anothercommand
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bash command XOR ^ anothercommand
提问by AK_
In the example below:
在下面的例子中：
w ^ ls
what's the expected behaviour of the XOR operator in shell?
shell 中 XOR 运算符的预期行为是什么？
So when we enter
所以当我们进入
command ^ anothercommand
what triggers anothercommandto run (if it will execute at all)?
什么触发器anothercommand运行（如果它会执行）？
回答by choroba
As you can see in man bash, ^is not used to separate commands, it's used inside arithmetic expressions.
正如您在 中所见，man bash,^不用于分隔命令，它用于算术表达式中。
$ echo $(( 5 ^ 9 ))
12
That's because
那是因为
dec bin
5 0101
9 1001
-----------
12 1100
回答by chepner
If you enter command ^ anothercommand, you are simply providing commandwith two arguments, ^and anothercommand. There is no operator here. anothercommandwill only run if commanddecides to treat that argument as a command name and attempt to run it.
如果您输入command ^ anothercommand，您只是提供command了两个参数，^和anothercommand。这里没有操作员。anothercommand只有在command决定将该参数视为命令名称并尝试运行它时才会运行。
