[root@desktop ~]# diff http://www.example.net/index.PHP http://www.example.com/index.PHP
diff: http://www.example.net/index.PHP: No such file or directory
diff: http://www.example.com/index.PHP: No such file or directory
[root@desktop ~]#

解决方法

diff <(curl url1) <(curl url2)

diff <(curl http://www.example.net/index.PHP) <(curl http://www.example.com/index.PHP)

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