远程服务器工作时只能用用diff命令，记下几条好用的：
并排格式输出：diff hello.c hello_diff.c -y -W 130
上下文输出格式：diff hello.c hello_diff.c -c
统一输出格式：diff hello.c hello_diff.c -u
忽略模式行：diff hello.c hello_diff.c -I include
Using process substitution to compare the contents of two directories
(to see which filenames are in one, but not the other)
diff <(ls $first_directory) <(ls $second_directory)
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