2023.09.06

"w"  = = > O_WRONLY|O_TRUNC|O_CREAT
"w+" = = > O_RDWR|O_TRUNC|O_CREAT
"r"  = = > O_RDONLY 
"r+" = = > O_RDWR
"a"  = = > O_APPEND|O_WRONLY|O_CREAT
"a+" = = > O_RDWR|O_APPEND|O_CREAT

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