O file 如果文件存在并且归该用户所有 ; 则为真 ; 文件属于有效的用户时返回真
o File Size 文件大小
o File Systems 文件系统
o Suppress file output 禁止文件输出
o output file 保存为文件
Ctrl-O Open mission file 打开任务文件
For example, if you were instrumenting a file I/O function, you might add the name of the file being written to the probe for that function.
例如，如果要检查一个文件 I/O 函数，可以把正在写的文件的名称添加到函数的探测中。
youdao
O writes the output to the file specified.
o将输出内容写入指定文件中。
O output file.
o输出文件。
But morale is already low among the rank-and-file and such changes might make it worse for them, O'Donnell said.
WSJ: NYPD street stop policy's critics seek big changes
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