raw
time
threadtime
long
-c clear (flush) the entire log and exit
清除所有 log 并退出
-d dump the log and then exit (don't block)
得到所有log并退出且不阻塞
-t <count> print only the most recent <count> lines (implies -d)
仅打印最近的由参数 count 指出的行数(必然包含 -d)
-g get the size of the log's ring buffer and exit
得到环形缓冲区的大小并退出
-b <buffer> Request alternate ring buffer, 'main', 'system', 'radio' or 'events'.
Multiple -b parameters are allowed and the results are interleaved.
The default is -b main -b system.
请求供替换的环形缓冲区，如：main，system，radio，events。
多个 -b 参数是被允许，并且结果是交错输出的。
-b main -b system 是默认的。
-B output the log in binary
输出 log 到二进制文件中。
filterspecs are a series of <tag>[:priority]
过滤说明是一系列 <tag>[:priority]
