Detailed explanation of the adb logcat command for android development under DOS Detailed explanation of the adb logcat command for android development under DOS

Detailed explanation of adb logcat command under DOS for android development

Reference URL: https://blog.csdn.net/joshua_love/article/details/52785729

adb logcat -v time > filename.txt Save the log log in a txt file under dos.

adb logcat --help  can display the help letter of the command.

adb logcat command format  : adb logcat [options] [filter items], where options and filter items are in brackets [], indicating that this is optional;

(1) Option analysis

Option parsing  : 

--  "-s" option  : set the label of the output log, only show the log of this label;

-- "-f" option  : output the log to a file, the default output is to the standard output stream, the -f parameter is unsuccessful;

-- "-r" option  : output the log per kilobyte, the -f parameter is required, but this command was not executed successfully;

-- "-n" option  : set the maximum number of log output, requires the -r parameter, this execution feels the same as adb logcat;

-- "-v" option  : set the output format of the log, note that only one item can be set;

-- "-c" option  : clear all log cache information;

-- "-d" option  : output the cached log to the screen without blocking;

-- "-t" option  : output the last few lines of log, exit after output, without blocking;

-- "-g" option  : View log buffer information;

-- "-b" option  : load a log buffer, the default is main, detailed below;

-- "-B" option  : output log in binary form;

Output the content of the specified label  : 

--  "-s" option  : set the default filter, if we want to output the information of the "System.out" label, we can use the adb logcat -s System.out  command;

Output log information to a file  : 

--  "-f" option  : This option is followed by the input log file, use the adb logcat -f /sdcard/log.txt  command, note that this log file is output to the mobile phone, you need to specify an appropriate path.

Specify the log output format of logcat  : 

-- "-v"选项 : 使用adb logcat -v time 命令, 可以啥看日志的输出时间;

              使用adb logcat -v threadtime 命令, 可以啥看日志的输出时间和线程信息;

-- "brief"格式 : 这是默认的日志格式" 优先级 / 标签 (进程ID) : 日志信息 ", 使用adb logcat -v prief 命令;

logcat 工具在做android开发的过程中肯定是必不可少的，这里介绍几个我认为比较方便的logcat命令

1. adb logcat;

这个最简化的一个打log的命令，不过默认打出的log信息太少，个人很少用

2. adb logcat -v time;

增加加了打印时间信息

3. adb logcat -v threadtime;

这个用的最多，不仅打印了时间而且还打印了PID 和 TID，在看log的时候可以通过PID 和 TID 进一步的过滤，比较方便，TID对于调试多线程的ap很方便

4. adb logcat -v threadtime -b radio;

有的时候需要看radio的log，可以用这个了。

5. adb logcat -v threadtime | grep "keyword" ;

对于只是想看一些关键调试信息的时候，用grep命令实时的查看结果就比较方便了

6. adb logcat -v threadtime TAG1:v TAG2:v ... *:s ;
如果有多个TAG 标签，keyword不统一，不方便用grep，那么用各自的TAG标签就比较好一些，同时还可以根据log级别来过滤。