常用例子

单个 Tag 过滤

  1. //<tag>[:priority]
  2. //后面优先级不区分大小写,参数区分
  3. adb logcat -s Xposed
  4. //或者
  5. adb logcat  Xposed *:s

多个 Tag 过滤

  1. //<tag>[:priority]
  2. adb logcat ActivityManager:I  MyApp:D *:S

grep 关键字过滤

  1. adb logcat |grep keywords

输出到文件

  1. adb logcat -f /sdcard/log.txt -n2 -r20 log.txt

log.txt
log.txt.1
log.txt.2
后面会会循环输出达到其中3个文件 -r 是大小

logcat

  1. Usage: logcat [options] [filterspecs]
  2. options include:
  3.   -s              Set default filter to silent.
  4.                   Like specifying filterspec '*:s'
  5.   -f <filename>   Log to file. Default to stdout
  6.   -r [<kbytes>]   Rotate log every kbytes. (16 if unspecified). Requires -f
  7.   -n <count>      Sets max number of rotated logs to <count>, default 4
  8.   -v <format>     Sets the log print format, where <format> is one of:
  10.                   brief process tag thread raw time threadtime long
  12.   -c              clear (flush) the entire log and exit
  13.   -d              dump the log and then exit (don't block)
  14.   -t <count>      print only the most recent <count> lines (implies -d)
  15.   -g              get the size of the log's ring buffer and exit
  16.   -b <buffer>     Request alternate ring buffer, 'main', 'system', 'radio'
  17.                   or 'events'. Multiple -b parameters are allowed and the
  18.                   results are interleaved. The default is -b main -b system.
  19.   -B              output the log in binary
  20. filterspecs are a series of
  21.   <tag>[:priority]
  23. where <tag> is a log component tag (or * for all) and priority is:
  24.   V    Verbose
  25.   D    Debug
  26.   I    Info
  27.   W    Warn
  28.   E    Error
  29.   F    Fatal
  30.   S    Silent (supress all output)
  32. '*' means '*:d' and <tag> by itself means <tag>:v
  34. If not specified on the commandline, filterspec is set from ANDROID_LOG_TAGS.
  35. If no filterspec is found, filter defaults to '*:I'
  37. If not specified with -v, format is set from ANDROID_PRINTF_LOG
  38. or defaults to "brief"

参考文档

https://www.cnblogs.com/JianXu/p/5468839.html