adb logcat 命令详解 log过滤

eclipse 自带的 LogCat 工具太垃圾了, 开始用 adb logcat 在终端查看日志;

<a name="t0" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a><a target="_blank" name="t0" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a>1. 解析 adb logcat 的帮助信息

在命令行中输入 adb logcat --help 命令, 就可以显示该命令的帮助信息;

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  1. octopus@octopus:~$ adb logcat --help

  2. Usage: logcat [options] [filterspecs]

  3. options include:

  4. -s Set default filter to silent.

  5. Like specifying filterspec '*:s'

  6. -f <filename> Log to file. Default to stdout

  7. -r [<kbytes>] Rotate log every kbytes. (16 if unspecified). Requires -f

  8. -n <count> Sets max number of rotated logs to <count>, default 4

  9. -v <format> Sets the log print format, where <format> is one of:

  10. brief process tag thread raw time threadtime long

  11. -c clear (flush) the entire log and exit

  12. -d dump the log and then exit (don't block)

  13. -t <count> print only the most recent <count> lines (implies -d)

  14. -g get the size of the log's ring buffer and exit

  15. -b <buffer> Request alternate ring buffer, 'main', 'system', 'radio'

  16. or 'events'. Multiple -b parameters are allowed and the

  17. results are interleaved. The default is -b main -b system.

  18. -B output the log in binary

  19. filterspecs are a series of

  20. <tag>[:priority]

  21. where <tag> is a log component tag (or * for all) and priority is:

  22. V Verbose

  23. D Debug

  24. I Info

  25. W Warn

  26. E Error

  27. F Fatal

  28. S Silent (supress all output)

  29. '' means ':d' and <tag> by itself means <tag>:v

  30. If not specified on the commandline, filterspec is set from ANDROID_LOG_TAGS.

  31. If no filterspec is found, filter defaults to '*:I'

  32. If not specified with -v, format is set from ANDROID_PRINTF_LOG

  33. or defaults to "brief"

adb logcat 命令格式 : adb logcat [选项] [过滤项], 其中 选项 和 过滤项 在 中括号 [] 中, 说明这是可选的;

<a name="t1" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a><a target="_blank" name="t1" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a>(1) 选项解析

选项解析 :

-- "-s"选项 : 设置输出日志的标签, 只显示该标签的日志;

-- "-f"选项 : 将日志输出到文件, 默认输出到标准输出流中, -f 参数执行不成功;

-- "-r"选项 : 按照每千字节输出日志, 需要 -f 参数, 不过这个命令没有执行成功;

-- "-n"选项 : 设置日志输出的最大数目, 需要 -r 参数, 这个执行 感觉 跟 adb logcat 效果一样;

-- "-v"选项 : 设置日志的输出格式, 注意只能设置一项;

-- "-c"选项 : 清空所有的日志缓存信息;

-- "-d"选项 : 将缓存的日志输出到屏幕上, 并且不会阻塞;

-- "-t"选项 : 输出最近的几行日志, 输出完退出, 不阻塞;

-- "-g"选项 : 查看日志缓冲区信息;

-- "-b"选项 : 加载一个日志缓冲区, 默认是 main, 下面详解;

-- "-B"选项 : 以二进制形式输出日志;

.

输出指定标签内容 :

-- "-s"选项 : 设置默认的过滤器, 如 我们想要输出 "System.out" 标签的信息, 就可以使用 adb logcat -s System.out 命令;

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  1. octopus@octopus:~$ adb logcat -s System.out
  2. --------- beginning of /dev/log/system
  3. --------- beginning of /dev/log/main
  4. I/System.out(22930): GSM -91
  5. I/System.out(22930): SignalStrength issssssssss : -91
  6. I/System.out(22930): GSM -91
  7. I/System.out(22930): SignalStrength issssssssss : -91
  8. I/System.out(22930): Supervisor Thread
  9. I/System.out(22930): Got run mode

输出日志信息到文件 :

-- "-f"选项 : 该选向后面跟着输入日志的文件, 使用 adb logcat -f log 命令, 会出现错误, 这里我们不推荐使用该选项;

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  1. octopus@octopus:~$ adb logcat -f log
  2. couldn't open output file: Read-only file system

-- ">"输出 : ">" 后面跟着要输出的日志文件, 可以将 logcat 日志输出到文件中, 使用 adb logcat > log 命令, 使用 more log 命令查看日志信息;

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  1. octopus@octopus:~$ adb logcat > log
  2. ^C
  3. octopus@octopus:~$ more log
  4. --------- beginning of /dev/log/system
  5. V/ActivityManager( 500): We have pending thumbnails: null
  6. V/ActivityManager( 500): getTasks: max=1, flags=0, receiver=null
  7. V/ActivityManager( 500): com.android.settings/.Settings: task=TaskRecord{42392278 #448 A com.android.settings U 0}
  8. V/ActivityManager( 500): We have pending thumbnails: null

指定 logcat 的日志输出格式 :

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

-- "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;

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  1. octopus@octopus:~$ adb logcat -v brief
  2. --------- beginning of /dev/log/system
  3. D/PowerManagerService( 500): handleSandman: canDream=true, mWakefulness=Awake
  4. D/PowerManagerService( 500): releaseWakeLockInternal: lock=1101267696, flags=0x0

-- "process"格式 : " 优先级 (进程ID) : 日志信息 ", 使用 adb logcat -v process 命令;

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  1. octopus@octopus:~$ adb logcat -v process
  2. --------- beginning of /dev/log/system
  3. D( 500) MobileDataStateReceiver received: ACTION_ANY_DATA_CONNECTION_STATE_CHANGED_MOBILE [wap] (MobileDataStateTracker)
  4. V( 500) Broadcast: Intent { act=android.intent.action.ANY_DATA_STATE_MOBILE flg=0x10 (has extras) } ordered=true userid=0 (ActivityManager)
  5. D( 500) wap: Intent from SIM 0, current SIM 0, current DataState DISCONNECTED (MobileDataStateTracker)
  6. D( 500) wap: wap setting isAvailable to false (MobileDataStateTracker)
  7. D( 500) wap: Received state=DISCONNECTED, old=DISCONNECTED, reason=dataDetached (MobileDataStateTracker)
  8. D( 500) BDC-Calling finishReceiver: IIntentReceiver=41c46ba0 (ActivityThread)

-- "tag"格式 : " 优先级 / 标签 : 日志信息", 使用 adb logcat -v tag 命令;

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  1. octopus@octopus:~$ adb logcat -v tag
  2. --------- beginning of /dev/log/system
  3. I/PowerManagerService: setBrightness mButtonLight 0.
  4. D/PowerManagerService: updateScreenStateLocked: mDisplayReady=true, newScreenState=2, mWakefulness=1, mWakeLockSummary=0x1, mUserActivitySummary=0x1, mBootCompleted=true
  5. D/PowerManagerService: handleSandman: canDream=true, mWakefulness=Awake

-- "thread"格式 : " 优先级 ( 进程ID : 线程ID) 标签 : 日志内容 ", 使用 adb logcat -v tag 命令;

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  1. octopus@octopus:~$ adb logcat -v thread
  2. --------- beginning of /dev/log/system
  3. V( 500: 2141) getTasks: max=1, flags=0, receiver=null
  4. V( 500: 2141) com.lewa.launcher/.Launcher: task=TaskRecord{41dccc20 #425 A com.lewa.launcher U 0}
  5. V( 500: 2141) We have pending thumbnails: null
  6. V( 500: 2140) getTasks: max=1, flags=0, receiver=null

-- "raw"格式 : 只输出日志信息, 不附加任何其他 信息, 如 优先级 标签等, 使用 adb logcat -v raw 命令;

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  1. octopus@octopus:~$ adb logcat -v raw
  2. --------- beginning of /dev/log/system
  3. notifications are enabled for com.kindroid.security
  4. Assigned score=0 to Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])
  5. Native set alarm :Alarm{41e1ca00 type 3 com.kindroid.security}
  6. reset poweroff alarm none

-- "time"格式 : "日期 时间 优先级 / 标签 (进程ID) : 进程名称 : 日志信息 " , 使用 adb logcat -v time 命令;

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  1. octopus@octopus:~$ adb logcat -v time
  2. --------- beginning of /dev/log/system
  3. 04-25 17:18:13.019 V/ActivityManager( 500): Broadcast sticky: Intent { act=android.intent.action.SIG_STR flg=0x10 (has extras) } ordered=false userid=-1
  4. 04-25 17:18:13.157 V/NotificationService( 500): enqueueNotificationInternal: pkg=com.kindroid.security id=1020 notification=Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])
  5. 04-25 17:18:13.158 V/NotificationService( 500): notifications are enabled for com.kindroid.security
  6. 04-25 17:18:13.158 V/NotificationService( 500): Assigned score=0 to Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])
  7. 04-25 17:18:13.555 V/ActivityManager( 500): getTasks: max=1, flags=0, receiver=null

-- "long"格式 : " [ 日期 时间 进程ID : 线程ID 优先级 / 标签] 日志信息 ", 输出以上提到的所有的头信息, 使用 adb logcat -v long 命令;

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  1. octopus@octopus:~$ adb logcat -v long

  2. --------- beginning of /dev/log/system

  3. [ 04-25 17:21:18.118 500:0x2fe V/ActivityManager ]

  4. We have pending thumbnails: null

  5. [ 04-25 17:21:18.696 593:0x251 W/ActivityThread ]

  6. Content provider com.android.providers.telephony.TelephonyProvider already published as telephony

  7. [ 04-25 17:21:19.119 500:0x396 V/ActivityManager ]

  8. getTasks: max=1, flags=0, receiver=null

清空日志缓存信息 : 使用 adb logcat -c 命令, 可以将之前的日志信息清空, 重新开始输出日志信息;

将缓存日志输出 : 使用 adb logcat -d 命令, 输出命令, 之后推出命令, 不会进行阻塞;

输出最近的日志 : 使用 adb logcat -t 5 命令, 可以输出最近的5行日志, 并且不会阻塞;

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  1. octopus@octopus:~$ adb logcat -t 5
  2. --------- beginning of /dev/log/system
  3. --------- beginning of /dev/log/main
  4. W/ADB_SERVICES(10028): adb: unable to open /proc/10028/oom_adj
  5. D/dalvikvm(23292): threadid=11: created from interp
  6. D/dalvikvm(23292): start new thread
  7. D/dalvikvm(23292): threadid=11: notify debugger
  8. D/dalvikvm(23292): threadid=11 (Thread-24538): calling run()
  9. octopus@octopus:~$

查看日志缓冲区信息 : 使用 adb logcat -g 命令;

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  1. octopus@octopus:~$ adb logcat -g
  2. /dev/log/main: ring buffer is 256Kb (255Kb consumed), max entry is 5120b, max payload is 4076b
  3. /dev/log/system: ring buffer is 256Kb (255Kb consumed), max entry is 5120b, max payload is 4076b
  4. octopus@octopus:~$

加载日志缓冲区 : 使用 adb logcat -b 缓冲区类型 命令;

--** Android中的日志缓冲区** : system缓冲区 - 与系统相关的日志信息, radio缓冲区 - 广播电话相关的日志信息, events缓冲区 - 事件相关的日志信息, main缓冲区 - 默认的缓冲区;

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  1. octopus@octopus:~$ adb logcat -b radio -t 5
  2. D/PHONE (23599): [GeminiDataSubUtil] UAPP_C6-4
  3. D/GSM (23599): [GDCT][simId1]apnType = default
  4. D/GSM (23599): [GDCT][simId1]isDataAllowed: not allowed due to - gprs= 1 - SIM not loaded - desiredPowerState= false
  5. D/GSM (23599): [GDCT][simId1]isDataPossible(default): possible=false isDataAllowed=false apnTypePossible=true apnContextisEnabled=true apnContextState()=IDLE
  6. I/MUXD (23591): [gsm0710muxd] 3426:main(): Frames received/dropped: 18242/0
  7. octopus@octopus:~$
  8. octopus@octopus:~$ adb logcat -b main -t 5
  9. D/NotificationService( 500): notification.sound=null
  10. D/NotificationService( 500): mDmLock=false
  11. I/ATCIJ (16576): Couldn't find 'atci-serv-fw' socket; retrying after timeout
  12. W/ADB_SERVICES( 246): create_local_service_socket() name=shell:export ANDROID_LOG_TAGS="" ; exec logcat -b main -t 5
  13. W/ADB_SERVICES(16815): adb: unable to open /proc/16815/oom_adj
  14. octopus@octopus:~$
  15. octopus@octopus:~$ adb logcat -b system -t 5
  16. D/PowerManagerService( 500): updateScreenStateLocked: mDisplayReady=true, newScreenState=0, mWakefulness=0, mWakeLockSummary=0x1, mUserActivitySummary=0x0, mBootCompleted=true
  17. D/PowerManagerService( 500): handleSandman: canDream=false, mWakefulness=Asleep
  18. V/NotificationService( 500): enqueueNotificationInternal: pkg=com.kindroid.security id=1020 notification=Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])
  19. V/NotificationService( 500): notifications are enabled for com.kindroid.security
  20. V/NotificationService( 500): Assigned score=0 to Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])
  21. octopus@octopus:~$
  22. octopus@octopus:~$ adb logcat -b event -t 5
  23. Unable to open log device '/dev/log/event': No such file or directory
  24. octopus@octopus:~$ adb logcat -b events -t 5
  25. I/notification_cancel( 500): [com.kindroid.security,1026,NULL,0,0,64]
  26. I/notification_enqueue( 500): [com.kindroid.security,1020,NULL,0,Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])]
  27. I/notification_cancel( 500): [com.kindroid.security,1026,NULL,0,0,64]
  28. I/notification_enqueue( 500): [com.kindroid.security,1020,NULL,0,Notification(pri=0 contentView=com.kindroid.security/0x7f030052 vibrate=null sound=null defaults=0x0 flags=0x2 kind=[null])]
  29. I/notification_cancel( 500): [com.kindroid.security,1026,NULL,0,0,64]
  30. octopus@octopus:~$

以二进制形式输出日志 : 使用 adb logcat -B 命令;

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  1. octopus@octopus:~$ adb logcat -B -t 5
  2. O���_�3ZS��4�gps_mt3326nmea_reader_parse: line = 1218GPS get accuracy failed, fix mode:1
  3. ^���_�3ZS��=�gps_mt3326nmea_reader_addc: line = 1331the structure include nmea_cb address is 0x658cc8e8
  4. H���_�3ZSEGE�gps_mt3326nmea_reader_addc: line = 1332nmea_cb address is 0x5d2fe279
  5. i���3ZS�)>�ADB_SERVICEScreate_local_service_socket() name=shell:export ANDROID_LOG_TAGS="" ; exec logcat -B -t 5
  6. 7EE�3ZSo�Y�ADB_SERVICESadb: unable to open /proc/17706/oom_adj

<a name="t2" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a><a target="_blank" name="t2" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a>(2) 过滤项解析

过滤项格式 : <tag>[:priority] , 标签:日志等级, 默认的日志过滤项是 " *:I " ;

-- V : Verbose (明细);

-- D : Debug (调试);

-- I : Info (信息);

-- W : Warn (警告);

--** E** : Error (错误);

--** F **: Fatal (严重错误);

-- S : Silent(Super all output) (最高的优先级, 可能不会记载东西);

过滤指定等级日志 : 使用** adb logcat 10 :E* 命令, 显示 Error 以上级别的日志;

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<embed id="ZeroClipboardMovie_16" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="16" height="16" name="ZeroClipboardMovie_16" align="middle" allowscriptaccess="always" allowfullscreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="id=16&width=16&height=16" wmode="transparent" style="box-sizing: border-box;">

  1. octopus@octopus:~$ adb logcat *:E

  2. Note: log switch off, only log_main and log_events will have logs!

  3. --------- beginning of /dev/log/main

  4. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

  5. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;

  6. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

  7. E/dalvikvm( 756): GC_CONCURRENT freed 1809K, 27% free 19489K/26695K, paused 16ms+5ms, total 109ms

  8. E/WifiHW ( 441): wifi_send_command : SCAN ; interface index=0;

  9. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;

  10. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

  11. E/dalvikvm( 756): GC_CONCURRENT freed 1820K, 27% free 19490K/26695K, paused 16ms+3ms, total 102ms

  12. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;

  13. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

过滤指定标签等级日志 : 使用 *adb logcat WifiHW:D :S 命令进行过滤;

-- 命令含义 : 输出10条日志, 日志是 标签为 WifiHW, 并且优先级 Debug(调试) 等级以上的级别的日志;

-- *注意 :S : 如果没有 *S 就会输出错误;

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<embed id="ZeroClipboardMovie_17" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="16" height="16" name="ZeroClipboardMovie_17" align="middle" allowscriptaccess="always" allowfullscreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="id=17&width=16&height=16" wmode="transparent" style="box-sizing: border-box;">

  1. octopus@octopus:~$ adb logcat WifiHW:D *:S

  2. Note: log switch off, only log_main and log_events will have logs!

  3. --------- beginning of /dev/log/main

  4. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

  5. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;

  6. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

  7. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;

  8. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

  9. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;

  10. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

可以同时设置多个过滤器 : 使用 *adb logcat WifiHW:D dalvikvm:I :S 命令, 输出 WifiHW 标签 的 Debug 以上级别 和 dalvikvm 标签的 Info 以上级别的日志;

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<embed id="ZeroClipboardMovie_18" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="16" height="16" name="ZeroClipboardMovie_18" align="middle" allowscriptaccess="always" allowfullscreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="id=18&width=16&height=16" wmode="transparent" style="box-sizing: border-box;">

  1. octopus@octopus:~$ adb logcat WifiHW:D dalvikvm:I *:S

  2. Note: log switch off, only log_main and log_events will have logs!

  3. --------- beginning of /dev/log/main

  4. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;

  5. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

  6. E/dalvikvm( 756): GC_CONCURRENT freed 1820K, 27% free 19490K/26695K, paused 17ms+2ms, total 110ms

  7. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;

  8. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

  9. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;

  10. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

  11. E/dalvikvm( 756): GC_CONCURRENT freed 1810K, 27% free 19489K/26695K, paused 17ms+5ms, total 108ms

  12. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;

  13. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;

<a name="t3" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a><a target="_blank" name="t3" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a>2. 使用管道过滤日志

<a name="t4" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a><a target="_blank" name="t4" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a>(1) 过滤固定字符串

过滤固定字符串 : 只要命令行出现的日志都可以过滤, 不管是不是标签;

-- 命令 : adb logcat | grep Wifi ;

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<embed id="ZeroClipboardMovie_19" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="16" height="16" name="ZeroClipboardMovie_19" align="middle" allowscriptaccess="always" allowfullscreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="id=19&width=16&height=16" wmode="transparent" style="box-sizing: border-box;">

  1. octopus@octopus:~$ adb logcat | grep Wifi
  2. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
  3. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
  4. E/WifiHW ( 441): wifi_send_command : SCAN ; interface index=0;
  5. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
  6. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
  7. E/WifiHW ( 441): wifi_send_command : AP_SCAN 1 ; interface index=0;
  8. E/WifiHW ( 441): wifi_send_command : SCAN_RESULTS ; interface index=0;
image

过滤字符串忽略大小写 : adb logcat | grep -i wifi ;

image

<a name="t5" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a><a target="_blank" name="t5" style="box-sizing: border-box; background: transparent; color: rgb(79, 161, 219); text-decoration: none; margin: 0px; padding: 0px; font-weight: 400; outline: 0px;"></a>(2) 使用正则表达式匹配

分析日志 : 该日志开头两个字符是 "V/", 后面开始就是标签, 写一个正则表达式 "^..ActivityManager", 就可以匹配日志中的 "V/ActivityManager" 字符串;

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<embed id="ZeroClipboardMovie_20" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="16" height="16" name="ZeroClipboardMovie_20" align="middle" allowscriptaccess="always" allowfullscreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="id=20&width=16&height=16" wmode="transparent" style="box-sizing: border-box;">

  1. V/ActivityManager( 574): getTasks: max=1, flags=0, receiver=null

**正则表达式过滤日志 **: 使用上面的正则表达式组成命令 adb logcat | grep "^..Activity" ;

image
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