adb shell logcat

1 需求

• 打印指定包名的log
  • adb shell logcat -d -b main -s PRIVA_LOG --pid `pidof com.android.phone`
  • adb shell logcat -d -b main -s PRIVA_LOG --pid=$("pidof com.android.phone")

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2 语法

C:\>adb logcat --help
Usage: logcat [options] [filterspecs]

General options:
  -b, --buffer=       Request alternate ring buffer(s):
                                main system radio events crash default all
                              Additionally, 'kernel' for userdebug and eng builds, and
                              'security' for Device Owner installations.
                              Multiple -b parameters or comma separated list of buffers are
                              allowed. Buffers are interleaved.
                              Default -b main,system,crash,kernel.
  -L, --last                  Dump logs from prior to last reboot from pstore.
  -c, --clear                 Clear (flush) the entire log and exit.
                              if -f is specified, clear the specified file and its related rotated
                              log files instead.
                              if -L is specified, clear pstore log instead.
  -d                          Dump the log and then exit (don't block).
  --pid=                 Only print logs from the given pid.
  --wrap                      Sleep for 2 hours or when buffer about to wrap whichever
                              comes first. Improves efficiency of polling by providing
                              an about-to-wrap wakeup.

Formatting:
  -v, --format=       Sets log print format verb and adverbs, where  is one of:
                                brief help long process raw tag thread threadtime time
                              Modifying adverbs can be added:
                                color descriptive epoch monotonic printable uid usec UTC year zone
                              Multiple -v parameters or comma separated list of format and format
                              modifiers are allowed.
  -D, --dividers              Print dividers between each log buffer.
  -B, --binary                Output the log in binary.

Outfile files:
  -f, --file=           Log to file instead of stdout.
  -r, --rotate-kbytes=     Rotate log every  kbytes. Requires -f option.
  -n, --rotate-count=  Sets max number of rotated logs to , default 4.
  --id=                   If the signature  for logging to file changes, then clear the
                              associated files and continue.

Logd control:
 These options send a control message to the logd daemon on device, print its return message if
 applicable, then exit. They are incompatible with -L, as these attributes do not apply to pstore.
  -g, --buffer-size           Get the size of the ring buffers within logd.
  -G, --buffer-size=    Set size of a ring buffer in logd. May suffix with K or M.
                              This can individually control each buffer's size with -b.
  -S, --statistics            Output statistics.
                              --pid can be used to provide pid specific stats.
  -p, --prune                 Print prune rules. Each rule is specified as UID, UID/PID or /PID. A
                              '~' prefix indicates that elements matching the rule should be pruned
                              with higher priority otherwise they're pruned with lower priority. All
                              other pruning activity is oldest first. Special case ~! represents an
                              automatic pruning for the noisiest UID as determined by the current
                              statistics.  Special case ~1000/! represents pruning of the worst PID
                              within AID_SYSTEM when AID_SYSTEM is the noisiest UID.
  -P, --prune=' ...'    Set prune rules, using same format as listed above. Must be quoted.

Filtering:
  -s                          Set default filter to silent. Equivalent to filterspec '*:S'
  -e, --regex=          Only print lines where the log message matches  where  is
                              an ECMAScript regular expression.
  -m, --max-count=     Quit after printing  lines. This is meant to be paired with
                              --regex, but will work on its own.
  --print                     This option is only applicable when --regex is set and only useful if
                              --max-count is also provided.
                              With --print, logcat will print all messages even if they do not
                              match the regex. Logcat will quit after printing the max-count number
                              of lines that match the regex.
  -t                   Print only the most recent  lines (implies -d).
  -t ''                 Print the lines since specified time (implies -d).
  -T                   Print only the most recent  lines (does not imply -d).
  -T ''                 Print the lines since specified time (not imply -d).
                              count is pure numerical, time is 'MM-DD hh:mm:ss.mmm...'
                              'YYYY-MM-DD hh:mm:ss.mmm...' or 'sssss.mmm...' format.
  --uid=                Only display log messages from UIDs present in the comma separate list
                              . No name look-up is performed, so UIDs must be provided as
                              numeric values. This option is only useful for the 'root', 'log', and
                              'system' users since only those users can view logs from other users.

filterspecs are a series of
  [:priority]

where  is a log component tag (or * for all) and priority is:
  V    Verbose (default for )
  D    Debug (default for '*')
  I    Info
  W    Warn
  E    Error
  F    Fatal
  S    Silent (suppress all output)

'*' by itself means '*:D' and  by itself means :V.
If no '*' filterspec or -s on command line, all filter defaults to '*:V'.
eg: '*:S ' prints only , ':S' suppresses all  log messages.

If not specified on the command line, filterspec is set from ANDROID_LOG_TAGS.

If not specified with -v on command line, format is set from ANDROID_PRINTF_LOG
or defaults to "threadtime"

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3 示例：打印指定包名的log

adb shell logcat -d -b main -s PRIVA_LOG --pid `pidof com.android.phone`

adb shell logcat -d -b main -s PRIVA_LOG --pid=$("pidof com.android.phone")

adb logcat -d -b main -s PRIVA_LOG --pid `pidof com.android.phone`

adb logcat -d -b main -s PRIVA_LOG --pid=$("pidof com.android.phone")

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4 参考资料