option requires an argument -- fUnrecognized Option

Usage: logcat [options] [filterspecs]

options include:

  -s              Set default filter to silent.

                  Like specifying filterspec '*:s'

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

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

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

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



                  brief process tag thread raw time threadtime long



  -c              clear (flush) the entire log and exit

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

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

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

  -b <buffer>     request alternate ring buffer

                  ('main' (default), 'radio', 'events')

  -B              output the log in binary

  -C              colored output

filterspecs are a series of

  <tag>[:priority]



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

  V    Verbose

  D    Debug

  I    Info

  W    Warn

  E    Error

  F    Fatal

  S    Silent (supress all output)



'*' means '*:d' and <tag> by itself means <tag>:v



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

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



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

or defaults to "brief"