ftail (custom tail command for Fluentd File output plugin)

install it yourself as:

$ gem install ftail

command example:

$ ftail <filename>
$ ftail --grep [match-word] <filename>
$ ftail --grepv [invert-match-word] <filename>
$ ftail --grep [word] --grepv [word] <filename>
$ ftail <filename> --grep [word]

grep example:

$ tail /var/log/td-agent/td-agent_fileoutput.log
2013-02-22T12:37:01Z    fluent.info {"message"=>"", "date"=>2013-02-22T12:37:00Z}
2013-02-22T12:37:02Z    fluent.info {"message"=>"", "date"=>2013-02-22T12:37:01Z}

$ ftail /var/log/td-agent/td-agent_fileoutput.log
Tailing /var/log/td-agent/td-agent_fileoutput.log
2013-02-22T12:37:01Z    fluent.info
{"message"=>"",
 "date"=>2013-02-22T12:37:00Z}
----------------------------------------------------------------------------------------------------------------------------------------
2013-02-22T12:37:02Z    fluent.info
{"message"=>"",
 "date"=>2013-02-22T12:37:01Z}
----------------------------------------------------------------------------------------------------------------------------------------