sample

{code}
echo -e ‘logstash\nfluentd\nflume’ | bin/logstash -e ‘input { stdin {} } output { stdout {codec => rubydebug}}’
{
“message” => ‘logstash’,
“@version” => “1”,
“@timestamp” => “2015-01-17T16:18:46.175Z”,
“host” => “hope”
}
{
“message” => “fluentd”,
“@version” => “1”,
“@timestamp” => “2015-01-17T16:18:46.175Z”,
“host” => “hope”
}
{
“message” => “flume”,
“@version” => “1”,
“@timestamp” => “2015-01-17T16:18:46.175Z”,
“host” => “hope”
}
{/code}

{code}
input {
stdin{}
}
filter {
mutate {
replace => {message => “%{message} こんにちは！”}
}
}
output {
stdout {
codec => rubydebug
}
}
{/code}