LINE Messaging APIでgroupIdを取得してPush APIでグループにメッセージを送る ref: http://qiita.com/kenichi_odo/items/18badf7c069334d9c3a2

Token・Idは修正済

curl -X POST \
-H 'Content-Type:application/json' \
-H 'Authorization: Bearer 0Sw81tcX82eGuKkMPYRgbvDUeAIbgPC+wKR8T1aKaWy4+7dpUzR2t9XpVDQw1cKivU1AVBD6tE/DIWSz60QTW9UCyC7lJgE+u74XvEceuoMqmZkZdAxw/DMybh6hffSwUhDg74qcrlRZLPRIcahC/wdB04t89/1O/w1cDnyilFU=' \
-d '{
    "to": "C23fcbe8d92b0e428298ae1e32585fb36",
    "messages":[
        {
            "type":"text",
            "text":"Hello, world1"
        },
        {
            "type":"text",
            "text":"Hello, world2"
        }
    ]
}' https://api.line.me/v2/bot/message/push