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Buscamos @botfather en Telegram

Escribimos

/newbot

Nos contesta que ahora le tenemos que poner un nombre que acabe con la palabra “bot”:

Alright, a new bot. How are we going to call it? Please choose a name for your bot.

Ponemos el nombre del bot

jurjurbot

Nos contesta:

Good. Now let's choose a username for your bot. It must end in `bot`. Like this, for example: TetrisBot or tetris_bot.

Le ponemos:

jurjurbot

Nos dice que está creado y nos da el token del bot que debemos guardar.

Done! Congratulations on your new bot. You will find it at t.me/jurjurbot. You can now add a description, about section and profile picture for your bot, see /help for a list of commands. By the way, when you've finished creating your cool bot, ping our Bot Support if you want a better username for it. Just make sure the bot is fully operational before you do this.

Use this token to access the HTTP API:
2144753637:AAHX3BhhasddifNTDbJSvhLlYp-dGvnTxmPtk
Keep your token secure and store it safely, it can be used by anyone to control your bot.

For a description of the Bot API, see this page: https://core.telegram.org/bots/api

Metemos usuario en el grupo y sacamos el nombre del grupo con el comando:

curl -X GET https://api.telegram.org/bot<token>/getUpdates|jq

Por ejemplo:

curl -X GET https://api.telegram.org/bot2345053637:AAHX3BhheADTFDTDbJSvhLlYp-dGvnTxmPtk/getUpdates|jq

Nos devuelve:

      "update_id": 151787201,
      "message": {
        "message_id": 11,
        "from": {
          "id": 123123123,
          "is_bot": false,
          "first_name": "Mi usuario telegram",
          "username": "UsuarioTelegram",
          "language_code": "en"
        },
        "chat": {
          "id": -648234144,
          "title": "Nombre del grupo",
          "type": "group",          
          "all_members_are_administrators": true
        },

El ID del grupo es:

-648234144

Puedo enviar un mensaje con el comando:

curl -s -X POST https://api.telegram.org/bot<TOKEN>/sendMessage -d chat_id=<CHAT_ID> -d text="prueba"

Por ejemplo:

curl -s -X POST https://api.telegram.org/bot2143367637:AAHX3BhgThifNTDbJSvhLlYp-dGvnTxmPtk/sendMessage -d chat_id=-648234144 -d text="prueba"

Podemos hacer el script:

#!/bin/bash
TOKEN="2143367637:AAHX3BhgThifNTDbJSvhLlYp-dGvnTxmPtk"
CHAT_ID="-648234144"

URL="https://api.telegram.org/bot$TOKEN/sendMessage"
curl -s -X POST $URL -d chat_id=$CHAT_ID -d text="$1"