How to send a voice note file to a Telegram group from bash shell script

This article shows you how to send a voice note file (e.g. an OPUS file) to a registered Telegram group from a bash shell script.

To send a Telegram message containing a voice note file to a group from a bash shell script, do this:

1. First, learn how to send a simple text message to a group on the official site.
2. With the above knowledge, you can now download our sample code.
3. Locate the file bash/group-send-telegram-opus.sh.

   	#!/bin/bash
   	#######################################################################
   	# You will need to have the utility `base64` available on your Linux
   	# system to run this script.
   	#
   	# To install it:
   	# sudo apt-get install coreutils
   	#######################################################################
   	# TODO: Put down your own Client ID and secret here:
   	INSTANCE_ID="YOUR_OWN_INSTANCE_ID_HERE"
   	CLIENT_ID="YOUR_OWN_CLIENT_ID_HERE"
   	CLIENT_SECRET="YOUR_OWN_SECRET_HERE"
   	# TODO: Customize the following 5 files:
   	group_name="Muscle Men Club"
   	group_admin="12025550108"
   	base64_audio=`base64 -w 0 ../assets/martin-luther-king.opus`
   	fn="anyname.opus"
   	caption="I have a dream"
   	cat > /tmp/jsonbody.txt << _EOM_
   	{
   	"group_name": "$group_name",
   	"group_admin": "$group_admin",
   	"voice_note": "$base64_audio",
   	"filename": "$fn",
   	"caption": "$caption"
   	}
   	_EOM_
   	curl --show-error -X POST \
   	-H "X-WM-CLIENT-ID: $CLIENT_ID" \
   	-H "X-WM-CLIENT-SECRET: $CLIENT_SECRET" \
   	-H "Content-Type: application/json" \
   	--data-binary @/tmp/jsonbody.txt \
   	https://api.whatsmate.net/v3/telegram/group/voice_note/message/$INSTANCE_ID
   	echo -e "\n=== END OF DEMO ==="

   view raw group-send-telegram-opus.sh hosted with ❤ by GitHub
4. Study the script and customize the TODO/FIXME lines.
5. Change to the directory containing the script: cd bash
6. Run the script to send your group the first OPUS file: ./group-send-telegram-opus.sh

Happy coding :)