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+# How-to: automate transactions and multi-output  
+
+Once silkaj installed. We want to be able to send a transaction to many recipients and to automate that process.
+
+Tutoriel based on this [forum post (fr)](https://forum.duniter.org/t/silkaj-installation-virements-automatiques-et-multi-destinataires/4836).
+
+### Create a recipient file
+You have to create a list of the public keys addresses to the recipients you wants to send money.
+
+> Example: here, we want to send money to Duniter’s pubkeys contributors.
+
+Create a `recipients.txt` file containing the list of the recipients keys. You can gather them with `silkaj id <user_id>`.
+
+> Example: 
+>
+>```txt
+>2ny7YAdmzReQxAayyJZsyVYwYhVyax2thKcGknmQy5nQ
+>FEkbc4BfJukSWnCU6Hed6dgwwTuPFTVdgz5LpL4iHr9J
+>D9D2zaJoWYWveii1JRYLVK3J4Z7ZH3QczoKrnQeiM6mx
+>HbTqJ1Ts3RhJ8Rx4XkNyh1oSKmoZL1kY5U7t9mKTSjAB
+>38MEAZN68Pz1DTvT3tqgxx4yQP6snJCQhPqEFxbDk4aE
+>5cnvo5bmR8QbtyNVnkDXWq6n5My6oNLd1o6auJApGCsv
+>GfKERHnJTYzKhKUma5h1uWhetbA8yHKymhVH2raf2aCP
+>7F6oyFQywURCACWZZGtG97Girh9EL1kg2WBwftEZxDoJ
+>CRBxCJrTA6tmHsgt9cQh9SHcCc8w8q95YTp38CPHx2Uk
+>2sZF6j2PkxBDNAqUde7Dgo5x3crkerZpQ4rBqqJGn8QT
+>4FgeWzpWDQ2Vp38wJa2PfShLLKXyFGRLwAHA44koEhQj
+>55oM6F9ZE2MGi642GGjhCzHhdDdWwU6KchTjPzW7g3bp
+>BH8ZqCsp4sbHeDPPHpto53ukLLA4oMy4fXC5JpLZtB2f
+>```
+
+### Create an authentication file
+To process automated transactions, Silkaj needs to have an authentication file allowing to spent money.
+
+In order to create this file, with your wallet’s secret credentials, run following command:
+
+```bash
+silkaj generate_auth_file
+Please enter your Scrypt Salt (Secret identifier): 
+Please enter your Scrypt password (masked): 
+Using default values. Scrypt parameters not specified or wrong format
+Scrypt parameters used: N: 4096, r: 16, p: 1
+Authentication file 'authfile' generated and stored in current folder for following public key: 
+XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+```
+
+### Run the transaction
+Finally, you just have to run following command:
+
+```bash
+silkaj tx --auth-file --amountUD 20 --output `cat recipients.txt | tr '\n' ':' | sed -e 's/:*$//'`
+```
+
+Note: Each pubkey will receive 20 UD.
+
+### Automated transaction
+If you want to automate a transaction on each first day of the month, you can set a `crontab` on your machine (preferably a server running 7/24):
+
+```bash
+0 0 1 * * silkaj tx --auth-file --yes --amountUD 20 --output `cat recipients.txt | tr '\n' ':' | sed -e 's/:*$//'`
+```
+
+Note: the `--yes` option won’t prompt a confirmation.