signal-cli -a ACCOUNT send -m "This is a message" RECIPIENT
```
+* Send a message to a username, usernames need to be prefixed with `u:`
+
+ ```sh
+ signal-cli -a ACCOUNT send -m "This is a message" u:USERNAME.000
+ ```
+
* Pipe the message content from another process.
uname -a | signal-cli -a ACCOUNT send --message-from-stdin RECIPIENT