Historically, the '|' keybinding allows for piping a single message
to an external command. Now, by prefixing this key with a prefix
argument, (for example, by pressing "Control-U |"), all open
messages in the current thread will be sent to the external command.
Historically, the '|' keybinding allows for piping a single message
to an external command. Now, by prefixing this key with a prefix
argument, (for example, by pressing "Control-U |"), all open
messages in the current thread will be sent to the external command.