Relay forwards all messages from an IRC channel to a slack channel, and all messages from a single user in the slack channel back to the IRC channel.
$ relay -help
Usage of relay:
-ircchannel string
The IRNC channel to relay
-ircfullname string
The IRC full name
-ircnick string
The IRC nick name
-ircpassword string
The password for the IRC server
-ircserver string
The IRC host and port (default "irc.freenode.net:7000")
-ircssl
Whether to use SSL to connect to the IRC server (default true)
-slackchannel string
The channel (with # prefix) or private channel (no # prefix)
-slacknick string
The username to relay into IRC
-slacktoken string
The slack token