Update CSC SSH config

Author: AgenttiX

ssh/config.d/csc.conf

@@ -1,12 +1,12 @@
 # CSC servers
 
-Host lumi mahti puhti
+Host lumi mahti puhti roihu
     User mikamaki
     ForwardAgent yes
     PasswordAuthentication no
     ForwardX11 yes
     RequestTTY yes
-    RemoteCommand tmux has-session && tmux set-environment SSH_AUTH_SOCK "$SSH_AUTH_SOCK" \; attach-session || tmux new-session
+    RemoteCommand command -v tmux >/dev/null && (tmux has-session && tmux set-environment SSH_AUTH_SOCK "$SSH_AUTH_SOCK" \; attach-session || tmux new-session)
 
 Host lumi
     HostName lumi.csc.fi
@@ -16,3 +16,6 @@ Host mahti
 
 Host puhti
     HostName puhti.csc.fi
+
+Host roihu
+    HostName roihu.csc.fi