Fix env var comparison

README.md

@@ -3,3 +3,18 @@
 A simple BIRD CLI tool to show BGP peers in a pretty table.
 
 ![xb](example.png)
+
+## instructions
+
+Download one of the binaries from the releases page.
+
+```bash
+wget https://github.com/x6c-co/xb/releases/download/v0.1.0-alpha/xb_Linux_x86_64.tar.gz
+tar -xf xb_Linux_x86_64.tar.gz
+sudo install ./xb /usr/local/bin
+xb
+```
+
+By default, `xb`, looks for the `bird.ctl` file at `/var/run/bird/bird.ctl`. You
+can tell `xb` to use a different path by either passing the `-socket` argument
+or using the `BIRD_SOCKET` environment variable.

cmd/xb/main.go

@@ -36,7 +36,7 @@ const (
 )
 
 func main() {
-	if os.Getenv(birdSocketKey) == emptyString {
+	if os.Getenv(birdSocketKey) != emptyString {
 		socketPath = os.Getenv(birdSocketKey)
 	}