Add --height option

src/util/util_unix.go

@@ -5,6 +5,7 @@ package util
 import (
 	"os"
 	"os/exec"
+	"syscall"
 )
 
 // ExecCommand executes the given command with $SHELL
@@ -20,3 +21,8 @@ func ExecCommand(command string) *exec.Cmd {
 func IsWindows() bool {
 	return false
 }
+
+// SetNonBlock executes syscall.SetNonblock on file descriptor
+func SetNonblock(file *os.File, nonblock bool) {
+	syscall.SetNonblock(int(file.Fd()), nonblock)
+}