start_eiger_gui: add -x option to only start the receivers

eiger/scripts/start_eiger_gui

 #!/bin/bash
 
 as_root=0
-[ -n "$1" ] && [ "$1" = "-r" ] && shift && as_root=1
+only_receiver=0
+
+while getopts rx opt_arg; do
+    case ${opt_arg} in
+	r) as_root=1;;
+        x) only_receiver=1;;
+    esac
+done
 
 if [ -z "${EIGER_DIR}" ]; then
 	if [ "$(id -un)" != 'root' ]; then
@@ -11,8 +18,9 @@ if [ -z "${EIGER_DIR}" ]; then
 	. /etc/profile
 	PATH=$PATH:/users/blissadm/local/bin:/users/blissadm/bin export PATH
 	old_home=${HOME}
-	HOME=$(dirname $1)
-	. $1
+	setup_file="${!OPTIND}"
+	HOME=$(dirname ${setup_file})
+	. ${setup_file}
 	HOME=${old_home}
 fi
 
@@ -60,6 +68,11 @@ for m in ${EIGER_MODULES}; do
 done
 sleep 2
 
+if [ ${only_receiver} -ne 0 ]; then
+	wait
+	exit 0
+fi
+
 hv_set=150
 
 (sleep 10