fixes #3

Author: Cerem Cem ASLAN

create-gist.sh

@@ -11,11 +11,11 @@ print_usage(){
 
  usage:
 
- $(basename $0) /path/to/file [Github user name]
+ $(basename $0) /path/to/file Github_user_name
 
  or
 
- lsusb | $(basename $0) [Github user name]
+ lsusb | $(basename $0) Github_user_name
 
 USAGE
 }
@@ -35,6 +35,11 @@ else
  fi
 fi
 
+if [[ -z $GITHUB_USERNAME ]]; then
+ print_usage
+ exit 2
+fi
+
 
 # 1. Somehow sanitize the file content
 # Remove \r (from Windows end-of-lines),