STYLE: more consistent use of stderr for script usage

bin/foamPack

@@ -33,8 +33,9 @@ packDir=$WM_PROJECT-$WM_PROJECT_VERSION
 toolsDir="${0%/*}/tools"  # this script is located in the tools/ parent dir
 
 usage() {
-    while [ $# -gt 0 ]; do echo "$1" 1>&2; shift; done
-cat <<USAGE 1>&2
+    exec 1>&2
+    while [ "$#" -gt 0 ]; do echo "$1"; shift; done
+cat <<USAGE
 Usage: ${0##*/} [OPTION]
 options:
   -o, -output <dir>     specify alternative output directory