Small shell syntax improvement.

src/tools/pgindent/pgindent

 #!/bin/sh
 
-# $PostgreSQL: pgsql/src/tools/pgindent/pgindent,v 1.99 2008/04/16 21:03:08 momjian Exp $
+# $PostgreSQL: pgsql/src/tools/pgindent/pgindent,v 1.100 2008/11/03 15:56:47 momjian Exp $
 
 # Known bugs:
 #
@@ -9,7 +9,7 @@
 #	y = (int) x *y;
 
 if [ "$#" -lt 2 ]
-then	echo "Usage:  `basename $0` typedefs file [...]" 1>&2
+then	echo "Usage:  $(basename $0) typedefs file [...]" 1>&2
 	exit 1
 fi