Limit regex search for BEGIN to the first 4K of the file.

magic/Magdir/commands

@@ -1,6 +1,6 @@
 
 #------------------------------------------------------------------------------
-# $File: commands,v 1.48 2014/03/04 12:20:42 kim Exp $
+# $File: commands,v 1.49 2014/05/28 19:52:36 christos Exp $
 # commands:  file(1) magic for various shells and interpreters
 #
 #0	string/w	:			shell archive or script for antique kernel text
@@ -56,8 +56,7 @@
 !:mime	text/x-awk
 0	string/wt	#!\ /usr/bin/awk	awk script text executable
 !:mime	text/x-awk
-0       search/16384    BEGIN
->0	regex		=^\\s{0,100}BEGIN\\s{0,100}[{]	awk script text
+0	regex/4096	=^\\s{0,100}BEGIN\\s{0,100}[{]	awk script text
 
 # AT&T Bell Labs' Plan 9 shell
 0	string/wt	#!\ /bin/rc	Plan 9 rc shell script text executable