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/usr/share/pcb/tools/Merge_dimPCBPS is in pcb-common 20140316-3.

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The actual contents of the file can be viewed below.

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#!/bin/sh
#
# merges PostScript files created by pcb (version >= 1.4.2) into
# a single file for backward compatibility
#
# Usage: name files...
#
# by Thomas Nau 9/96
#

if [ $# -eq 0 ]; then
	echo "Usage: `basename $0` files..." >&2
	exit 1
fi

# some system need nawk
#
case `uname` in
	SunOS)	AWK=nawk;;
	*)		AWK=awk;;
esac

$AWK '
	BEGIN								{ filecount = 0; }
	/^%!PS/								{ filecount++;  if (filecount > 1) { print "Black"; } }
	/^%!PS/,/^% PCBENDDATA/				{
		if (filecount == 1)
		{
			if (index($0, "%%Title:") == 1)
				sub(",.*$", ", merged layouts");
                        if (index($0, "Black") == 1)
                           sub ("Black", "0.9 mysetgray");
			print $0;
			next;
		}
	}
	/^% PCBSTARTDATA/,/^% PCBENDDATA/	{
		if (filecount > 1)
		{
			print $0;
			next;
		}
	}
										{ next; }
	END									{
		print "showpage";
		print "%%EOF";
	}
' $@