UG编程怎样自动修改后处理的程序头和程序尾

一切随缘qq

N0010 %
G40 G49 G80 G17 G54 G90 G00
( Thu Apr 06 15:41:17 2017)
(D: 63.00 R:6.00 )
G0 X-245.692 Y557.1 S900 M3
G43 Z50. H00
Z0.0
G1 Y620.1 F2000.
G3 X-667. Y0.0 I245.692 J-620.1
X0.0 Y-667. I667. J0.0
X667. Y0.0 I0.0 J667.
X0.0 Y667. I-667. J0.0
X-245.692 Y620.1 I0.0 J-667.
G1 Y557.1
G0 Z50.
M1
M9
G91G28Z0.M5
G28Y0.
G90G17
(time：2.23)
M30
%
这是后处理后的文件   这样刚开始跑程序的时候刀轴不会台到安全高度容易撞刀
怎么修改可以自动把G43 Z50. H00改成G00 Z50.然后再把它移动到开头G0 X-245.692 Y557.1 S900 M3  的上面
然后再把程序尾
M1
M9
G91G28Z0.M5
G28Y0.
G90G17
(time：2.23)去掉
  各位大神   求指教    求助   手动改太麻烦了   怎么修改后处理才能自动修改掉

一切随缘qq

手动修改后的
N0010 %
G40 G49 G80 G17 G54 G90 G00
( Thu Apr 06 14:22:31 2017)
(D: 63.00 R:6.00 )
G00 Z50.
G0 X-245.692 Y557.1 S900 M3
Z0.0
G1 Y620.1 F2000.
G3 X-667. Y0.0 I245.692 J-620.1
X0.0 Y-667. I667. J0.0
X667. Y0.0 I0.0 J667.
X0.0 Y667. I-667. J0.0
X-245.692 Y620.1 I0.0 J-667.
G1 Y557.1
G0 Z50.
M30
%