SED to replace file content

Shell Programming and Scripting
1

Hi,
I want to replace _F* by _F in a xml file. what is the sed command.
I have tried sed "s/_F$/_F/g" or sed "s/_F*/_F/g" , but it does not work. thx

file content
<TAG>KC_FOU</TAG>
<TAG>KC_FABC</TAG>
<TAG>KC_FABCDG</TAG>

desire output
<TAG>KC_F</TAG>
<TAG>KC_F</TAG>
<TAG>KC_F</TAG>

2

Try...

sed 's/_F[^<]*/_F/g'
3

Hi Ygor
It almost done. But my file actually is
<CODE="KC_FOU">
<TAG>KC_FOU</TAG>
<CODE="KC_FABC">
<TAG>KC_FABC</TAG>
<CODE="KC_FABCDG">
<TAG>KC_FABCDG</TAG>

you command cut the <CODE="KC_FABCDG"> become <CODE="KC_F

4

Why didn't you post what your file actually is to start with?
Try...

sed 's/_F[^<"]*/_F/g'
5

sorry , I am not a programmer. may be I don't know how to ask in correct way.
what if I want to keep <CODE......> line unchanged. only <TAG>.... is replaced.
the output become
<CODE="KC_FOU">
<TAG>KC_F</TAG>
<CODE="KC_FABC">
<TAG>KC_F</TAG>
<CODE="KC_FABCDG">
<TAG>KC_F</TAG>
Thx

6 
sed '/<TAG>/s/_F[^<]*/_F/'
7

it works . thx Ygor and cherry