Shell - Replace

Shell Programming and Scripting
1

Hello ,

I am trying to replace a pattern in shell script , basically there is a file with the list of tables like
A.DAT
B.DAT
C.DAT ..

I will need to replace a prefix for the list

TESTA.DAT
TESTB.DAT
TESTC.DAT

Do I need to use <tr> or sed , I am not sure whether I need to use awk to get the print $1 , in my case it's always one string

Thanks,

2 
awk '{ print "TEST" $0 }' < infile > outfile

$0 is a special variable in awk which means 'the entire line'.

3

Thank you , this helps

If I have to include an variable which is populated in the Run time
like , for e-g

CCode='Google'

awk '{ print "TEST_$CCode" $0 }' < test > test1

Please advice

Thanks

4 
awk -v VAR="stuff" '{ print VAR $0 }'
5 
CCode='Google'
sed "s/^/${CCode}/" infile