Replace a part of the string

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# 1  
Old 07-14-2011
Replace a part of the string


I need to Replace a part of string in between one complete string.

For e.g..  
in the file the value is as:
In script we are having a variable code=$3, where $3=ab
final output should be jobnm_ab_xyz_001.

But it is not working. Your help will be highly appriciated.
# 2  
Old 07-14-2011

>echo jobnm_${CODE}_xyz_001

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