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How to partially replace variable value?

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# 1  
Old 06-11-2008
How to partially replace variable value?
I have variable $2 whose value is expdp_SDW_MSTR_VMDB.par
I want to replace three characters from right (par) with (log)

Input --> expdp_SDW_MSTR_VMDB.par
Output --> expdp_SDW_MSTR_VMDB.log

Thanks
Deep
# 2  
Old 06-11-2008
Code:
var=expdp_SDW_MSTR_VMDB.par
newname=${var%%par}log

# 3  
Old 06-12-2008
Hammer & Screwdriver Another approach
Note the use of the $ with the par$ in the sed command; this means to grab the text at the end of a line. Hence, the command did not change the par earlier in the text string.

Code:
> var=expdp_par_SDW_MSTR_VMDB.par
> var2=$(echo $var | sed "s/par$/log/")
> echo $var2
expdp_par_SDW_MSTR_VMDB.log

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