Find and Replace based on a list

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Question Find and Replace based on a list


I have two files 'Master' and 'Rename'. Rename has two columns, the first containing old names and the second new names. I want to replace the old names in the 'Master' file with the new names. I ran the following and it does not seem to work. What needs to be done differently?



while read a b
sed -i 's/$a/$b/g' Master
done < Rename

# 2  
sed -i "s/$a/$b/g" Master

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