Or cutting out bash-specific stuff: 
for i in *.html; do mv $i `echo $i|sed 's/unwanted/replace/'`; done

[download]
I recommend putting an echo between the do and mv first to make sure it's doing what you expect.

Will need further work if you have whitespace in filenames.

In reply to Re: Re: batch rename with a 1 liner by DrHyde
in thread batch rename with a 1 liner by Theo

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