truncate file names in Linux from a shell program

Hi Experts,
I have a bunch of files in a folder in a linux system which have names like -showcerts -showcerts

I just need the files in the names -- (without the -showcerts)

how do I rename the files or move the files to a new folder like I want?
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for f in *" -showcerts" ; do  mv "$f" "/new folder/${f% -showcerts}" ; done

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for i in `ls *showcerts`; do n=`echo $i | cut -d- -f1`; mv -v $i newfolder/$n; done
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