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try this:

echo filename.tar.gz |awk -F. '{ print $1 }'


or

echo filename.tar.gz |cut -d'.' -f1


or sed solution

echo "filename.tar.gz" | sed 's/\(.*\)\.\(.*\)\.\(.*\)/\1/g'

or
...

try this

export user=`eval whoami`
or export user=$(whoami)
echo $user