How to rename with prefix/suffix?

Question

How do I do mv original.filename new.original.filename without retyping the original filename?

I would imagine being able to do something like mv

Answer 1

Bulk rename files bash script

#!/bin/bash
# USAGE: cd FILESDIRECTORY; RENAMERFILEPATH/MultipleFileRenamer.sh FILENAMEPREFIX INITNUMBER
# USAGE EXAMPLE: cd PHOTOS; /home/Desktop/MultipleFileRenamer.sh 2016_
# VERSION: 2016.03.05.
# COPYRIGHT: Harkály Gergő | mangoRDI (https://wwww.mangordi.com/) 

# check isset INITNUMBER argument, if not, set 1 | INITNUMBER is the first number after renaming
if [ -z "$2" ]
    then i=1;
else
    i=$2;
fi

# counts the files to set leading zeros before number | max 1000 files
count=$(ls -l * | wc -l)
if [ $count -lt 10 ]
    then zeros=1;
else
    if [ $count -lt 100 ]
        then zeros=2;
    else
        zeros=3
    fi
fi

# rename script
for file in *
do
    mv $file $1_$(printf %0"$zeros"d.%s ${i%.*} ${file##*.})
    let i="$i+1"
done