Quick script for prefixing images with Bash.

Bash Image Prefixer

#!/bin/bash

if [ ! -z "$1" ]
then
    PREFIX=$1
else
    echo "Enter the filename prefix:"
    read PREFIX
fi

shopt -s nullglob
for FILE in *.png *.jpg *.jpeg *.gif
do
    echo "Renaming $FILE to $PREFIX$FILE. . ."
    mv "$FILE" "$PREFIX$FILE"
done