Bash function to create a unique filename

unique_name.sh

unique_name() {
    local base=$1
    local ext=$2
    local name="${base}.${ext}"
    if [[ -e $name || -L $name ]]; then
        i=1
        while [[ -e "${base}-${i}.${ext}" || -L "${base}-${i}.${ext}" ]]; do
            let i++
        done
        name="${base}-${i}.${ext}"
    fi
    echo $name;
}

# filename=$(unique_name "foo-$(date +%Y-%m-%d)" "tgz")