batchConvertNEF.sh

#!/usr/bin/env bash

############################################ 
## This program converts a directory of .NEF images to jpeg, png or TIFF format.
## It also resizes the images
## 
## Examples: 
##  ./FILENAME FORMAT WIDTH_RESIZE
##  ./batchConvertNEF.sh png 500 
##  ./batchConvertNEF.sh jpeg 

outputExtensionOptions=(jpeg tiff png) #Check the convert -h docs for available save options, if not an option, resorts to dcraw type

outputFileExtension=$1
if [[ -z "$outputFileExtension" ]]; then
    echo "need output param, eg: $0 <jpeg|png|tiff>"
    exit 1
fi
if [[ ! ${outputExtensionOptions[*]} =~ $outputFileExtension ]]; then
    echo "valid outputs are: ${outputExtensionOptions[*]}"
    exit 1
fi
echo "Saving NEF files as $outputFileExtension"

outputImageWidth=$2
if [[ -n "$outputImageWidth" ]]; then
    echo "Images will be made $outputImageWidth px wide"
else
    echo "To resize image, do: $0 <jpeg|png|tiff> <output width in px>"
fi

for fileName in $(ls)
do
    if [[ $fileName != *".NEF" ]]; then
        continue
    fi
    echo $fileName
    
    if [[ -z "$outputImageWidth" ]]; then
        dcraw -c $fileName | convert - "$fileName.$outputFileExtension" 
    else
        dcraw -c $fileName | convert - -scale $outputImageWidth "$fileName.$outputFileExtension" 
    fi
done

For my future reference, this is what my Nikon camera produces... NEF format