Create data URI image from Terminal command

image64.sh

#! /usr/bin/env bash
# Examples:
# ./image64.sh myImage.png
#   outputs: data:image/png;base64,xxxxx
# ./image64.sh myImage.png -img
#   outputs: <img src="data:image/png;base64,xxxxx">


function usage {
	echo "usage: $0 <image_filename> [--img]"
	echo -e "\n    image_filename\n      A path to a gif, jpg, png or ico image"
	echo -e "\n    --img\n      Output an html img tag"
}

if [ $# -eq 0 ]; then
	echo "Error: No image file provided"
	usage
	exit 1
fi

filename=$(basename $1)
xtype=${filename##*.}
append=""

if [ ! -f "$1" ]; then
	echo "Error: File does not exist"
	usage
	exit 1
fi

if [ $xtype == gif ]; then
	append="data:image/gif;base64,";
elif [ $xtype == jpeg ] || [ $xtype == jpg ]; then
	append="data:image/jpeg;base64,";
elif [ $xtype == png ]; then
	append="data:image/png;base64,";
elif [ $xtype == svg ]; then
	append="data:svg+xml;base64,";
elif [ $xtype == ico ]; then
	append="data:image/vnd.microsoft.icon;base64,";
else
	echo "Error: Unknown image type"
	usage
	exit 1
fi

#Mathias Bynens - http://superuser.com/questions/120796/os-x-base64-encode-via-command-line
data=$(openssl base64 < $1 | tr -d '\n')

if [ "$#" -eq 2 ] && [ $2 == -img ]; then
	data=\<img\ src\=\"$append$data\"\>
else
	data=$append$data
fi

echo $data | pbcopy

echo "copied to clipboard"

Added usage and basic checks for proper command line args