gifo.sh

#!/bin/bash

## Make globally available with:
# sudo cp gifo.sh /usr/local/bin/gifo
# sudo chmod a+x /usr/local/bin/gifo

echo "== Add overlay to all images in this directory ==
";

function gifo_main ()
{
	def_file="fil";
	dir="merged";

	# Accept the file to copy.
	if [[ -n $1 ]]; then
        	file=$1;

	# Use default file if can.
	elif [[ -r  $def_file ]]; then
	        echo "Will copy 'fil'";
        	file=$def_file;
	else
        	echo "File is missing. What should I copy?"
	        exit;
	fi

	# Stored merged copies in a separate directory.
	if [[ ! -d $dir ]]; then
		mkdir $dir;
	fi

	# All files in directory except the source file and directories.
	for f in `find . -maxdepth 1 -name "*.png"`
	do
		# Trim the ./ part .
	        f=${f:2};

		target=$dir/$f;

		# Merge those two files.
		convert -gravity center $f $file -composite $target;
        	echo $target;
	done
}

gifo_main