#! /bin/bash

if [ $# -eq 0 ] || [ $# -gt 1 ]; then
    echo "Exactly ONE argument needed"
else
	filename=$1
	extension="${filename##*.}"
	filename="${filename%.*}"
	if [ "$extension" == "enc" ]; then
		openssl enc -d -aes-256-cbc -in $1 -out $filename
	else
		echo "Extension should be .enc, decrypting anyway"
		openssl enc -d -aes-256-cbc -in $1 -out $1.dec
	fi
fi