Auto Increment when watching TV series

autoinc-tvseries.sh

#!/bin/sh

cur=$(cat current);

serie=$(echo $cur | awk -F"x" '{print $1}');
episode=$(echo $cur | awk -F"x" '{print $2}');

if ! [[ "$serie" =~ ^[0-9]+$ ]]; then
	echo "Unmatched serie, exit";
	exit;
fi;

if ! [[ "$episode" =~ ^[0-9]+$ ]]; then
	echo "Unmatched episode, exit";
	exit;
fi;

echo "Now we are at $serie serie - $episode episode";

next_episode=$(($episode+1));
if (( next_episode<10 )); then 
	next_episode=$(echo '0'$next_episode)
fi;

next_episode_string=$(echo $serie'x'$next_episode);
echo "Next episode should be $next_episode_string"

next_episode_file=$(find . -name "*$next_episode_string*");
if [ -z "$next_episode_file" ]; then
	echo "No file found, you're going to the next season!";
	next_serie = $((serie+1));
	next_episode_string = $(echo $next_serie'x01');
	next_episode_file=$(find . -name "*$next_episode_string*");
fi;

echo "Updating and opening";
echo "$next_episode_string" > current;

open "$next_episode_file";