Script to find subtitles that do not have a matching video file, then delete it

remove_abandoned_subtitles.sh

#!/bin/bash

# Usage
# /bin/bash ./remove_abandoned_subtitles.sh /path/to/media

if [ -z "${BASH_VERSINFO}" ]; then
	echo "ERROR: You must execute this script with BASH"
	exit
fi

# get the file name. try the command line first
if [ "$1" != "" ]; then
    media_dir="$1"
else
    media_dir=/path/to/media
fi

# check if media directory is legit
if [ ! -d "$media_dir" ]; then echo "Media directory "$media_dir" doesn't exist. Try again."; exit; fi

log="$HOME/.deletedsubtitles/subtitleListToRemove.tmp"
if [ -f $log ]; then rm $log; fi

backups=$HOME/.deletedsubtitles/remove_abandoned_subtitles
if [ ! -d "$backups" ]; then mkdir -p $backups; fi

x=0
y=0
z=0

echo 

(IFS='
';
while [ $y -lt 101 ]; do
	# Search for a new extenstion each time until condition is met
	if [ $y -eq 0 ]; then search="*.en.srt"; fi
	if [ $y -eq 1 ]; then search="*.en.smi"; fi
	if [ $y -eq 2 ]; then search="*.en.sub"; fi
	if [ $y -eq 3 ]; then search="*.en.idx"; fi
	if [ $y -eq 4 ]; then search="*.en.forced.*"; fi
	if [ $y -eq 5 ]; then search="*.ko.smi"; fi
	if [ $y -eq 6 ]; then search="*.ko.srt"; fi
	if [ $y -eq 7 ]; then search="*.ko.sub"; fi
	if [ $y -eq 8 ]; then search="*.ko.idx"; fi
	if [ $y -eq 9 ]; then search="*.srt"; z=1; fi
	if [ $y -eq 10 ]; then search="*.smi"; fi
	if [ $y -eq 11 ]; then search="*.sub"; fi
	if [ $y -eq 12 ]; then search="*.idx"; y=100; fi

	ext=`echo "$search" | sed "s/*//"`
	if [ $z -eq 0 ]; then
		excludeEN="RANDOMkdsjfsld7283479"
		excludeKO="RANDOMEuwoieruuio1233i"
		excludeFORCED="RANDOMmxnvmn9890"
	else
		excludeEN="*.en$ext"
		excludeKO="*.ko$ext"
		excludeFORCED="*.forced.*"
	fi

	# find the subtitle and see if there is a media file with the same basename
	for i in `comm -23 <(find "$media_dir" -name "$search" ! -name "$excludeEN" ! -name "$excludeKO" ! -name "$excludeFORCED" | sed "s/$ext$//" | sort) <(find "$media_dir" -name '*.avi*' -o -name '*.mp4' -o -name '*.mkv' | sed "s/.\{4\}$//" | sort)`; do

		# Count the number of subtitles found
		x=$[x + 1]
		
		echo "Found ""$i""$ext" | sed "s#"$media_dir"##"
		echo "$i""$ext" >> $log
	done
	y=$[y + 1]
done

# ask if you want to remove the subtitles. if yes, moves them to backup directory
if [ $x -gt 0 ]; then 
	echo
	read -p "Found "$x" abandoned subtitles. Remove these files (y/n)? " -r
	if [[ $REPLY =~ ^[Yy] ]]; then
		chmod +x $log
		for f in $(cat $log); do
			mv "$f" $backups
		done
		echo
		echo "Moved these abandoned subtitles to $backups."
	fi
else
	echo "Found 0 abandoned subtitles."
fi)

echo