Was cutting a m3u8 file containing IPTV channels. Figured the best way to sort them is by scripting it just for the fun of it. m3u8sort.sh does what it says it sorts it.

m3u8sort.sh

#!/bin/bash

if [ $# -eq 0 ]; then
    echo "Usage: $0 <path/to/m3u8>"
    exit
fi

FILE=$1
TMPFILE="$FILE.new"

counter=0
rm -f "$TMPFILE"
touch "$TMPFILE"
echo "#EXTM3U" >> "$TMPFILE"
cat "$FILE" | while read line; do
    if [[ "$line" = *EXTINF* ]]; then
        let counter=counter+1
        Channel=`echo $line | cut -d',' -f2`
        echo "#EXTINF:$counter,$Channel" >> "$TMPFILE"
    elif [[ "$line" = *EXTM3U* ]]; then
        echo -n ""
    else
        echo $line >> "$TMPFILE"
    fi
done
mv "$FILE" "$FILE.back"
mv "$TMPFILE" "$FILE"