A simple script to make the .avi and .srt file names of my favorite series equal.

name.sh

#!/bin/bash

if [ $# -gt 0 ]; then
    basepath="$1"
else
    basepath=
fi

for i in "${basepath}"*.mkv; do
    e=$(echo "${basepath}"$i | sed -e 's/.*[Ss][0-9]\+[Ee]\([0-9]\+\).*/\1/')
    x=$(ls -1 "${basepath}"*[Ss][0-9]*[Ee]$e*.srt)
    mv "$i" "${x%%.srt}.mkv"
done