mkdir $2
cp -R $1/* $2

for file in $1/*;do #all files in testInput
   if [ -d "$file" ] #if its a file then look at the contents of it
   then
      for inDir in $file/*; do
         if [ -d "$inDir" ]
         then
            for line in $inDir ; do
               if [ line != *.txt ]
               then
                  rm line

               fi
            done
          fi
       done

    else
       for files in file; do
          if [ files != *.txt ]
          then
             rm files
          fi
       done

    fi
done

find "$1" -type f ! -name "*.txt" -exec mv {} "$2" ;

find "$dir" -type f ! -name "*.txt" -exec rm {} ;

if [ line != *.txt ]
# ...
if [ files != *.txt ]

[[ $line =~ .txt$ ]] || rm line

for files in file; do

for files in "$file"/*; do