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Try using eval:
eval p"$n"="$p"

It's not a very good practise to set variables like this though. A much better way is to set arrays:
$ a[1]=test
$ echo ${a[1]}
test

Or try:
for f in *.mpg
do
if [ -f "$f" ]; then
ffmpeg -i "./$f" -vcodec copy -an "na/$f"
fi
done

Try:awk '/^[^ \t]/{$0=++i" "$0}1' file

I concocted this awk, you could perhaps give it a try:
echo "word" | awk 'NR==1{w=$0; l=split(w,W)} length==l{for(i=1;i<=l;i++)if(gsub(W[i],"&",w)!=gsub(W[i],"&"))next;print}' FS= - wordlist
I...

Hi.

echo hello | fold -w 1 | sort -r | tr -d '\n';echo
producing
ollhe
See man pages for details.

Best wishes ... cheers, drl