Memo

egrep -v "^(#|$)"

ls $PWD/awstats.pl

for i in $(ls *.m4a);do avconv -i $i ${i/.m4a/.mp3} ; done

mkdir rep{1,2,3}

cp ntp.conf{,.bak}

echo {1..111}

echo {1,2,3,4,5}

echo $((1+1))

insert -- between the command (like cp) and its arguments. That tells it to stop scanning for options, and all is well
cp -- "$file" "$target"