prrgrrmmng
od -t u4 -N 4 /dev/random | sed 's/^[0-9]* *//' | tr -d ' \n' | awk 'BEGIN{chars="0123456789ABCDEFGHJKMNPQRSTVWXYZ&~@=U"}{d=32^5;r=$0%32^6;printf "%s",substr(chars,r%37,1);while(d>0){printf "%s",substr(chars,int(r/d),1);if(d==32^4)printf "%s","-";r%=d;d=int(d/32)}}'