izabera 1428032107 learn # a=abcdef; eval eval printf %s '"\"\${var:"'{${#a}..0}':1}\"' "$'$\'\\n\''"
izabera 1428032149 forget
izabera 1428032156 learn # a=abcdef; eval eval printf %s '"\"\${a:"'{${#a}..0}':1}\"' "$'$\'\\n\''"