# quoted null problems in versions of bash prior to 3.2 str='12' snul=$'\177' recho "${str:2}" recho "+${str:2}" recho "+${snul:0:1}" recho "+""${str:2}" recho "${str/?/$snul}" recho ${str/?/$snul} recho "${snul/x/y}" recho ${snul/x/y} recho "${snul/$snul/}" recho "${str/$str/}" recho "${snul##$snul}" recho "${str##$str}" recho "${str##$nul}"