For this simple requirement of removing '$' and ',' in addition to CR/LF, Donald Catto's binary character-at-a-time "filter" is quite adequate.

However, I am compelled to share with the Forum members how concisely text processing languages can deal with such problems. The following two-line awk script accomplishes the task.

{ gsub( /[$,]/, "" )
  printf( "%s", $0 ) }

The real benefit to text processing languages is apparent when pattern matching and regular expressions are required.