*********************
   $ bash "$d_strings"'strings header.sh' 
   08********08
   [chr, str] basics 
   [grep, sed]*[Search, Replace]ChrsAsStrL  - for general text inputs,  eg fileReads
      assumes that chrs have not already been escaped, if so - this isn't needed  
      problematic chrs for sedSearch= ^$\&'",*.-[]{}\|/  won't do ^$&\ for now, just '",*.[]{}-/
   sedChrL_legend  - chrL of special chrs that have to be encoded for sed 
      sed[x]To[y] - sedExpressions to [, de]-code chrSedL between [human, encoded] formats
   characters [special, unicode] often used ... : 
   unicode >1 byte sequences    
   chrs_QNialSymbols  - res ipsa loquitor (not complete, but should be safe)
   Howell's Flat-Liner Notation (HFLN) - including unicode for QNial