user@host ~ $ cat Peter… Peter Piper picked a peck of Pickled Peppers. user@host ~ $ cat Peter… | tr 'ie' 'ei' Pitir Pepir peckid a pick of Pecklid Pippirs. user@host ~ $ cat Peter… | tr 'Ppd' 't' teter titer ticket a teck of ticklet tetters. user@host ~ $ cat Peter… | tr '[A-Z][:space:]' '[a-z]-' peter-piper-picked-a-peck-of-pickled-peppers.-user@host ~ $ user@host ~ $ cat Peter… | tr -s per no Poto Pino nickod a nock of Picklod Ponos. user@host ~ $ cat Peter… | tr -d eio Ptr Ppr pckd a pck f Pckld Ppprs.