tr

       -s, --squeeze-repeats
              replace each input sequence of a repeated character that is listed  in  SET1  with  a
              single occurrence of that character

cut 

       -d, --delimiter=DELIM
              use DELIM instead of TAB for field delimiter

       -f, --fields=LIST
              select  only these fields;  also print any line that contains no delimiter character,
              unless the -s option is specified

sed

       /regexp/
              Match lines matching the regular expression regexp.