UNIX for Dummies Questions & Answers

awk -F"||" '{for(i=1;i<=NF;i++) if (!a[$i]++) {str=str" "$i}} END{print str}' infile

cat remove_duplicate_char | tr "|" "\n" | awk '!a[$NF]++' | tr "\n" " "

T111  T222 T444 T555

awk '
        {
                gsub ( /\|\|/, " " )
                for ( i = 1; i <= NF; i++ )
                {
                        if ( !( $i in A ) )
                                printf "%s ", $i
                        A[$i]
                }
                printf "\n"
        }
' file

awk '
BEGIN {FS="[|][|]"}
{
  for (i=1;i<=NF;i++) {
    if (A[$i]++==0) {printf "%s", sep $i; sep=" "}
  }
  print ""
}
' file

awk '
BEGIN {RS="[|][|]"}
A[$1]++==0 {printf "%s", sep $1; sep=" "}
END {print ""}
' file