Maintenance of btmp

• When we get to the second file, test each user for presence in the array “vu”

  NR > FNR && $1 in vu
  
  {
  # keep a subscripted array
  for (i=5;iɬi--)
  data[$1,i]=data[$1,i-1]
  data [$1,0]=$0
  }

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