File: sortfor2.awk

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gawk 1%3A4.2.1%2Bdfsg-1
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BEGIN {
    PROCINFO["sorted_in"] = "@ind_num_asc"
  }
  {
    A[$1] = 0
  }
  END {
    for (I in A) B[I] = A[I]
    for (I in B) SCRATCH = A[I]
    for (I in A) print I
  }