nthcol

#!/bin/bash

col=$1

if [[ -z "$col" ]]; then
  echo "nthcol <num>"
  exit 1
fi


spec=""

while [[ ! -z "$col" ]]; do
  spec="$spec \$$col \" \""
  shift 1
  col=$1
done

read -r -d '' cmd <<FOO
`cat <<EOF | trim
{ print $spec }
EOF`
FOO

awk "$cmd"