awk-round

#!/bin/bash
argv=
for i; do
	if [[ $i =~ ^[0-9]+$ ]];
	then
		field=$i
	else
		argv="$argv $i"
	fi
	shift
done
unset i
awk $argv -v argnum=${field:-1} '

function round(x, ival, aval, fraction) {
   ival = int(x)    # integer part, int() truncates

   # see if fractional part
   if (ival == x)   # no fraction
      return ival   # ensure no decimals

   if (x < 0) {
      aval = -x     # absolute value
      ival = int(aval)
      fraction = aval - ival
      if (fraction >= .5)
         return int(x) - 1   # -2.5 --> -3
      else
         return int(x)       # -2.3 --> -2
   } else {
      fraction = x - ival
      if (fraction >= .5)
         return ival + 1
      else
         return ival
   }
}

{ print round($(argnum)) }

'