[Round Number] Prints integer with rounding #Shell

math_round.sh

# math_round.sh
#
# parameter: number (float)
# example: 3.14

( echo "$1" |
    awk '{
        x=$1
        ival = int(x)    # integer part, int() truncates
        # see if fractional part
        if (ival == x)   # no fraction
          print ival   # ensure no decimals
        else {
          if (x < 0) {
            aval = -x     # absolute value
            ival = int(aval)
            fraction = aval - ival
            if (fraction >= .5)
              print int(x) - 1   # -2.5 --> -3
            else
              print int(x)       # -2.3 --> -2
          } else {
            fraction = x - ival
            if (fraction >= .5)
              print ival + 1
            else
              print ival
          }
        }
      }'
      
) 2>/dev/null ||

exit 1 #failure

exit 0 #success
  
# https://www.gnu.org/software/gawk/manual/html_node/Round-Function.html