bash rounding, n-th time

18. 2. 2024

This bash function

#!/bin/bash

# awk_round

round () { 
    awk 'BEGIN{printf "%."'"$1"'"f\n", "'"$2"'"}'
}

awk_round "$1" "$2"

behaves as one would expect

awkround 0 42.1
42
awkround 0 42.5
42
awkround 0 42.6
43
awkround 0 -42.6
-43

and it is also faster than bc. However one can still use bc in scripts, just perhaps send the floating results to this fancy function (if you need rounding).

Comment here.

2024, edit: A fully local function which calculates percentage rounds to 0:

# calc percentage and round to 0
perc () {
    local tmp
    tmp="$(bc -l <<< "$1/$2*100")"
    awk 'BEGIN{printf "%."'"0"'"f\n", "'"$tmp"'"}'
}

Which could be called as:

perc="$( perc "$part" "$all" )"

bash mine