pretty-sizes.py

#!/usr/bin/env python3
import re
import sys

def sizeof_fmt(num, suffix="B"):
    for unit in ["", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"]:
        if abs(num) < 1024.0:
            return f"{num:3.1f}{unit}{suffix}"
        num /= 1024.0
    return f"{num:.1f}Yi{suffix}"

for line in sys.stdin:
    columns = line.split()
    if len(columns) > 5 and re.fullmatch("[0-9a-fA-F]+", columns[5]):
        columns[5] = sizeof_fmt(int(columns[5], base=16))
        print(" ".join(columns))
    else:
        print(line)