Byte Unit Conversion with Decimal in Bash

unitconversion.sh

#!/bin/sh

unit_conversion(){
	B="${1}"
	KB="$(awk -v "p=${B}" 'BEGIN{ p=p / 1024; printf "%0.2f", p}')"
	MB="$(awk -v "p=${KB}" 'BEGIN{ p=p / 1024; printf "%0.2f", p}')"
	GB="$(awk -v "p=${MB}" 'BEGIN{ p=p / 1024; printf "%0.2f", p}')"
	TB="$(awk -v "p=${GB}" 'BEGIN{ p=p / 1024; printf "%0.2f", p}')"
	[ "${TB%%.*}" -gt "0" ] && printf '%s %s\n' "${TB}" "TB" && return 0
	[ "${GB%%.*}" -gt "0" ] && printf '%s %s\n' "${GB}" "GB" && return 0
	[ "${MB%%.*}" -gt "0" ] && printf '%s %s\n' "${MB}" "MB" && return 0
	[ "${KB%%.*}" -gt "0" ] && printf '%s %s\n' "${KB}" "KB" && return 0
	[ "${B%%.*}" -gt "0" ] && printf '%s %s\n' "${B}" "B"
}

unit_conversion "$1"

root@OK:~# unit_conversion "372637383"
Output:
355.37 MB