#!/usr/bin/nawk -f
#
# mdf - df(1) "-k" option with "MB/GB/TB" suffixes
# 29 Sep 2001, Antoni Sawicki <tenox@tenox.tc>
#

BEGIN {
	LSCMD="/usr/bin/df -k"

	printf("Device                   Total      Used      Free     Cap  Mounted On\n")
	while(LSCMD|getline) 
	if ($1 !~ /^Filesystem/) {

		# Device and total size
		count($2)
		if (length($1) >= 23) $1=$1 "\n                       "
		printf("%-23s %6.1f %2s", $1, nsize, unit)

		# Used space
		count($3)
		printf(" %6.1f %2s", nsize, unit)

		# Avaiable space
		count($4)
		printf(" %6.1f %2s", nsize, unit)

		# Percentage and Mounted On
		printf("  %3s  %s\n", $5, $6)
	}
	close(PSCMD)
}

function count(osize) {
		if(osize >= 1024   && osize < 1024^2 )      { nsize = osize/1024;   unit = "Mb" }
		else if(osize >= 1024^2 && osize < 1024^3 ) { nsize = osize/1024^2; unit = "Gb" }
		else if(osize >= 1024^3 && osize < 1024^4 ) { nsize = osize/1024^3; unit = "Tb" }
		else 					    { nsize = osize;        unit = " k" }
}