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$ du -s | sort -rn | perl -ple'sub humanreadable { my ($s, $q, $u) = (
+$_[0], 1, 0); $s/=$q, $q*=1024, $u++ while $s > 1024; return sprintf 
+"%.3g%s", $s, (" ", "K", "M", "G", "T")[$u] } s/^(\d+)\s+/sprintf "%1
+0s  ", humanreadable($1)/e;'

#!/usr/bin/perl -pl
use strict;
...
}

s/^(\d+)\s+/sprintf "%10s  ", humanreadable($1)/e;