Alas, your last two methods put a 400K file before a 399M file... For the first one, I added a "K" key to your anonymous hash: 

perl -e 'sub h{pop=~/^([\d.]+)(.)/&&{K,1e1,M,1e3,G,1e6}->{$2}+$1}print
+ sort{h($b)<=>h$a}`du -h`'

[download]

For the second one, I think you're in a bind because ord(k)&7 and ord(K)&7 are equal...

And I offer another method, bumming heavily from yours, longer but possibly faster on large filesystems: 

perl -e 'print map substr($_,8),reverse sort map sprintf("%8d",(/^([\d
+.]+)([kKMG])/)?{K,1e1,M,1e3,G,1e6}->{$2}+$1:$1).$_,`du -h`'

[download]

In reply to Re^4: du -h, sorted by hbm
in thread du -h, sorted by bellaire

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