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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
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No need to type out the full OR clause if you know which OS you're on, but this is easy cut-n-paste or alias to get top ten directories by singleton.
To avoid the error output from du -xSk you could always 2>/dev/null but you might miss relevant STDERR.
There are 6 alternatives - vote for the best!
If you can do better, submit your command here.
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More importantly, if you have a mixed environment and want to run the same du on multiple systems (say, in a loop using ssh with authorized_keys files already set up), this is a way to not care which OS each box has...