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Stupid Shell Tricks With Apache Accumulo

Mike Drob

madrob@cloudera.com

@mikhaildrob

About Mike

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• Dev at Cloudera (~ 6 months)

• Accumulo Committer (~ 1 year)

• LEGO® Engineer (~ 20 years)

http://upload.wikimedia.org/wikipedia/commons/0/00/LEGO_Minifigure_skating_through_town.jpg

Survey

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• Who knows…

• Who this guy is?

• That 1.6.0 is released!

• Who has…

• Used Accumulo?

• Used the Shell?

http://en.wikipedia.org/wiki/File:Concentration_Hugh_Downs_1961.JPG

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http://en.wikipedia.org/wiki/File:Bubalus_mindorensis_by_Gregg_Yan_01.jpg

New Shell Features

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• Password Indirection

• Command Interruption

• History Search/Expansion

• Provide Extensions

http://www.flickr.com/photos/cygnus921/2581020296/

Password Indirection

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• Providing password on command line is BAD

• …but typing long passwords is hard.

• Exposed to ps and other tools

• Solution: provide alternate sources

• File on disk

• Environment Variable

• Custom Tokens

Command Interruption

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• Long running commands are a pain.

• Ctrl-C used to kill the whole shell…

• Now it just kills the current command!

https://www.flickr.com/photos/smaedli/3271558744/

History Search/Expansion

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• Many bash-similarities

• Ctrl-R to search history

• Use ! To expand commands

http://en.wikipedia.org/wiki/File:Trilobite_Ordovicien_8127.jpg

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Thank You! Mike Drob, Cloudera

@mikhaildrob

(p.s. we’re hiring)