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Diverting a pipeline with tee

One command that can be very useful with piping is tee, which lets you divert a copy of the data passing between commands to a file without changing how the pipeline functions. For example, write a list of users who are on the system to the screen, and also to the file 'savewho'.

% who | tee savewho
Initially if the file 'savewho' existed it would be overwritten, so if you wished to append the information to the file, you would use tee with the '-a' option.


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