tee - read from input and write to output and files

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difference > and pipe tee

 with pipe tee you can see the output and set privileges

 $ echo “deb http://repo.mongodb.org/apt/ubuntu “$(lsb_release -sc)”/mongodb-org/3.0 multiverse” | sudo tee /etc/apt/sources.list.d/mongodb-org-3.0.list

 Using tee let's you split the output. You can either view it (by directing stdout to the tty you are looking at) or pass it on to further processing.

 Another benefit: you can do echo a | sudo tee protected-file, meaning you don't need to elevate the privileges for the first command

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