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Tee (command)

tee is a shell command that copies data from standard input to one or more files in addition to standard output, duplicating the input to each output. The name derives from the tee pipe fitting even though the command duplicates the input into each output instead of dividing the input into portions for each output. The command is often used with pipes and filters. Similar behaving commands are provided by many shells although syntax varies. The command is provided in Unix and Unix-like systems, OS-9, MS-DOS / PC DOS and compatibles, Windows (e.g. 4NT, PowerShell, UnxUtils ), ReactOS and IBM i. The Linux version was written by Mike Parker, Richard Stallman, and David MacKenzie. The FreeDOS version was developed by Jim Hall and is licensed under the GPL. Additionally the sponge command offers similar capabilities.

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Article summary

tee is a shell command that copies data from standard input to one or more files in addition to standard output, duplicating the input to each output. The name derives from the tee pipe fitting even though the command duplicates the input into each output instead of dividing the input into portions for each output. The command is often used with pipes and filters. Similar behaving commands are provided by many shells although syntax varies. The command is provided in Unix and Unix-like systems, OS-9, MS-DOS / PC DOS and compatibles, Windows (e.g. 4NT, PowerShell, UnxUtils ), ReactOS and IBM i. The Linux version was written by Mike Parker, Richard Stallman, and David MacKenzie. The FreeDOS version was developed by Jim Hall and is licensed under the GPL. Additionally the sponge command offers similar capabilities.

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  1. Summarise the article in your own words. Which single claim would you verify first, and why?
  2. Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
  3. If two sources disagreed about one of these facts, what would you need in order to trust one over the other?

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