Tee

<tool, operating system> A Unix command which copies its standard input to its standard output (like cat) but also to a file given as its argument.

tee is thus useful in pipelines of Unix commands (see plumbing) where it allows you to create a duplicate copy of the data stream. E.g.

egrep Unix Dictionary | tee /dev/tty | wc -l

searches for lines containing the string "Unix" in the file "Dictionary", prints them to the terminal (/dev/tty) and counts them.

Unix manual page: tee(1).

[Jargon File]

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technology Technology Enabled Relationship Manager Technology of Object-Oriented Languages and System TechRef TECO	100BaseT 100BaseVG 120 reset 16 bit Ada	TEI telco TELCOMP Telecommunication Display Device Telecommunications Device for the Deaf