commands executing in piping in UNIX

Posted by Happy Mittal on Super User See other posts from Super User or by Happy Mittal
Published on 2010-04-16T11:16:21Z Indexed on 2010/04/18 6:43 UTC
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when I write a command

$ echo date  

then it prints "date" as it is i.e it doesn't run date program.
But when I write

$ echo date | wc  

then correct answer is produced as if date was run. How piping is making difference here ?
Please explain.

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