Sending stardard error only to a pipe

[m.w.chang]

http://www.linux.se/doc/HOWTO/Adv-Bash-Scr-HOWTO/io-redirection.html

Joel Hammer wrote:
> I understand how to send std out to a pipe ( | ), and how to send std out and std
> error to a pipe, ( 2>&1 | ), but how to send just std error to a pipe?
> Thanks,
> Joel
> 

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