Sending stardard error only to a pipe

[m.w.chang]

0 is stdin
1 is stdout
2 is stderr

if I remember correctly.

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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