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What Does This Variable Assignment Mean?

2003-10-16 17:33:45
I was going through some PROCMAIL .cf files and came across this line:

SECURITY_NOTIFY=${SECURITY_NOTIFY:-"postmaster"}

This is similar to another line that I saw (and changed) on a different file
some time back. I thought it was a "placeholder" some kind, but now it
appears it's an actual "variable assignment." But I can't figure out from
context what it means.

Can someone help me out here?

William L. Polhemus, Jr. P.E.
Polhemus Engineering Company
Katy, Texas USA





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