elif is a contraction of else if used to extend if statements

if Foo do x elif Bar then y elif dah then z else .... etc

I *think* the -z is to see if variable is set or not (ie - unset variables = 0)

the SMTP_CDB looks like a qmail variable, but my guess is the line in question is checking to see if SMTP_CDB variable in a qmail config file has been assigned a value.

HTH

Steve

Email Lists wrote:

Greetings

Im am not a perl programmer yet I am trying to learn and am debugging someone elses perl run script for use on a centos production box I have and I came across this

elif [ -z "${SMTP_CDB:-}" ]

Can someone please shed some light on what this eval means in English please?

im mainly concerned with the stuff between the two " yet I need all the help I can get

what does that say? Im trying to figure out if there is a typo or something in the script.

I am not a perl programmer yet im sure I will be before I get done with this exercise in the next coupla weeks

Thanks and kind regards

• rh

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