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:-}" ]
That's not perl, that is part of a shell script.
${SMTP_CDB:-} returns an empty string if the Variable $SMTP_CDB is not
set. See "Parameter Expansion" in the manual page of bash. And "test -z
$string" returns true, if $string is empty.
Regards,
Ralph
--
Ralph Angenendt......ra@xxxxxxxxxxxx | .."Text processing has made it possible
Bayerischer Rundfunk...80300 München | ....to right-justify any idea, even one
Programmbereich.Bayern 3, Jugend und | .which cannot be justified on any other
Multimedia.........Tl:089.5900.16023 | ..........grounds." -- J. Finnegan, USC
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