":-", in combination with "set -u" in shell scripts, used to allow some
variables to be empty. That it looks like a smiley is just an added
bonus.
Example:
$ set -u
$ echo ${START}
bash: START: unbound variable
$ echo ${START:-}
$
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https://bugs.launchpad.net/bugs/789998
Title:
Varnish startscript broken in natty
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