Glenn Fowler wrote:
>>>> [ x$install = xyes ] && ...
>>>
>>> or use the ksh93 [[ ... ]]
>>>
>>> [[ $install == yes ]] && ...
>
>> Or even
>
>> [[ ${install:-no} == yes ]]
>
> why complicate $install to ${install:-no} ?
Just because ;-)
Actually, because it will still work correctly even if the -u flag is set:
$ ksh -eu '[[ $foo == bar ]]'
ksh: foo: parameter not set
$ ksh -eu '[[ ${foo:-no} == bar ]]'
--
Alan Burlison
--
