James Carlson wrote:
> Roland Mainz writes:
> > Does anyone know whether the "=="-operator for [[ ]] was...
> > 1. ... already supported for ksh88 ?
> > 2. ... documented for ksh88 (a grep over ksh(1) in Solaris 11/B84 does
> > not list it) ?
>
> Not sure how that grep was done, but I see this in the ksh(1) man page
> for the old Solaris ksh:
>
> [[expression]]
>
> Evaluates expression and returns 0 exit status when
> expression is true. See Conditional Expressions for a
> description of expression.
To clarify:
ksh88 and ksh93 allow two different operators to compare strings in [[
]], e.g ...
[[ "foo" = "foo" ]]
and
[[ "foo" == "foo" ]]
... but runing a lint (e.g. $ shcomp -n myscript.sh /dev/null #) says:
-- snip --
myscript.sh: warning: line 1: '=' obsolete, use '=='
-- snip --
... for the 2nd form.
I assume this is just a documentation bug that ksh(1) in Solaris does
not list "==" as allowed operator for string comparisations.
----
Bye,
Roland
--
__ . . __
(o.\ \/ /.o) roland.mainz at nrubsig.org
\__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer
/O /==\ O\ TEL +49 641 3992797
(;O/ \/ \O;)
