The [[ ]] operators are for compound tests, the [ ] operator is for simple
tests. In ksh newer than 6/3/86 the [[ ]] makes the [ ] obsolete.
Example of [[ ]]:
[[ foo > bar && $PWD -ef . ]] && print foobar
foobar
That is from the kornshell book co-written by David Korn.
By the way, I use ksh for my root's shell and it works fine.
-Derek
At 10:31 AM 9/25/2006, Arindam wrote:
I know csh is the shell of choice on FreeBSD. But I have this question
on Korn Shell and it would be great if somebody could explain.
Can someone tell me a little more about the Korn Shell [[ ... ]]
double-brackets construct used for comparing string expressions. How
does it differe from the standard [ ... ] single brackets.
You could tell me to RTFM but I haven't gleaned enough clarity from
such efforts already expended.
It would be great if you could give some idea through examples.
Cheers,
Andy
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