(( )) is purely for arithmetic expressions.
I think the simplest, most readable valid "upgrade"
to your original expression is
if (( $# > 1 )) && [[ -t 0 && -t 1 ]]; then
Anyway, that's how I would do it. :-)
-Mario D
Lifelong disciple of the KISS programming principle
and avid ksh fan since 1983.
On 5/11/2010 8:32 PM, Andrew Clarke wrote:
Folks,
I'm way overdue for changing my habit of using [[ ]] and replacing it
with use of (( )) where appropriate. But as I'm trying to rewrite
if [[ $# -gt 1 ]]&& [[ -t 0&& -t 1 ]]; then
into something like
if (($#> 1&& -t 0&& -t 1)); then
I see that operators like -n, -z, -t, -r, -x, etc are not accepted. Am I
missing something? Can [[ ]] or $(( )) or anything similar be nested
inside these expressions?
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