Mark Henry wrote:
>
> Hi All,
Hello,
> Wondering if someone has feedback on this..
>
> When using backticks to capture the output of an external command, one can
> scan each line as it happens, or dump the output into an array and then go
> back and take a look.
>
> foreach $line (`$mycmd`) {
> if ($line=~/[Ee]rror) { last; }
> ....
>
> vs.
>
> @cmdoutput=`$mycmd`;
> foreach $line (@cmdoutput) {
> if ($line=~/[Ee]rror) { last; }
> ....
>
> I'm wondering if the 'last' statement into the first example above, will
> affect, or strand perhaps, the process I started by the backticks? last
> would effectively cease attempts to read data from the command, but the
> command hasn't terminated gracefully at this non-completed stage, and in
> this case is it just abandoned? Or will perl clean up after me?
foreach will store the output of the command in a list and then iterate
over that list. The command has ended by the time the first statement
in the loop is encountered.
John
--
use Perl;
program
fulfillment
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