Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris

Re: Is it possible to write to STDIN ?

by DrHyde (Prior)
on Jul 21, 2014 at 14:54 UTC ( #1094513=note: print w/replies, xml ) Need Help??

in reply to Is it possible to write to STDIN ?

$ foo | bar

'bar's STDIN is whatever 'foo' spits to STDOUT. So if you can control how your code is executed from the shell, you can control its STDIN. For example ...

for i in `seq 1 10`; do echo $i|./; done
will execute your script ten times, each time with a different number on its STDIN.

Replies are listed 'Best First'.
Re^2: Is it possible to write to STDIN ?
by exilepanda (Friar) on Jul 21, 2014 at 15:18 UTC
    Hey, this one is interesting and seem very likely what I am looking for... but please have a look for what I am planning to do, and could you advise can I do this inside the code rather than pipe it from the shell?
    $ENV{REQUEST_METHOD} = "POST"; open F, "testplan.txt" or die $!; while ( chomp ( my $data = <F> ) ) { ### DO ANYTHING TO MAKE $data BECOME STDIN ### # the main() script that reads and handle the form # print final result # next test plan data } close F;
      You could close STDIN and re-open it as a normal filehandle:
      close(STDIN); open(STDIN, 'foo'); print $_ foreach(<STDIN>);
      The documentation for 'open' shows how to save and restore filehandles, and some other dirty tricks you can play.

Log In?

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://1094513]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others browsing the Monastery: (3)
As of 2023-03-21 08:26 GMT
Find Nodes?
    Voting Booth?
    Which type of climate do you prefer to live in?

    Results (59 votes). Check out past polls.