Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer

Re (tilly) 1: How to preserve the value of STDIN

by tilly (Archbishop)
on Sep 22, 2000 at 03:22 UTC ( #33587=note: print w/replies, xml ) Need Help??

in reply to How to preserve the value of STDIN



use IO::Scalar; my $data; tie *HACK, 'IO::Scalar', \$data; print HACK <STDIN>; tied(*HACK)->setpos(0); *STDIN = *HACK;
Now if you don't destroy anything, reading from STDIN gives you what is already in $data which is what was in STDIN.

The idea was good but apparently copying tied stuff like that does not maintain the tie. (I shoulda known that, sorry.) Try this code instead:

use IO::Scalar; $data = join '', <STDIN>; my $s; tie *STDIN, 'IO::Scalar', \$s; print STDIN $data; tied(*STDIN)->setpos(0);
I tested this by adding
print $data; print <STDIN>;
after it, running it, and typing into it.

My apologies for the initial mistake.

Replies are listed 'Best First'.
(Ovid) RE: Re (tilly) 1: How to preserve the value of STDIN
by Ovid (Cardinal) on Sep 22, 2000 at 03:58 UTC
      I don't understand why it works, this is pure magic

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://33587]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others drinking their drinks and smoking their pipes about the Monastery: (4)
As of 2016-10-22 07:52 GMT
Find Nodes?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?

    Results (293 votes). Check out past polls.