Re: why does open()ing happen only at the <FD> line ?

On Thu, Jan 10, 2002 at 06:54:25PM +0000, Prahlad Vaidyanathan wrote:
> <code>
> open(FD,"sudo less /var/log/messages |") ;
> print "test\n" ;
> my $line = <FD> ;
> print "$line\n" ;
> print "test #2\n" ;
> </code>
> 
> $ ./test.pl
> Password:test
>     [waits for password here]
> Jan  6 06:51:13 marvin syslogd 1.4-0: restart.
> 
> test #2
> </output>
> 
> As you can see, it runs 'sudo' _after_ printing "test\n". ie. when it
> reads from the file.

Um, how do you figure?  The sudo program prints out the "Password:" prompt,
and from your output you can clearly see "test" is after "Password:".  So
sudo is being run before "test" is printed.


Michael
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Administrator                      www.shoebox.net
Programmer, System Administrator   www.gallanttech.com
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• why does open()ing happen only at the <FD> line ? by Prahlad Vaidyanathan
• RE: why does open()ing happen only at the <FD> line ? by Bob Showalter
• RE: why does open()ing happen only at the <FD> line ? by Bob Showalter
• Re: why does open()ing happen only at the <FD> line ? by Michael Fowler
• Re: why does open()ing happen only at the <FD> line ? by Prahlad Vaidyanathan
• Re: why does open()ing happen only at the <FD> line ? by Michael Fowler
• Re: why does open()ing happen only at the <FD> line ? by Prahlad Vaidyanathan
• Re: why does open()ing happen only at the <FD> line ? by Michael Fowler