Re: How to know if a perl script is put in the background


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Re: How to know if a perl script is put in the background

by mifflin (Curate)

on Nov 18, 2008 at 20:56 UTC ( #724382=note: print w/replies, xml )

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in reply to How to know if a perl script is put in the background

I think I read in "Perl Best Practices" that using -t is not always accurate. The author (Damian Conway) suggests using something like this...

use IO::Interactive qw(is_interactive);

if ( is_interactive() ) {
    print "Running interactively\n";
}
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Re^2: How to know if a perl script is put in the background (background vs. non-interactive)
by almut (Canon) on Nov 18, 2008 at 21:58 UTC

Looking at the implementation of IO::Interactive, it's essentially -t plus some code to handle *ARGV magicness. In other words, it shares the same problem of possibly producing incorrect results when being (mis)used to test if something is running in the background (e.g. when a script is sent into the background using &, executed from an (interactive) command line):

$ ./724312.pl  
Running interactively

$ stty -tostop  # just in case
$ ./724312.pl &
[1] 13831
$ Running interactively
[1]+  Done                    ./724312.pl
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