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Re^3: Detecting if a program or file exists

by mattk (Pilgrim)
on Oct 18, 2005 at 05:19 UTC ( #500882=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Detecting if a program or file exists
in thread Detecting if a program or file exists

What about if I want to make sure a module (Win32::DirSize) is installed?

# see perldoc -f require for more info my $class = 'Win32::DirSize'; eval "require $class" or die "Couldn't load $class: $@";
And what about another program that only has one executable file?
my $binary = "/path/to/executable"; -x $binary or die "$binary not found";


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Re^4: Detecting if a program or file exists
by blazar (Canon) on Oct 18, 2005 at 07:06 UTC
    And what about another program that only has one executable file?
    my $binary = "/path/to/executable"; -x $binary or die "$binary not found";
    FM seems to be under Windows, since he asks about Win32::DirSize. But I guess -x is *NIX-centric and I don't know how it would behave under redmondish environments. Maybe it would just evaporate silently to -f, but I would probably use directly the latter:
    -f or die "`$_' binary not found\n" for 'C:/path/to/executable';
Re^4: Detecting if a program or file exists
by ChrisS (Monk) on Oct 18, 2005 at 13:38 UTC
    You might be able to determine if a module is installed without explicitly requiring or using it by using a technique I described in Re: Case Insensitivity on Windows.
Re^4: Detecting if a program or file exists
by FM (Acolyte) on Oct 18, 2005 at 18:01 UTC
    Thanks a bunch.
    It worked as expected, however, the -x did not work and I finally use -e. How is this going to affect what I am trying to do? Thanks, FM
      FM,
      Take a look at perldoc -f -X. The difference between -e (exists) and -x (executable by effective UID/GID) may be a big one. Before I go any further - what do you mean -x didn't work? What happens when you try to run it? What's the output? What's the error message? Saying "it doesn't work" isn't very helpful.

      Cheers - L~R

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