What does the -r do in a perl script?

Sakti has asked for the wisdom of the Perl Monks concerning the following question:

This is pretty basic, but I just found by reviewing some scripts an expression that is something like:

if (! -r $out)  
  {
    #do some stuff inside
  }
[download]

I've been trying to search what the "-r" means before an expression, any ideas?

Comment on What does the -r do in a perl script? Download Code

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Re: What does the -r do in a perl script? by toolic (Bishop) on Jun 07, 2011 at 15:23 UTC
From -r: A file test... -r File is readable by effective uid/gid.	[reply]
Re: What does the -r do in a perl script? by ikegami (Patriarch) on Jun 07, 2011 at 15:23 UTC
-X	[reply]
Re^2: What does the -r do in a perl script? by Sakti (Novice) on Jun 07, 2011 at 15:28 UTC
Thank you both guys!!	[reply]