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Re: Perplexing message on command line.

by dasgar (Curate)
on Apr 23, 2013 at 16:36 UTC ( #1030191=note: print w/replies, xml ) Need Help??


in reply to Perplexing message on command line.

I removed Cygwin several months ago...

It's been several years since I last tried to uninstall/remove Cygwin from a system. At that time, the only way that I could completely and cleanly remove Cygwin was to re-install the OS. Otherwise, I would always seem to find some bits and pieces of Cygwin still on the system. Perhaps they have a better uninstaller now. Anyways, just thought I'd share this in case you might still have some parts of Cygwin hanging around.

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[shmem]: Lady_Aleena, in the first example grep evaluates the result from grep and if true, returns $_. In the second, it always returns $_
[shmem]: ..the result from the pattern match
[Lady_Aleena]: tobyink, I did after I failed to get the BLOCK to work. I can't seem to get my brain around grep BLOCK, though I'm okay with grep EXPR.
[shmem]: so in the second example grep returns all true elements of the list passed
[Lady_Aleena]: Okay, so grep BLOCK is not like map BLOCK where something might need to be returned at the end.
[tobyink]: grep { $_ =~ /.*$in.*/; } @my_modules should work just fine. The problem is that you were adding on ;$_ at the end of the block. Why were you doing that?
[Lady_Aleena]: tobyink, I was thinking map.
[tobyink]: Something does need to be returned at the end not $_ though. You need to return (something that will be evaluated as) a boolean.
[Lady_Aleena]: Here is a longish map I did in the same script. my @my_modules = map { my $file = $_; $file =~ s/$module_director y(.+)\.pm/$1/; $file =~ s/\//::/g; $file; } @files;
[Lady_Aleena]: I spent half an hour trying to figure out why map was rewriting @files.

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