Re: Using grep and glob to find directories containing file

grep will return the input (eg."dir1", "dir2", "dir3"), if the glob returns true. Perhaps you want map.

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Comment on Re: Using grep and glob to find directories containing file

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Re^2: Using grep and glob to find directories containing file by Anonymous Monk on Feb 03, 2013 at 15:09 UTC
I thought grep will only return the elements of the array for which the first expression is true. Since the first expression glob("$_/f") is only true for 'dir1', it should only return that element of the directory list (even though glob returns 3 files in that directory). The glob finds no elements in the other 2 directories, so it should be undefined which would evaluate as false. I don't understand why the elements of glob("$_/f") returned for the first directory entry seemingly spill over to subsequent directories in the (implicit) grep iteration.	[reply]
Re^3: Using grep and glob to find directories containing file by BrowserUk (Patriarch) on Feb 03, 2013 at 15:35 UTC
Since the first expression glob("$_/f") is only true for 'dir1', it should only return that element of the directory list (even though glob returns 3 files in that directory).* You are missing the fact that grep puts the glob in a scalar context, and that makes it act as an iterator: In scalar context, glob iterates through such filename expansions, returning undef when the list is exhausted. With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday' Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply]


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