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Re: System vs. User module version of List::Util

by sundialsvc4 (Abbot)
on Jun 19, 2017 at 13:49 UTC ( #1193095=note: print w/replies, xml ) Need Help??

in reply to System vs. User module version of List::Util

A few idle comments here:

The Unix locate command will only function if the updatedb command is being periodically run to update its database, a-n-d if the file is in a place that is being indexed by it.   (For instance, NFS shares usually are not.)   Windows systems do not have an equivalent.

Libraries will always be searched in the order specified by @INC, which can be managed in any one of several ways (such as use lib).   But some installation scripts, which are run when you install a package for the first time, also perform these tests and may be confused by things being found in un-conventional locations.   If the test is only a warning, you can proceed.   But occasionally, you must “force” installation of the module to override the tests.   This is your judgment call.   (The OP did not provide details as to exactly when the conflict-message occurred.)

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Re^2: System vs. User module version of List::Util
by marto (Bishop) on Jun 19, 2017 at 14:04 UTC
      "Windows systems do not have an equivalent." Apart from:
      • dir filename /s from the command prompt.

      Well, as much as I hate it, but that's nonsense:

      locate uses a database (created by the companion program updatedb, see locatedb). That database contains a sorted and compressed list of filenames on the system optimized for searching for filenames.

      dir /s filename (on DOS/Windows) is a stupid tree scanner that has to read at least all directories starting at the current directory. It is roughly equivalent to find . -name filename.

      • powershells get-childitem

      That's also a stupid tree scanner, according to Microsoft

      • gnu find utils

      find is yet another stupid tree scanner. See GNU documentation. Apart from that, findutils contain locate, see above.

      • One of the many ports of locate available...

      Yeah, right. You could use locate on Windows. Like you could use it on Unix. With a database optimized for searching for filenames. Updated every now and then, and not always installed. Especially not installed on any "fresh" Windows installation. It is not even part of the installation media.

      Windows has an indexing service, optional for NT 4, standard since W2k, replaced with Windows Search indexer in Vista. But both index file names AND file contents, so they are not really comparable to locate. Yes, I'm aware that the newer one has a search API, but it looks quite scary. Maybe it's quite easy to implement something that has a command line interface similar to locate, but it is not available out-of-the-box. Plus, neiter the Indexing Service nor Windows Search index all local files. Directories outside Microsoft's plan for where you should store your data are not scanned by default.

      locate's updatedb can be configured by updatedb.conf, that file usually excludes virtual files, temp directories, and files on network shares and removable media. Directories outside the FHS are usually indexed. A sane updatedb.conf is usually bundled with locate when you use a binary or source distribution of Linux, and I'd expect the same for the BSDs.


      Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)

        Not sure if you've followed the thread, locate isn't avaiable. Consider equivelence as in equal in value. OP simply wanted to find files. Some of the alternatives listed are not as 'inteligent' as locate, however they do not rely on a database which may be stale, or may not be indexing, and will work.

        " Apart from that, findutils contain locate, see above."

        I know, that's why I linked to it.

      dir filename /s from the command prompt.

      Or dir /s /b for more program friendly formatting. (Or attrib /s. It requires a little prefix trimming, but seems to run faster on uncached drives or trees.)

      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". The enemy of (IT) success is complexity.
      In the absence of evidence, opinion is indistinguishable from prejudice. Suck that fhit
      Heh. As usual, sundial-servicer's "knowledge" is 30 years old.

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