sorting a directories content

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

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Re: sorting a directories content by GrandFather (Saint) on Apr 12, 2007 at 00:18 UTC
`print join "\n", sort @DirList;` [download] prints sorted by file/dir name. `print join "\n", sort {-M $a <=> -M $b} @DirList;` [download] prints sorted by modification date. DWIM is Perl's answer to Gödel	[reply] [d/l] [select]
Re^2: sorting a directories content by betterworld (Curate) on Apr 13, 2007 at 13:25 UTC
print join "\n", sort {-M $a <=> -M $b} @DirList; This will result in a flood of stat calls. This would be more efficient: `print join "\n", map $_->[0], sort {$a->[1] <=> $b->[1]} map [$_, -M], @DirList;` Plus, one might want to do something if -M returns undef (due to permission problems or broken symlinks). Update: corrected my silly typing errors, thanks to GrandFather	[reply] [d/l]
Re^3: sorting a directories content by GrandFather (Saint) on Apr 13, 2007 at 21:48 UTC
The Schwartzian Transform is indeed most appropriate in this case. However your sort code is a little buggy. OP may have better luck with: `print join "\n", map {"$_->[0]"} sort {$a->[1] <=> $b->[1]} map {[$_, +-M]} @DirList;` [download] Note that the replies to What is "Schwarzian Transform" (aka Schwartzian) contain many useful comments and references pertaining to the Schwartzian Transform too. DWIM is Perl's answer to Gödel	[reply] [d/l]
Re^4: sorting a directories content by ikegami (Patriarch) on Apr 13, 2007 at 22:53 UTC
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Re: sorting a directories content by grinder (Bishop) on Apr 12, 2007 at 12:33 UTC
Side note: don't use `!/^\.\.?$/` to filter out the current and parent directories. A more robust way is to use direct comparisons: `$_ ne '.' and $_ ne '..'` That way you can never be tricked by dodgy files with names like ".\n". • another intruder with the mooring in the heart of the Perl	[reply] [d/l] [select]
Re^2: sorting a directories content by betterworld (Curate) on Apr 13, 2007 at 14:31 UTC
That way you can never be tricked by dodgy files with names like ".\n". You can replace `$` with `\z`, that is also newline-safe.	[reply]
Re: sorting a directories content by aquarium (Curate) on Apr 12, 2007 at 00:12 UTC
you'll need to stat each file to get the information you need (date/time stamps etc) and devise a sort routine. the hardest line to type correctly is: stty erase ^H	[reply]