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Re: TIMTOWTDI Challenge: Create a filename

by xdg (Monsignor)
on Jan 09, 2009 at 05:13 UTC ( [id://735081]=note: print w/replies, xml ) Need Help??


in reply to TIMTOWTDI Challenge: Create a filename

Assuming a quick-and-dirty temporary filename is desired: 

my $filename = int rand 2**31;

[download]

Or pick a large random number of your choice. Plus if you need to generate the *same* temporary filenames on successive runs, you can set the seed for rand() ahead of time.

Similar in nature, but random alphanumerics, not unlike what File::Temp does internally:

my @chars = ('a' .. 'z', 'A' .. 'Z'); 
my $filename = join("", map { $chars[int rand(0+@chars)] } 0 .. 7);

[download]

-xdg

Code written by xdg and posted on PerlMonks is public domain. It is provided as is with no warranties, express or implied, of any kind. Posted code may not have been tested. Use of posted code is at your own risk.

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Re^2: TIMTOWTDI Challenge: Create a filename
by pobocks (Chaplain) on Jan 11, 2009 at 07:18 UTC

    To fully exploit the marvelous utility of the unix file system naming conventions, how about this?

    my $max_num = 255;
my @chars = ('a' .. 'z', 'A' .. 'Z',0 .. 9, '_'); 
my $filename = join("", map { $chars[int rand(0+@chars)] } 1 .. $max_n
+um);

    [download]

    I don't have the energy right now, but a further helpful revision would be filling in all of the characters Unix allows in filenames. Oh, wait. That would be all of them except null. The mind boggles ;-)

    for(split(" ","tsuJ rehtonA lreP rekcaH")){print reverse . " "}print "\b.\n";
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