Try
do {
$artikelID = &newID;
} until (! -e $ARTIKEL_DIR.$artikelID);
open ($artikelID);
That checks for the existence of the file (-e).
John
-----Original Message-----
From: Martijn van Exel [mailto:[EMAIL PROTECTED]]
Sent: 21 September 2001 16:03
To: [EMAIL PROTECTED]
Subject: checking for existence of a file.
I have a subroutine &newID that constructs a pseudo-random ID on every
invocation. Regularly, a file needs to be created in a directory, say
$ARTIKEL_DIR, using a newly generated ID. Of course, I want to make sure
that the file (the ID) doesn't exist yet. Of course, I could put all IDs
previously generated in a kind of logfile and check that logfile. But
then I thought of this:
do {
$artikelID = &newID;
} until (!`$ARTIKEL_DIR.$artikelID`);
open ($artikelID);
Would that work at all? What I think it should do is: 'Create a fresh
pseudo-random ID, check if a file with that name exists in the directory
specified, if it does, try again, if not, open the (new) file.
Can I do this using the `filename` construction? Could this work? Are
there any security / performance issues?
--
martijn van exel -+- [EMAIL PROTECTED] -+- http://huizen.dds.nl/~mvexel/
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