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How do I get all the permission flags on a file?

( #33944=categorized question: print w/ replies, xml ) Need Help??
Contributed by arturo on Sep 25, 2000 at 23:04 UTC
Q&A  > files


Description:

I want to take $file1 and give it the same permissions as $file2, which may be owned by another user. Perl's stat() function returns the mode, but it's not obvious how to get from the 5-digit decimal number returned to octal values (executing oct($mode) on it doesn't give a sensible value). So, how do you do the conversion?

Answer: How do I get all the permission flags on a file?
contributed by merlyn

You don't need octal, ever. You need a number. That number from stat can be handed over directly. For safety, you may want to bit-and it with 07777, but I don't think there'll be any nonsense anyway.

Answer: How do I get all the permission flags on a file?
contributed by BastardOperator

If merlyn's answer confuses you at all, try this:

sub return_mode { my $mode = shift; my @modelist = (($mode & 7000)>>9, ($mode & 0700)>>6, ($mode & 007 +0)>>3, ($mode &0007)); return join('', @modelist); }
Also, I don't know if you would be concerned with ACL's at all, I'm not sure how you would handle those if you were, just wanted to give you a heads up depending on how detailed you're being.

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