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Why does Perl let me delete read-only files? Why does -i clobber protected files? Isn't this a bug in Perl?

by faq_monk (Initiate)
on Oct 13, 1999 at 03:42 UTC ( #819=perlfaq nodetype: print w/replies, xml ) Need Help??

Current Perl documentation can be found at perldoc.perl.org.

Here is our local, out-dated (pre-5.6) version:

This is elaborately and painstakingly described in the ``Far More Than You Ever Wanted To Know'' in http://www.perl.com/CPAN/doc/FMTEYEWTK/file-dir-perms .

The executive summary: learn how your filesystem works. The permissions on a file say what can happen to the data in that file. The permissions on a directory say what can happen to the list of files in that directory. If you delete a file, you're removing its name from the directory (so the operation depends on the permissions of the directory, not of the file). If you try to write to the file, the permissions of the file govern whether you're allowed to.

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[Corion]: Heh. Perl heredocs are nasty - Filter::Simple doesn't know whether the line continued after the heredoc or not. The heredoc payload starts on the next line.
[Corion]: So currently, Filter::Simple mangles your code/line numbers if you use heredocs ;)
[Corion]: Of course, from a certain angle, it doesn't matter if your code line continues after <<FOO, but it would be nice if Filter::Simple / Text::Balanced didn't mangle that...

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