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Re: File permission confusion [Debian 9.1 with MATE]

From <tomas@tuxteam.de>
Newsgroups linux.debian.user
Subject Re: File permission confusion [Debian 9.1 with MATE]
Date 2018-01-01 19:40 +0100
Message-ID <v3da9-5YQ-1@gated-at.bofh.it> (permalink)
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On Mon, Jan 01, 2018 at 06:11:59PM -0000, Dan Purgert wrote:

[...]

> Note that "write" permissions on a file only really comes into play when
> you're messing with a file in an editor (e.g. vim, emacs, nano,
> whatever).  It does not necessarily prevent one from doing something
> like:
> 
>    -rw-r----- [...] somefile.txt
>    $ mv anotherfile.txt somefile.txt
> 
> Because you're not modifying "the file", but rather its parent
> directory.  It's a very, very fine distinction, to be sure.

And that's the point... a program "messing" with the file might
well choose to copy the file to some other name, modify that copy,
and then, at the end, remove the original and rename the new
version to the original name: this is actually a common pattern
to achieve some form of "atomicity": when you want either all
the changes "committed to disk" or none (in case of failure).

As long as the basic difference between a file and its "name"
(i.e. the directory entry "pointing" to the file) is not understood,
this fine difference between writing to the file and modifying
(e.g. deleting) the directory entry will seem mysterious.

Otherwise... nice tutorial.

Cheers
- -- t
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File permission confusion [Debian 9.1 with MATE] Richard Owlett <rowlett@cloud85.net> - 2018-01-01 12:30 +0100
  Re: File permission confusion [Debian 9.1 with MATE] Mark Fletcher <mark27q1@gmail.com> - 2018-01-01 12:40 +0100
  [ADDENDUM] File permission confusion [Debian 9.1 with MATE] Richard Owlett <rowlett@cloud85.net> - 2018-01-01 12:40 +0100
    Re: File permission confusion [Debian 9.1 with MATE] "Thomas Schmitt" <scdbackup@gmx.net> - 2018-01-01 13:10 +0100
      Re: File permission confusion [Debian 9.1 with MATE] Richard Owlett <rowlett@cloud85.net> - 2018-01-01 18:00 +0100
        Re: File permission confusion [Debian 9.1 with MATE] Dan Purgert <dan@djph.net> - 2018-01-01 19:30 +0100
          Re: File permission confusion [Debian 9.1 with MATE] <tomas@tuxteam.de> - 2018-01-01 19:40 +0100
            Re: File permission confusion [Debian 9.1 with MATE] Dan Purgert <dan@djph.net> - 2018-01-02 12:10 +0100
        Re: File permission confusion [Debian 9.1 with MATE] "Thomas Schmitt" <scdbackup@gmx.net> - 2018-01-01 19:40 +0100
          Re: File permission confusion [Debian 9.1 with MATE] Richard Owlett <rowlett@cloud85.net> - 2018-01-02 15:10 +0100
        Re: File permission confusion [Debian 9.1 with MATE] Eduardo M KALINOWSKI <eduardo@kalinowski.com.br> - 2018-01-02 13:40 +0100
          Re: File permission confusion [Debian 9.1 with MATE] Richard Owlett <rowlett@cloud85.net> - 2018-01-02 15:20 +0100
            Re: File permission confusion [Debian 9.1 with MATE] "Thomas Schmitt" <scdbackup@gmx.net> - 2018-01-02 16:40 +0100
              Re: File permission confusion [Debian 9.1 with MATE] Brian <ad44@cityscape.co.uk> - 2018-01-02 19:40 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Greg Wooledge <wooledg@eeg.ccf.org> - 2018-01-02 19:40 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Brian <ad44@cityscape.co.uk> - 2018-01-02 19:50 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Richard Owlett <rowlett@cloud85.net> - 2018-01-02 20:40 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Brian <ad44@cityscape.co.uk> - 2018-01-02 21:10 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Curt <curty@free.fr> - 2018-01-02 22:20 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Dan Purgert <dan@djph.net> - 2018-01-02 21:30 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Brian <ad44@cityscape.co.uk> - 2018-01-02 21:50 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Dan Purgert <dan@djph.net> - 2018-01-03 00:20 +0100
                Re: File permission confusion [Debian 9.1 with MATE] "Thomas Schmitt" <scdbackup@gmx.net> - 2018-01-02 21:10 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Brian <ad44@cityscape.co.uk> - 2018-01-02 21:40 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Richard Hector <richard@walnut.gen.nz> - 2018-01-06 06:20 +0100
    Re: [ADDENDUM] File permission confusion [Debian 9.1 with MATE] Brian <ad44@cityscape.co.uk> - 2018-01-01 13:10 +0100
    Re: [ADDENDUM] File permission confusion [Debian 9.1 with MATE] Brian <ad44@cityscape.co.uk> - 2018-01-01 20:40 +0100
  Re: File permission confusion [Debian 9.1 with MATE] David Wright <deblis@lionunicorn.co.uk> - 2018-01-01 17:30 +0100
    Re: File permission confusion [Debian 9.1 with MATE] Richard Owlett <rowlett@cloud85.net> - 2018-01-01 18:30 +0100
      Re: File permission confusion [Debian 9.1 with MATE] Michael Stone <mstone@debian.org> - 2018-01-01 18:40 +0100
        Re: File permission confusion [Debian 9.1 with MATE] Richard Owlett <rowlett@cloud85.net> - 2018-01-01 18:50 +0100
          Re: File permission confusion [Debian 9.1 with MATE] Michael Stone <mstone@debian.org> - 2018-01-01 19:10 +0100
            Re: File permission confusion [Debian 9.1 with MATE] <tomas@tuxteam.de> - 2018-01-01 19:20 +0100
              Re: File permission confusion [Debian 9.1 with MATE] Michael Stone <mstone@debian.org> - 2018-01-01 19:40 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Greg Wooledge <wooledg@eeg.ccf.org> - 2018-01-02 15:30 +0100
                Re: File permission confusion [Debian 9.1 with MATE] Michael Stone <mstone@debian.org> - 2018-01-02 23:50 +0100
          Re: File permission confusion [Debian 9.1 with MATE] <tomas@tuxteam.de> - 2018-01-01 19:20 +0100

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